#### Transcript Master Examination Practice Drill #1 2011

```Master Electricians
Drill 2011 #9
O 1. After all demand factors have been taken
into consideration for an office building, the
demand load is determined to be 90,000
VA. Where the building has a 120/240 volt,
single-phase electrical system, what
MINIMUM size copper conductors with
THHW insulation are required for the
underground service-lateral conductors?
400 kcmil
B. 350 kcmil
C. 300 kcmil
D. 500 kcmil
A.
1.
D
Reference
NEC PG. #
Tbl. 310.15(B)(16)
Single –phase current
154
Formula
I= Power
Volts
I = 90,000VA = 375 amperes
240 volts
*Note – Size 500 kcmil THHW conductors with
an allowable ampacity of 380 amperes should
be selected.
O 2. A commercial building is to be supplied
with a transformer having a 480Y/277 volt,
3-phase primary and a 208Y/120 volt, 3phase secondary. The secondary will have a
balanced computed demand load of 416
amperes per phase. The transformer is
required to have a MINIMUM kVA rating of
_______.
100 kVA
B. 150 kVA
C. 86 kVA
D. 200 kVA
A.
2.
B
Reference
NEC PG. #
3 – phase power
Formula
VA = I x E x 1.732
O VA = 416 amperes x 208 volts x 1.732
O 149,866 VA ÷ 1,000 = 149.8 kVA
O 3. What is the MINIMUM size equipment
bonding jumper allowed for receptacles
connected to a 20-ampere branch circuit in
a critical care area of a hospital?
8 AWG
B. 10 AWG
C. 12 AWG
D. 14 AWG
A.
3.
B
Reference
NEC PG. #
517.19(C)
444
O 4. The branch circuit conductors supplying
one or more units of information technology
equipment shall have an ampacity of NOT
less than ________ of the connected load.
80 percent
B. 100 percent
C. 115 percent
D. 125 percent
A.
4.
D
Reference
NEC PG. #
645.5 (A)
561
O 5. In Class II, Division I hazardous locations,
an approved method of connection of
conduit boxes is __________.
Compression fittings
C. Welding
D. All of these
A.
5.
B
Reference
NEC PG. #
502.10(A)(1)(4)
386
O 6. Where a motor of more than 1 horsepower
has a temperature rise of 50°C indicated on
the nameplate, for the purpose of selecting the
overload device, this device shall be selected to
trip at NO more than ________ of the motor’s
(No exceptions or modifications permitted.)
100 percent
B. 115 percent
C. 125 percent
D. 130 percent
A.
6.
B
Reference
NEC PG. #
430.32(A)(1)
319
O 7. The MINIMUM burial depth for conduit or
cables installed under an airport runway,
concourse or tarmac is ______.
1 ½ feet
B. 2 feet
C. 3 feet
D. 1 foot
A.
7.
A
Reference
NEC PG. #
Tbl. 300.5
138
O 8. Liquidtight flexible metal conduit (LFMC)
is approved for use as an equipment
grounding conductor if it does NOT exceed
_______ in length.
10 feet
B. 12 feet
C. 6 feet
D. 8 feet
A.
8.
C
Reference
NEC PG. #
250.118(6)d.
122
O 9. Conductors supplying more than one (1)
motor shall have an ampacity of NOT less
than ______ of the full-load current rating of
the largest motor in the group and 100% of
the full-load current ratings of all the other
motors in the group.
125 percent
B. 110 percent
C. 150 percent
D. 175 percent
A.
9.
A
Reference
NEC PG. #
430.24(1)&(2)
318
O 10. Determine the MINIMUM size THWN
copper branch-circuit conductors permitted
to supply an ac motor when given the
following related information:
 All terminations are rated for 75°C
 Nameplate current rating is 25 amperes
 15 minute rated motor
 Short-time duty
12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG
A.
10.
B
Reference
NEC PG. #
430.22(E)
Tbl. 430.22(E)
Tbl.310.15(B)(16)
316
317
154
FLC of motor = 25 amperes x 120% = 30 amperes
* NOTE – Size 10 AWG THWN copper conductors with an
allowable ampacity of the 35 amperes should be selected
O 11. When intermediate metal conduit (IMC)
is threaded in the field, a standard cutting
die with a ________ taper per ft. shall be
used.
3/8 in.
B. 1/2 in.
C. 3/4 in.
D. 1 in.
A.
11.
C
Reference
NEC PG. #
342.28
202
O 12. Apply no exceptions and determine the
MAXIMUM standard size nontime-delay fuse
permitted for branch-circuit, short-circuit,
and ground-fault protection for an ac motor
where given the following related
information:
 2 hp – 120 volts, single-phase
 Continuous-duty
 Nameplate current rating – 22 amperes
 No code letter
70 amperes
B. 80 amperes
A.
C. 85 amperes
D. 90 amperes
12.
A
Reference
NEC PG. #
430.6(A)(1)
Tbl. 430.248
240.6(A)
311
337
91
FLC of motor - 24 amperes x 300% = 72 amperes
* NOTE - In this case you must go down to the next standard
size nontime - delay fuse with an ampere rating of 70 amperes
O 13. Which of the following listed is NOT
permitted for sues as both controller and
disconnecting means for a motor?
Inverse time circuit breaker
B. Instantaneous-trip circuit breaker
C. Oil switch
D. Air-break switch
A.
13.
B
Reference
NEC PG. #
430.111(B)(1),(2)&(3)
332
O 14. Under which, if any, of the following
conditions is the neutral conductor to be
counted as a current-carrying conductor?
O I. When it is only carrying the unbalanced
current of a single-phase system
O II. When it is the neutral of a 3-phase wyeconnected system that consists of nonlinear
I only
B. II only
C. Neither I nor II
D. Both I and II
A.
14.
B
Reference
NEC PG. #
310.15(B)(5)(a)&(c)
152
O 15. Ceiling-suspended luminaires or paddle
fans located ______ or more above the
maximum water level of a spa or hot tub
shall NOT require GFCI protection.
10 feet
B. 7 ½ feet
C. 8 feet
D. 12 feet
A.
15.
D
Reference
NEC PG. #
680.43(B)(1)(a)
587
O 16. A junction box to be installed will contain
the following:
 Three – size 6 AWG ungrounded conductors
 Three – size 6 AWG grounded conductors
 One – size 8 AWG equipment grounding




conductor
Three – size 12 AWG ungrounded conductors
Three – size 12 AWG grounded conductors
One – size 12 equipment grounding conductor
Four – internal clamps
O The junction box is required to have a
volume of at LEAST _______.
A.
B.
51.50 cubic inches
53.75 cubic inches
C. 46.50 cubic inches
D. 56.50 cubic inches
16.
A
Reference
NEC PG. #
Tbl. 314.16(B)
314.16(B)(1)&(2)
179
178
Size 6 AWG ungrounded conductors
3 x 5.00 cu. In. =
15.00 cu.in.
Size 6 AWG grounded conductors
3 x 5.00 cu. In. =
15.00 cu.in.
Size 8 AWG grounding conductors
1 x 3.00 cu.in. =
3.00 cu.in.
Size 12 AWG ungrounded conductors
3 x 2.25 cu.in. =
6.75 cu.in.
Size 12 AWG grounded conductors
3 x 2.25 cu.in. =
6.75 cu.in.
Size 12 AWG grounding conductors
Internal clamps
-0-
1 x 5.00 cu.in. =
Total =
5.00 cu.in.
51.50 cu.in.
O 17. Where conductors of size 4 AWG or
larger are installed in conduits entering a
junction box and straight pulls of the
conductors are to be made, the length of the
box shall NOT be less than _______ times
the trade of the largest raceway.
Six
B. Eight
C. Ten
D. Twelve
A.
17.
B
Reference
NEC PG. #
314.28(A)(1)
183
O 18. With respect to service-drop conductors
and open overhead wiring of not more than
750 volts to ground, the MINIMUM vertical
clearance that must be maintained from the
base of a swimming pool diving board and
the conductors is _________.
14 ½ feet
B. 16 ½ feet
C. 20 ½ feet
D. 22 ½ feet
A.
18.
D
Reference
NEC PG. #
680.8(A)
Fig. 680.8
Tbl. 680.8
577
578
578
O 19. The life safety branch of the emergency
system of a health care facility shall provide
power to ______.
O I. automatic doors used for building egress
O II. Illuminate electrical equipment
I only
B. II only
C. Both I and II
D. Neither I nor II
A.
19.
A
Reference
NEC PG. #
517.32(H)
448
O 20. When a building contains _______, the
building may have more than one service
without special permission being granted
from the local authority having jurisdiction.
Exit lights
B. Fire pumps
C. Computers
D. Four-hour rated fire-resistant walls
A.
20.
B
Reference
NEC PG. #
230.2(A)(1)
78
O 21. In general, service-drop conductors shall
have a vertical clearance of at LEAST
_______ above the roof surface of a building
having no overhang.
10 feet
B. 12 feet
C. 14 feet
D. 8 feet
A.
21.
D
Reference
NEC PG. #
230.24(A)
80
O 22. In general, the phase arrangement on
the three-phase busses for a three-phase
panelboard or switchboard shall be A, B, C,
as viewed from __________.
O I. Back to front
O II. Bottom to top
I only
B. II only
C. Neither I nor II
D. Both I and II
A.
22.
C
Reference
NEC PG. #
408.3(E)
274
O 23. Where a conductor is marked RHW-2 on
the insulation what does the -2 represent?
The cable has 2 conductors.
B. The conductor is double insulated
C. The conductor has a nylon outer jacket
D. The conductor has a maximum operating
temperature of 90°C
A.
23.
(D)
Reference
NEC PG. #
Tbl. 310.104(A)
168
O 24. Which of the following listed raceways is
NOT permitted for use of enclosing control
wiring for electric motor-driven fire pumps?
Flexible metal conduit (FMC)
B. Liquidtight flexible metal conduit (LFMC)
C. Liquidtight flexible nonmetallic conduit
(LFNC)
D. Intermediate metal conduit (IMC)
A.
24.
A
Reference
NEC PG. #
695.14(E)
620
O 25. In a hospital, low-voltage equipment that
is frequently in contact with the bodies of
persons, must operate on a voltage of _____
or less or be moisture resistant, double
insulated or approved as intrinsically safe.
10 volts
B. 24 volts
C. 50 volts
D. 120 volts
A.
Question
Reference
NEC PG. #
25.
A
517.65(A)(1),(2)&(3)
455
O 26. A grounding electrode that is the sole
electrode, shall NOT be required to be larger
than size _____ copper conductor.
1/0 AWG
B. 6 AWG
C. 4 AWG
D. 3/0 AWG
A.
26.
B
Reference
NEC PG. #
250.66(A)
115
O 27. For solar photovoltaic systems, locating
the system grounded connection point as
close as practicable to the photovoltaic
source better protects the system from
_________.
Excessive voltage drop
B. Excessive resistance in the grounding
system
C. Voltage surges due to the lighting
D. Voltage surges due to ground-faults
A.
27.
C
Reference
NEC PG. #
690.42,IN
603
O 28, Transformers containing oil or a liquid
that will burn where located in Class I,
Division 1 locations shall be _______.
Enclosed in a fence
B. Installed in vaults only
C. Identified for Class I locations
D. Installed in a fire-resistant room
A.
28.
B
Reference
NEC PG. #
501.100(A)(1)
381
O 29. Where liquidtight flexible metal conduit
(LFMC) is installed in a Class I, Division 2
hazardous location, it shall be permitted to
delete the bonding jumper, where the LFMC
is NOT longer than _______ and the
overcurrent protection in the circuit is limited
to _______ or LESS and the load is not a
6 feet – 20 amperes
B. 10 feet – 10 amperes
C. 6 feet – 10 amperes
D. 6 feet – 15 amperes
A.
29.
C
Reference
NEC PG.
#
501.30(B),Ex.(1)&2
381
O 30. Which one of the following wiring
methods is permitted to be installed in ducts
specifically fabricated for environmental air?
Rigid polyvinyl chloride conduit (PVC)
B. Electrical metallic tubing (EMT)
C. Armored Cable (AC)
D. Nonmetallic sheathed cable (NM)
A.
30.
B
Reference
NEC PG. #
300.22(B)
144
protecting a single phase, 240-volt,
continuous-duty, 5 hp, ac motor with a FLA
rating of 26 amperes and a temperature rise
of 50°C marked on the nameplate, shall be
selected to trip at NOT more than ______.
(Consider the value you select will enable
modification of this value is not necessary)
29.9 amperes
B. 32.2 amperes
C. 33.8 amperes
D. 36.4 amperes
A.
31.
A
Reference
NEC PG. #
430.6(A)(2)
Tbl.430.248
430.32(A)(1)
312
337
319
FLA of motor = 26 amperes x 115% = 29.9 amperes
O 32. In Class II, Division 1 locations, where
pendant mounted luminaires are suspended
by rigid metal conduit (RMC) and a means
for flexibility is not provided, the RMC shall
have a length of NOT more than ________.
12 inches
B. 18 inches
C. 24 inches
D. 30 inches
A.
32.
A
Reference
NEC PG. #
502.130(B)(4)
390
O 33. A commercial kitchen is to have the
following cooking related equipment
installed:
 One – 14 kW range
 One – 5.0 kW water heater
 One – 0.75 kW mixer
 One – 2.5 kW dishwasher
 One – 2.0 kW booster heater
 One – 2.0 kW broiler
O Determine the demand load, in kW, after
applying the demand factors for the kitchen
equipment.
19.00 kW
B. 26.25 kW
A.
C. 18.38 kW
D. 17.06 kW
33.
A
Reference
NEC PG. #
220.56
Tbl.220.56
65
67
14.00 kw – range
5.00 kw - water heater
0.75 kw – mixer
2.50 kw – dishwasher
2.00 kw – booster heater
2.00 kw – broiler
26.25 kw – total connected load x 65% = 17.06
•
•
NOTE – However the NEC ® states the demand shall
not be less than the two largest pieces of equipment.
14.00 kw + 5.00 kw = 19 kw demand
O 34. In a minor repair commercial garage,
any unventilated pit or below-grade work
area is classified as a _______ hazardous
location, where gaseous liquids and fuels
are not transferred.
Class I, Division 2
B. Class II, Division 1
C. Class II, Division 2
D. Class I, Division 1
A.
34.
A
Reference
NEC PG. #
511.3(D)(3)(b)
421
O 35. Where a motor controller enclosure is
located outdoors and is subject to be
exposed to sleet, it shall have a MINIMUM
rating of _______, where the controller
mechanism is required to be operable when
ice covered.
Type 3
B. Type 3S
C. Type 3R
D. Type 3SX
A.
35.
B
Reference
NEC PG. #
Tbl. 110.28
41
O 36. When buried raceways pass under a
commercial driveway or parking lot the
MINIMUM cover requirements ______.
Decrease if installed in rigid metal conduit
(RMC)
B. Do not change in regard to wiring methods
used
C. Shall be increased for direct-buried cables
D. Shall be increased, decreased or remain
the same, depending on the wiring method
used
A.
36.
B
Reference
NEC PG. #
Tbl. 300.5
138
O 37. The National Electrical Code® requires
ventilation of a battery room where batteries
are being charged to prevent ___________.
Battery corrosion
B. Electrostatic charge
C. Deterioration of the building steel
D. An accumulation of an explosive mixture
A.
37.
D
Reference
NEC PG. #
480.9(A)
360
O 38. For other than Design B energy-efficient
motors, where the setting specified in Table
430.52 of the NEC® is not sufficient for the
starting current of the motor, the setting of
an instantaneous trip circuit breaker shall
be permitted to be increase3d, but in NO
case exceed ________ of the full-load
current of the motor.
1300 percent
B. 1700 percent
C. 1100 percent
D. 800 percent
A.
38.
A
Reference
NEC PG. #
430.52(C)(3), Ex.1
323
O 39. Where given the following related
information, determine the MAXIMUM standard
size overcurrent protection required for the
primary and secondary side of a transformer,
when primary and secondary overcurrent
protection is to be provided.
 150 kVA rating
 Primary – 480 volt, 3-phase, 3-wire
 Secondary – 208Y/120 volt, 3-phase, 4-
wire
A.
B.
C.
D.
Primary – 500 amperes, Secondary – 500
amperes
Primary – 450 amperes, Secondary – 600
amperes
Primary – 500 amperes, Secondary – 450
amperes
Primary – 450 amperes, Secondary – 500
amperes
39.
B
Reference
NEC PG. #
3 – Phase Current
Formula
450.3(B)
Tbl. 450.3(B)
240.6(A)
348
349
91
(Primary)
I=
VA___ I = __150,000__ = 150,000 = 180 amps x 250% = 450 amps
E x 1.732
480 x 1.732
831.36
(Secondary )
I=
VA___ I = __150,000__ = 150,000 = 416 amps x 250% = 520 amps
E x 1.732
208 x 1.732
36.25
O 40. For capacitors of over 600 volts, a
means shall be provided to reduce the
residual voltage of a capacitor to ________
after the capacitor is disconnected from the
source of supply.
50 volts or less within 1 minute
B. 24 volts or less within 1 minute
C. 50 volts or less within 10 minutes
D. 50 volts or less within 5 minutes
A.
40.
D
Reference
NEC PG. #
460.28(A)
358
O 41. Apply no exceptions and determine the
MAXIMUM standard size time-delay fuses
permitted to be used for branch-circuit,
short-circuit, and ground-fault protection for
a 15 hp, 480-volt, three-phase, continuousduty, wound rotor motor.
35 amperes
B. 40 amperes
C. 50 amperes
D. 55 amperes
A.
41.
A
Reference
NEC PG. #
430.6(A)(1)
Tbl. 430.250
Tbl. 430.52
240.6(A)
311
338
323
91
FLC of motor = 21 amperes x 175% = 36.75 amperes
* NOTE – In this situation you are required to go DOWN to
the next standard size fuses with a rating of 35 amperes
O 42. In general, when conductors of different
insulation rating are installed in a common
raceway and the voltage is 600 colts or less,
the NEC® requires __________.
All conductors shall have an insulation
rating equal to at least the maximum circuit
voltage applied to any conductor on the
raceway
B. The conduit allowable fill to be limited to 31
percent
C. All conductors within the raceway shall have
a temperature rating of 75°C
D. The insulation of the lower rated conductors
to be identified with blue or yellow colors.
A.
42.
A
Reference
NEC PG. #
300.3(C)(1)
136
O 43. Where used outdoors, aluminum
grounding conductors shall NOT be
terminated within _____ of the earth.
18 inches
B. 24 inches
C. 3 feet
D. 6 feet
A.
43.
A
Reference
NEC PG. #
250.64(A)
113
O 44. A 6,000 sq. ft. bank building is to be
constructed and the number of generalpurpose receptacles to be installed in the
building is yet to be determined; the building
will also have an electric sign. Determine the
MINIMUM number of 120-volt, 20-ampere
branch circuits required for the lighting,
receptacles and the sign.
12
B. 13
C. 14
D. 15
A.
44.
D
Reference
NEC PG. #
Art. 100
210.19(A)(1)
Tbl. 220.12
600.5(A)
27
52
63
519
6000 sq. ft. x 3.5 VA = 21,000 VA x 125% = 26,250 VA (lighting )
6000 sq. ft. x 1.0 VA =
6,000 VA (receptacles)
32,250 VA ( recpts. & ltg.)
120 volts x 20 amperes = 2,400 VA of one circuit
32,250 VA (load)/2,400 VA (one circuit) = 13.4 ckts. = 14 circuits
14 circuits ( lighting & receptacles) + 1 sign circuit = 15 circuits total
O 45. Enclosures containing circuit breakers,
switches and motor controllers located in
Class II, Division 2 locations, shall be ______
or otherwise identified for the location.
Gastight
B. Vapor-proof
C. Dust tight
D. Stainless steel
A.
45.
C
Reference
NEC PG. #
502.115(B)
388
O 46. Where installed for a commercial
occupancy, determine the MINIMUM size
THWN copper conductors required from the
terminals of a 3-phase, 480Y/277 volt, 4wire, 200 kW generator to the first
distribution device(s) containing overcurrent
protection, where the design and operation
of the generator does NOT prevent
250 kcmil
B. 300 kcmil
C. 400 kcmil
D. 500 kcmil
A.
46.
B
Reference
NEC PG. #
3 – Phase current
Formula
455.13
Tbl. 310.15(B)(16)
347
154
I = kW x 1,000
I = 200 x 1,000 = 200,00 = 240.56 amperes (FLC)
volts x 1.732
480 x 1.732
831.36
241 amperes x 115% = 277 amperes (required ampacity of conductors)
*NOTE – Size 300 kcmil THWN conductors with an allowable
ampacity of 285 amperes should be selected.
O 47. Where required, conduit seals installed
in Class I Divisions 1 & 2 locations shall
have the minimum thickness of the sealing
compound not less than the trade size of
the sealing fitting and, in NO case less than
_______ thick.
1/2 in.
B. 5/8 in.
C. 3/4 in.
D. 1 in.
A.
47.
B
Reference
NEC PG. #
501.15(C)(3)
379
O 48. A dwelling unit to be built will have
1,400 sq. ft. of livable space on the main
floor, a 1,400 sq. ft. basement (unfinished
but adaptable for future use), a 200 sq. ft.
open porch and a 600 sq. ft. garage.
Determine the MINIMUM number of 15ampere, 120-volt general lighting branchcircuits required for the dwelling.
Four
B. Five
C. Six
D. Seven
A.
48.
B
Reference
NEC PG. #
220.12
Tbl. 220.12
61
63
1,400 sq. ft. + 1,400 sq. ft. = 2,880sq. Ft. x VA = 8,400 VA
120 volts x 15 amperes = 1,800 VA of one circuit
4.6 = 5 circuits total
1,800 VA ( one circuit)
O 49. The optional method of feeder and
service load calculations for dwelling units is
reserved for feeder and service conductors
with a MINIMUM ampacity of ________ or
greater.
400 amperes
B. 200 amperes
C. 150 amperes
D. 100 amperes
A.
49.
D
Reference
NEC PG. #
220.82(A)
67
O 50. In an industrial establishment, what is
the MAXIMUM length of 200 ampere rated
busway that may be tapped to a 600
overcurrent protection?
10 feet
B. 25 feet
C. 50 feet
D. 75 feet
A.
50.
C
Reference
NEC PG. #
368.17(B),Ex.
225
O 51. Thermal insulation is not permitted to be
installed above a recessed luminaire or
WITHIN _____ of the recessed luminaire’s
enclosure, wiring compartment, ballast,
transformer, LED driver or power supply,
unless the luminaire is identified as Type IC
for insulation contact.
3 inches
B. 4 inches
C. 6 inches
D. 8 inches
A.
51.
A
Reference
NEC PG. #
410.116(B)
286
O 52. What is the MINIMUM height allowed for
a fence enclosing an outdoor installation of
2,400 volt electrical equipment?
6 feet
B. 7 feet
C. 8 feet
D. 9 feet
A.
52.
B
Reference
NEC PG. #
110.31
40
O 53. All exposed non-current-carrying metal
parts of an information technology system
shall ______ or shall be double insulated.
Be bonded to the equipment grounding
conductor
B. Not be bonded to the equipment grounding
conductor
C. Be bonded to the grounded conductor
D. Be isolated
A.
53.
A
Reference
NEC PG. #
645.15
562
O 54. Storage batteries used as a source of
power for emergency systems shall be of a
suitable rating and capacity to supply and
maintain the total load for at
LEAST________.
1/2 hour
B. 1 hour
C. 1 ½ hour
D. 2 hours
A.
54.
C
Reference
NEC PG. #
700.12(A)
624
O 55. Circuit breakers rated at _____ or less
and 600 volts or less shall have the ampere
rating molded, stamped, etched or similarly
marked into their handles or escutcheon
areas.
600 amperes
B. 200 amperes
C. 400 amperes
D. 100 amperes
A.
55.
D
Reference
NEC PG. #
240.83(B)
96
O 56. What percent of electrical supplied
spaces in a recreational vehicle park must
be equipped with at least one (1) 30-ampere
125-volt receptacle outlet?
75 percent
B. 60 percent
C. 70 percent
D. 100 percent
A.
56.
C
Reference
NEC PG. #
551.71
500
O 57. A straight pull of size 250 kcmil and 350
kcmil conductors is to be made in a junction
box that will have one (1) 3 in. conduit and
two (2) 2 ½ in. conduits entering on the
same side and exiting on the opposite wall.
No splices or terminations will be made in
the box. Which of the following listed
junction boxes is the MINIMUM required for
this installation?
18 in. x 12 in.
B. 20 in. x 18 in.
C. 20 in. x 20 in.
D. 24 in. x 24 in.
A.
57.
D
Reference
NEC PG. #
314.28(A)(1)
183
3 in. (largest conduit) x 8 = 24 in.
O 58. Where conduits enter a floor-standing
switchboard or panelboard at the bottom,
the conduits, including their end fittings,
shall NOT rise more than _______ above the
bottom of the enclosure.
6 inches
B. 3 inches
C. 2 inches
D. 4 inches
A.
58.
B
Reference
NEC PG. #
408.5
275
O 59. A bonding jumper connected between
the communications grounding electrode
and power grounding electrode system at
the building or structure service where
separate electrodes are used shall NOT be
smaller than ______ copper.
8 AWG
B. 6 AWG
C. 12 AWG
D. 10 AWG
A.
59.
B
Reference
NEC PG. #
800.100(D)
674
O 60. Which of the following listed copper
conductors, is the MINIMUM size 75°C
rated conductors required to supply a
continuous-duty, 25 hp, 208-volt, 3-phase
motor, where the motor is on the end of a
short conduit run that contains only three
(3) conductors, at an ambient temperature
of 115°F?
1 AWG THWN
B. 2 AWG THWN
C. 1 AWG THHN
D. 1/0 AWG THWN
A.
Question
Reference
NEC PG. #
60.
A
430.22
Tbl. 430.250
Tbl. 310.15(B)(16)(a)
Tbl. 310.15(B)(16)
316
338
150
154
25 hp motor FLC = 74.8 amperes x 125% = 93.5 amperes
93.5 amperes ÷ .75 (temperature correction) = 124.6 amperes
* NOTE – The wire size needs to be increased because of the
elevated ambient temperature. Size 1 AWG THWN conductors with
allowable ampacity of 130 amperes should be selected
O 61. Single-conductor cable Type ______
shall be permitted in exposed outdoor
locations in photovoltaic source circuits for
photovoltaic module interconnections within
the photovoltaic array.
UF
B. THHN
C. USE-2
D. THWN
A.
61.
C
Reference
NEC PG. #
690.31(B)
601
O 62. For track lighting installed in a retail
store, a MAXIMUM of two (2) feet of lighting
track or fraction thereof shall be considered
______.
150 VA
B. 180 VA
C. 200 VA
D. 100 VA
A.
62.
A
Reference
NEC PG. #
220.43(B)
64
O 63. Where fixed wiring above bulk fuel
storage tanks is installed in PVC conduit, the
PVC shall be Schedule ________.
20
B. 40
C. 80
D. 100
A.
63.
C
Reference
NEC PG. #
515.7(A)
429
O 64. Disregarding exceptions, the MINIMUM
size grounded or undergrounded conductors
permitted to be connected in parallel is
_____.
6 AWG
B. 1 AWG
C. 2 AWG
D. 1/0 AWG
A.
64.
D
Reference
NEC PG. #
310.10(H)(1)
429
O 65. In general, 4 in. wide underfloor
raceways shall have a covering of wood or
concrete of NOT less than _______ above
the raceway.
½ in.
B. ¾ in.
C. 1 in.
D. 1 ¼ in.
A.
65.
B
Reference
NEC PG. #
390.4(A)
238
O 66. Exposed trade size ¾ in. Schedule 40
PVC conduit is required to be securely
supported at intervals NOT to exceed
_______.
3 feet
B. 4 feet
C. 6 feet
D. 8 feet
A.
66.
A
Reference
NEC PG. #
352.30(B)
Tbl. 352.30
209
210
O 67. Receptacles located within the patient
care areas of pediatric wards shall be
______ or shall employ a listed tamperresistant cover.
15 ampere rated
B. Provided with GFCI
C. A single receptacle type
D. Listed tamper-resistant
A.
67.
D
Reference
NEC PG. #
517.18(C)
444
O 68. What is the MAXIMUM length permitted
of a flexible cord that may be used to cordand-plug connect a water circulating pump
motor for a swimming pool at a dwelling?
3 feet
B. 4 feet
C. 6 feet
D. 10 feet
A.
68.
A
Reference
NEC PG. #
680.21(A)(5)
579
O 69. The MAXIMUM height above the floor or
working platform to the center of the
operating handle of a service disconnecting
switch when it is in the ON position must not
exceed ______.
6 feet
B. 6 ft. 6 in.
C. 6 ft. 7 in.
D. 7 feet
A.
69.
C
Reference
NEC PG. #
404.8(A)
267 & 268
O 70. The upward discharging vent of an
underground fuel tank of motor fuel
dispensing facilities is classified as a Class I,
Division 1 location WITHIN ______ of the
open vent.
3 feet
B. 5 feet
C. 6 feet
D. 8 feet
A.
70.
B
Reference
NEC PG. #
Tbl. 514.3(B)(1)
427
O 71. Flexible metallic tubing (FMT) shall NOT
be used in lengths exceeding _______.
5 feet
B. 6 feet
C. 8 feet
D. 10 feet
A.
71.
B
Reference
NEC PG. #
360.12(6)
219
O 72. Unless approved for a higher voltage,
surface nonmetallic raceways are NOT
approved where the voltage is ______ or
more between conductors.
120 volts
B. 150 volts
C. 300 volts
D. 250 volts
A.
72.
C
Reference
NEC PG. #
388.12(3)
237
O 73. What is the MINIMUM permitted sill
height of a transformer vault doorway?
2 inches
B. 8 inches
C. 6 inches
D. 4 inches
A.
73.
D
Reference
NEC PG. #
450.43(B)
354
O 74. PVC conduit used exposed in areas of
physical damage shall be ________.
Type Schedule 80
B. Type Schedule 40
C. Type Schedule 100
D. Prohibited
A.
74.
A
Reference
NEC PG. #
352.10(F),IN
209
O 75. Determine the MAXIMUM setting
permitted for the overload protection for a 7
½ hp, 3-phase, 480 volt, induction-type ac
motor with a full-load current of 15
amperes, an 86% power factor, and a
service factor of 1.00 indicated on the
nameplate. (Assume exceptions and
modifications are not to be applied.)
17.25 amperes
B. 12.65 amperes
C. 18.75 amperes
D. 13.75 amperes
A.
75.
A
Reference
NEC PG. #
430.32(A)(1)
319
Nameplate rating of motor = 15 amperes x 1.15 = 17.25 amperes
O 76. Where a portable generator is used for a
portable optional standby source and is not
considered a separately derived system, the
equipment grounding conductor shall be
bonded to ________.
The generator frame and the grounded
conductor
B. The system grounding electrode
C. A grounding conductor only
D. The grounded conductor
A.
76.
B
Reference
NEC PG. #
702.11(B)
631
O 77. Where track lighting installed in a
continuous row, each individual section of
NOT More than ______ in length shall be
securely supported.
2 feet
B. 4 feet
C. 6 feet
D. 8 feet
A.
77.
B
Reference
NEC PG. #
410.154
289
O 78. A transformer is to be supplied with four
(4) parallel size 500 kcmil conductors per
phase. The conductors will enter the
enclosure on the opposite wall of the
terminals. What is the MINIMUM wirebending space required for the conductors?
10 inches
B. 12 inches
C. 14 inches
D. 16 inches
A.
78.
D
Reference
NEC PG. #
312.6(B)(2)
Tbl.312.6(B)
174
176
O 79. For trade size ¾ in. Type MI cable, the
radius of the inner edge of the bend shall
NOT be less than _______ times the external
diameter of the cable.
Three
B. Four
C. Five
D. Seven
A.
79.
C
Reference
NEC PG. #
332.24(1)
195
O 80. Manhole covers shall be OVER ______ or
otherwise require the use of tools to open.
25 lbs.
B. 50 lbs.
C. 75 lbs.
D. 100 lbs.
A.
80.
D
Reference
NEC PG. #
110.75(D)
45
O 81. Size 4/0 AWG, 75°C aluminum
secondary conductors of a 3-phase, deltawye transformer, shall be protected at NOT
more than _______.
175 amperes
B. 200 amperes
C. The calculated load connected to the
transformer
D. None of these, because secondary
protection is not required for multiphase,
delta-wye transformer secondary
conductors.
A.
81.
B
Reference
NEC PG. #
Tbl. 310.15(B)(16)
240.4(B)(3)
240.6(A)
154
90
91
Size 4/0 AWG AL conductors rated @ 75º C ampacity = 180 amperes
Next standard size OCP is rated 200 apmeres.
*NOTE – Sec. 240.4(F) requires secondary OCP on delta – wye
transformers.
O 82. For the purpose of determining
conductor fill in conduit, a flexible cord or
cable of four (4) conductors shall be treated
as ________ conductor(s).
One
B. Two
C. Three
D. Four
A.
Question
Reference
NEC PG. #
82.
A
Note 9 Chpt. 9 Tbls.
711
O 83. Where the grounding electrode system
of a building or structure consists of three
(3) driven ground rods, the ground rods shall
be spaced NOT less than ______ apart.
4 feet
B. 5 feet
C. 6 feet
D. 8 feet
A.
83.
C
Reference
NEC PG. #
250.53(B)
112
O 84. What is the MAXIMUM size overcurrent
protection device required to protect size 14
AWG copper conductors used for a pump
motor control-circuit that is protected by the
motor branch circuit protection device and
extends beyond the enclosure?
15 amperes
B. 20 amperes
C. 45 amperes
D. 100 amperes
A.
84.
C
Reference
NEC PG. #
430.72(B)(2)
Tbl. 430.72(b)
Col. C
326
327
O 85. What is the MAXIMUM number of size
12 AWG THHN conductors permitted to be
installed in a trade size 3/8 in. flexible metal
conduit (FMC) where the fittings are outside
the FMC?
Five
B. Two
C. Three
D. Four
A.
85.
D
Reference
NEC PG. #
Tbl. 348.22
206
3 + 1 equipment grounding conductor = 4 conductors total
O 86. A 120/240 volt, single-phase feeder of a
retail shopping mall is to supply a
noncontinuous load of 20,000 VA and a
continuous load 16,000 VA. Consider the
overcurrent device protecting the feeder
conductors is not listed for operation at 100
percent of its rating and determine the
MINIMUM size 75°C copper conductors
required for this installation
1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 1 AWG
A.
86.
B
Reference
NEC PG. #
215.2(A)(1)
59
Single – Phase current formula
Tbl. 310.15(B)(16)
154
20,000 VA x 100% = 20,000 VA
16,000 VA x 125% = 20,000 VA
Total
= 40,000 VA
I = power I = 40,000 VA = 166.6 amperes
volts
240 volts
* NOTE – Size 2/0 AWG conductors with an allowable
ampacity of 175 amperes should be selected.
O 87. Apply the optional method of
calculations for dwelling units and
determine the demand load, in kW, on the
ungrounded (line) service-entrance
conductors for the electric ranges, where a
12 unit multifamily dwelling has an 8 kW
range in each apartment.
39.36 kW
B. 30.72 kW
C. 27.00 kW
D. 96.00 kW
A.
87.
A
Reference
NEC PG. #
220.84(C)b.
Tbl. 220.84
69
69
8 kW x 12 units = 96 kW (connected load) x 41% = 39.36 kW
O 88. An indoor installed 100 kVA, dry-type
transformer with a 4,160 volt primary, must
have a clearance of at LEAST _______ from
combustible material unless separated from
the combustible material by a fire-resistant,
heat-insulated barrier.
6 inches
B. 8 inches
C. 10 inches
D. 12 inches
A.
88.
D
Reference
NEC PG. #
450.21(A)
352
O 89. Interior metal water lines located NOT
more than ____ from the point of entrance
to the building shall be permitted to be used
as a conductor to interconnect electrodes
that are part of the grounding electrode
system.
10 feet
B. 8 feet
C. 5 feet
D. 20 feet
A.
89.
C
Reference
NEC PG. #
250.68(C)(1)
116
O 90. The independent support wires used to
support electrical metallic tubing (EMT) and
flexible metal conduit (FMT) above a nonfire-rated ceiling shall be distinguishable
from the ceiling support wires by means of
________.
O I. Color
O II. Tagging
I only
B. II only
C. Either I or II
D. Neither I nor II
A.
90.
C
Reference
NEC PG. #
300.11(2)
141
O 91. Which of the following listed raceways is
approved for use supplying wet-niche
luminaires in a permanently installed
swimming pool?
Galvanized rigid metal conduit (RMC)
B. Polyvinyl chloride conduit (PVC)
C. Flexible nonmetallic conduit (FNC)
D. All of these listed are approved.
A.
91.
B
Reference
NEC PG. #
680.23(B)(2)
581
O 92. Power distribution blocks shall be
permitted to be placed in pull and junction
boxes having a volume over at LEAST _____
for connections of conductors installed in
boxes where the power distribution blocks
do not have uninsulated live parts exposed
within the box, whether or not the box cover
is installed.
30 cu. In.
B. 60 cu. In.
C. 75 cu. In.
D. 100 cu. In.
A.
92.
D
Reference
NEC PG. #
314.28(E)(2)
184
O 93. The circuit disconnecting means for non-
power-limited fire alarm (NPLFA) circuits
shall have ______ colored identification,
shall be accessible only to qualified persons
and shall be identified as “FIRE ALARM
CIRCUIT.”
Red
B. Orange
C. Yellow
D. Blue
A.
93.
A
Reference
NEC PG. #
760.41(B)
652
O 94. A flexible metal conduit (FMC) having a
length of 4 ft. is to supply a panelboard from
a transformer. The FMC will contain three (3)
size 400 kcmil THWN copper conductors
and one (1) size 350 kcmil THWN copper
conductor. In compliance with the NEC®,
what is the MINIMUM trade size FMC
required.
2 ½ in.
B. 3 in.
C. 3 ½ in.
D. 4 in.
A.
94.
C
Reference
NEC PG. #
Annex C, Tbl. C.3
755
O 95. An outside overhead span of 3-phase, 4
wire, 480Y/277 volt conductors are to be
installed between two buildings of a college
campus. The area the conductors cross will
not be subject to truck traffic. The
conductors must have a MINIMUM
clearance of ______ from final grade.
10 feet
B. 12 feet
C. 15 feet
D. 18 feet
A.
95.
B
Reference
NEC PG. #
225.18(2)
72
O 96. Cables over 600 volts and those rated
600 volts or less, are permitted to be
installed in a common cable tray without a
fixed barrier, where the cables over 600
volts are _______.
Type MI
B. Type NM
C. Type CT
D. Type MC
A.
96.
D
Reference
NEC PG. #
392.20(B)(1)
241
O 97. When calculating the total load for a
mobile home park before demand factors
are taken into consideration, each individual
mobile home lot shall be calculated at a
MINIMUM of _________.
15,000 VA
B. 16,000 VA
C. 20,000 VA
D. 24,000 VA
A.
97.
B
Reference
NEC PG. #
550.31(1)
489
O 98. Where a restaurant located in a retail
shopping mall has a main circuit breaker
rated for 400 amperes, the required
bonding jumper to the metal water piping
system is to be at LEAST _______ copper.
6 AWG
B. 2 AWG
C. 3 AWG
D. 4 AWG
A.
98.
C
Reference
NEC PG. #
250.104(A)(2)
Tbl. 250.122
119
125
O 99. In general, on the load side of the point
of grounding of a separately derived system
such as a transformer, a grounded
conductor is NOT permitted to be connected
to ________.
Equipment grounding conductors
B. Normally non-current-carrying metal parts
of equipment
C. The system bonding jumper
D. Any of these
A.
99.
D
Reference
NEC PG. #
250.30(A)
106
O 100. Where one or more receptacle outlets
are provided for the show window lighting in
a retail store, the outlet(s) shall be installed
within at LEAST ________ of the top of the
show window.
12 inches
B. 18 inches
C. 24 inches
D. 30 inches
A.
100.
B
Reference
NEC PG. #
210.62
58
non-timed drill
O 1. After all demand factors have been taken
into consideration for an office building, the
demand load is determined to be 90,000
VA. Where the building has a 120/240 volt,
single-phase electrical system, what
MINIMUM size copper conductors with
THHW insulation are required for the
underground service-lateral conductors?
400 kcmil
B. 350 kcmil
C. 300 kcmil
D. 500 kcmil
A.
1.
D
Reference
NEC PG. #
Tbl. 310.15(B)(16)
Single –phase current
154
Formula
I= Power
Volts
I = 90,000VA = 375 amperes
240 volts
*Note – Size 500 kcmil THHW conductors with
an allowable ampacity of 380 amperes should
be selected.
O 2. A commercial building is to be supplied
with a transformer having a 480Y/277 volt,
3-phase primary and a 208Y/120 volt, 3phase secondary. The secondary will have a
balanced computed demand load of 416
amperes per phase. The transformer is
required to have a MINIMUM kVA rating of
_______.
100 kVA
B. 150 kVA
C. 86 kVA
D. 200 kVA
A.
2.
B
Reference
NEC PG. #
3 – phase power
Formula
VA = I x E x 1.732
O VA = 416 amperes x 208 volts x 1.732
O 149,866 VA ÷ 1,000 = 149.8 kVA
O 3. What is the MINIMUM size equipment
bonding jumper allowed for receptacles
connected to a 20-ampere branch circuit in
a critical care area of a hospital?
8 AWG
B. 10 AWG
C. 12 AWG
D. 14 AWG
A.
3.
B
Reference
NEC PG. #
517.19(C)
444
O 4. The branch circuit conductors supplying
one or more units of information technology
equipment shall have an ampacity of NOT
less than ________ of the connected load.
80 percent
B. 100 percent
C. 115 percent
D. 125 percent
A.
4.
D
Reference
NEC PG. #
645.5 (A)
561
O 5. In Class II, Division I hazardous locations,
an approved method of connection of
conduit boxes is __________.
Compression fittings
C. Welding
D. All of these
A.
5.
B
Reference
NEC PG. #
502.10(A)(1)(4)
386
O 6. Where a motor of more than 1 horsepower
has a temperature rise of 50°C indicated on
the nameplate, for the purpose of selecting the
overload device, this device shall be selected to
trip at NO more than ________ of the motor’s
(No exceptions or modifications permitted.)
100 percent
B. 115 percent
C. 125 percent
D. 130 percent
A.
6.
B
Reference
NEC PG. #
430.32(A)(1)
319
O 7. The MINIMUM burial depth for conduit or
cables installed under an airport runway,
concourse or tarmac is ______.
1 ½ feet
B. 2 feet
C. 3 feet
D. 1 foot
A.
7.
A
Reference
NEC PG. #
Tbl. 300.5
138
O 8. Liquidtight flexible metal conduit (LFMC)
is approved for use as an equipment
grounding conductor if it does NOT exceed
_______ in length.
10 feet
B. 12 feet
C. 6 feet
D. 8 feet
A.
8.
C
Reference
NEC PG. #
250.118(6)d.
122
O 9. Conductors supplying more than one (1)
motor shall have an ampacity of NOT less
than ______ of the full-load current rating of
the largest motor in the group and 100% of
the full-load current ratings of all the other
motors in the group.
125 percent
B. 110 percent
C. 150 percent
D. 175 percent
A.
9.
A
Reference
NEC PG. #
430.24(1)&(2)
318
O 10. Determine the MINIMUM size THWN
copper branch-circuit conductors permitted
to supply an ac motor when given the
following related information:
 All terminations are rated for 75°C
 Nameplate current rating is 25 amperes
 15 minute rated motor
 Short-time duty
12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG
A.
10.
B
Reference
NEC PG. #
430.22(E)
Tbl. 430.22(E)
Tbl.310.15(B)(16)
316
317
154
FLC of motor = 25 amperes x 120% = 30 amperes
* NOTE – Size 10 AWG THWN copper conductors with an
allowable ampacity of the 35 amperes should be selected
O 11. When intermediate metal conduit (IMC)
is threaded in the field, a standard cutting
die with a ________ taper per ft. shall be
used.
3/8 in.
B. 1/2 in.
C. 3/4 in.
D. 1 in.
A.
11.
C
Reference
NEC PG. #
342.28
202
O 12. Apply no exceptions and determine the
MAXIMUM standard size nontime-delay fuse
permitted for branch-circuit, short-circuit,
and ground-fault protection for an ac motor
where given the following related
information:
 2 hp – 120 volts, single-phase
 Continuous-duty
 Nameplate current rating – 22 amperes
 No code letter
70 amperes
B. 80 amperes
A.
C. 85 amperes
D. 90 amperes
12.
A
Reference
NEC PG. #
430.6(A)(1)
Tbl. 430.248
240.6(A)
311
337
91
FLC of motor - 24 amperes x 300% = 72 amperes
* NOTE - In this case you must go down to the next standard
size nontime - delay fuse with an ampere rating of 70 amperes
O 13. Which of the following listed is NOT
permitted for sues as both controller and
disconnecting means for a motor?
Inverse time circuit breaker
B. Instantaneous-trip circuit breaker
C. Oil switch
D. Air-break switch
A.
13.
B
Reference
NEC PG. #
430.111(B)(1),(2)&(3)
332
O 14. Under which, if any, of the following
conditions is the neutral conductor to be
counted as a current-carrying conductor?
O I. When it is only carrying the unbalanced
current of a single-phase system
O II. When it is the neutral of a 3-phase wyeconnected system that consists of nonlinear
I only
B. II only
C. Neither I nor II
D. Both I and II
A.
14.
B
Reference
NEC PG. #
310.15(B)(5)(a)&(c)
152
O 15. Ceiling-suspended luminaires or paddle
fans located ______ or more above the
maximum water level of a spa or hot tub
shall NOT require GFCI protection.
10 feet
B. 7 ½ feet
C. 8 feet
D. 12 feet
A.
15.
D
Reference
NEC PG. #
680.43(B)(1)(a)
587
O 16. A junction box to be installed will contain
the following:
 Three – size 6 AWG ungrounded conductors
 Three – size 6 AWG grounded conductors
 One – size 8 AWG equipment grounding




conductor
Three – size 12 AWG ungrounded conductors
Three – size 12 AWG grounded conductors
One – size 12 equipment grounding conductor
Four – internal clamps
O The junction box is required to have a
volume of at LEAST _______.
A.
B.
51.50 cubic inches
53.75 cubic inches
C. 46.50 cubic inches
D. 56.50 cubic inches
16.
A
Reference
NEC PG. #
Tbl. 314.16(B)
314.16(B)(1)&(2)
179
178
Size 6 AWG ungrounded conductors
3 x 5.00 cu. In. =
15.00 cu.in.
Size 6 AWG grounded conductors
3 x 5.00 cu. In. =
15.00 cu.in.
Size 8 AWG grounding conductors
1 x 3.00 cu.in. =
3.00 cu.in.
Size 12 AWG ungrounded conductors
3 x 2.25 cu.in. =
6.75 cu.in.
Size 12 AWG grounded conductors
3 x 2.25 cu.in. =
6.75 cu.in.
Size 12 AWG grounding conductors
Internal clamps
-0-
1 x 5.00 cu.in. =
Total =
5.00 cu.in.
51.50 cu.in.
O 17. Where conductors of size 4 AWG or
larger are installed in conduits entering a
junction box and straight pulls of the
conductors are to be made, the length of the
box shall NOT be less than _______ times
the trade of the largest raceway.
Six
B. Eight
C. Ten
D. Twelve
A.
17.
B
Reference
NEC PG. #
314.28(A)(1)
183
O 18. With respect to service-drop conductors
and open overhead wiring of not more than
750 volts to ground, the MINIMUM vertical
clearance that must be maintained from the
base of a swimming pool diving board and
the conductors is _________.
14 ½ feet
B. 16 ½ feet
C. 20 ½ feet
D. 22 ½ feet
A.
18.
D
Reference
NEC PG. #
680.8(A)
Fig. 680.8
Tbl. 680.8
577
578
578
O 19. The life safety branch of the emergency
system of a health care facility shall provide
power to ______.
O I. automatic doors used for building egress
O II. Illuminate electrical equipment
I only
B. II only
C. Both I and II
D. Neither I nor II
A.
19.
A
Reference
NEC PG. #
517.32(H)
448
O 20. When a building contains _______, the
building may have more than one service
without special permission being granted
from the local authority having jurisdiction.
Exit lights
B. Fire pumps
C. Computers
D. Four-hour rated fire-resistant walls
A.
20.
B
Reference
NEC PG. #
230.2(A)(1)
78
O 21. In general, service-drop conductors shall
have a vertical clearance of at LEAST
_______ above the roof surface of a building
having no overhang.
10 feet
B. 12 feet
C. 14 feet
D. 8 feet
A.
21.
D
Reference
NEC PG. #
230.24(A)
80
O 22. In general, the phase arrangement on
the three-phase busses for a three-phase
panelboard or switchboard shall be A, B, C,
as viewed from __________.
O I. Back to front
O II. Bottom to top
I only
B. II only
C. Neither I nor II
D. Both I and II
A.
22.
C
Reference
NEC PG. #
408.3(E)
274
O 23. Where a conductor is marked RHW-2 on
the insulation what does the -2 represent?
The cable has 2 conductors.
B. The conductor is double insulated
C. The conductor has a nylon outer jacket
D. The conductor has a maximum operating
temperature of 90°C
A.
23.
(D)
Reference
NEC PG. #
Tbl. 310.104(A)
168
O 24. Which of the following listed raceways is
NOT permitted for use of enclosing control
wiring for electric motor-driven fire pumps?
Flexible metal conduit (FMC)
B. Liquidtight flexible metal conduit (LFMC)
C. Liquidtight flexible nonmetallic conduit
(LFNC)
D. Intermediate metal conduit (IMC)
A.
24.
A
Reference
NEC PG. #
695.14(E)
620
O 25. In a hospital, low-voltage equipment that
is frequently in contact with the bodies of
persons, must operate on a voltage of _____
or less or be moisture resistant, double
insulated or approved as intrinsically safe.
10 volts
B. 24 volts
C. 50 volts
D. 120 volts
A.
Question
Reference
NEC PG. #
25.
A
517.65(A)(1),(2)&(3)
455
O 26. A grounding electrode that is the sole
electrode, shall NOT be required to be larger
than size _____ copper conductor.
1/0 AWG
B. 6 AWG
C. 4 AWG
D. 3/0 AWG
A.
26.
B
Reference
NEC PG. #
250.66(A)
115
O 27. For solar photovoltaic systems, locating
the system grounded connection point as
close as practicable to the photovoltaic
source better protects the system from
_________.
Excessive voltage drop
B. Excessive resistance in the grounding
system
C. Voltage surges due to the lighting
D. Voltage surges due to ground-faults
A.
27.
C
Reference
NEC PG. #
690.42,IN
603
O 28, Transformers containing oil or a liquid
that will burn where located in Class I,
Division 1 locations shall be _______.
Enclosed in a fence
B. Installed in vaults only
C. Identified for Class I locations
D. Installed in a fire-resistant room
A.
28.
B
Reference
NEC PG. #
501.100(A)(1)
381
O 29. Where liquidtight flexible metal conduit
(LFMC) is installed in a Class I, Division 2
hazardous location, it shall be permitted to
delete the bonding jumper, where the LFMC
is NOT longer than _______ and the
overcurrent protection in the circuit is limited
to _______ or LESS and the load is not a
6 feet – 20 amperes
B. 10 feet – 10 amperes
C. 6 feet – 10 amperes
D. 6 feet – 15 amperes
A.
29.
C
Reference
NEC PG.
#
501.30(B),Ex.(1)&2
381
O 30. Which one of the following wiring
methods is permitted to be installed in ducts
specifically fabricated for environmental air?
Rigid polyvinyl chloride conduit (PVC)
B. Electrical metallic tubing (EMT)
C. Armored Cable (AC)
D. Nonmetallic sheathed cable (NM)
A.
30.
B
Reference
NEC PG. #
300.22(B)
144
protecting a single phase, 240-volt,
continuous-duty, 5 hp, ac motor with a FLA
rating of 26 amperes and a temperature rise
of 50°C marked on the nameplate, shall be
selected to trip at NOT more than ______.
(Consider the value you select will enable
modification of this value is not necessary)
29.9 amperes
B. 32.2 amperes
C. 33.8 amperes
D. 36.4 amperes
A.
31.
A
Reference
NEC PG. #
430.6(A)(2)
Tbl.430.248
430.32(A)(1)
312
337
319
FLA of motor = 26 amperes x 115% = 29.9 amperes
O 32. In Class II, Division 1 locations, where
pendant mounted luminaires are suspended
by rigid metal conduit (RMC) and a means
for flexibility is not provided, the RMC shall
have a length of NOT more than ________.
12 inches
B. 18 inches
C. 24 inches
D. 30 inches
A.
32.
A
Reference
NEC PG. #
502.130(B)(4)
390
O 33. A commercial kitchen is to have the
following cooking related equipment
installed:
 One – 14 kW range
 One – 5.0 kW water heater
 One – 0.75 kW mixer
 One – 2.5 kW dishwasher
 One – 2.0 kW booster heater
 One – 2.0 kW broiler
O Determine the demand load, in kW, after
applying the demand factors for the kitchen
equipment.
19.00 kW
B. 26.25 kW
A.
C. 18.38 kW
D. 17.06 kW
33.
A
Reference
NEC PG. #
220.56
Tbl.220.56
65
67
14.00 kw – range
5.00 kw - water heater
0.75 kw – mixer
2.50 kw – dishwasher
2.00 kw – booster heater
2.00 kw – broiler
26.25 kw – total connected load x 65% = 17.06
•
•
NOTE – However the NEC ® states the demand shall
not be less than the two largest pieces of equipment.
14.00 kw + 5.00 kw = 19 kw demand
O 34. In a minor repair commercial garage,
any unventilated pit or below-grade work
area is classified as a _______ hazardous
location, where gaseous liquids and fuels
are not transferred.
Class I, Division 2
B. Class II, Division 1
C. Class II, Division 2
D. Class I, Division 1
A.
34.
A
Reference
NEC PG. #
511.3(D)(3)(b)
421
O 35. Where a motor controller enclosure is
located outdoors and is subject to be
exposed to sleet, it shall have a MINIMUM
rating of _______, where the controller
mechanism is required to be operable when
ice covered.
Type 3
B. Type 3S
C. Type 3R
D. Type 3SX
A.
35.
B
Reference
NEC PG. #
Tbl. 110.28
41
O 36. When buried raceways pass under a
commercial driveway or parking lot the
MINIMUM cover requirements ______.
Decrease if installed in rigid metal conduit
(RMC)
B. Do not change in regard to wiring methods
used
C. Shall be increased for direct-buried cables
D. Shall be increased, decreased or remain
the same, depending on the wiring method
used
A.
36.
B
Reference
NEC PG. #
Tbl. 300.5
138
O 37. The National Electrical Code® requires
ventilation of a battery room where batteries
are being charged to prevent ___________.
Battery corrosion
B. Electrostatic charge
C. Deterioration of the building steel
D. An accumulation of an explosive mixture
A.
37.
D
Reference
NEC PG. #
480.9(A)
360
O 38. For other than Design B energy-efficient
motors, where the setting specified in Table
430.52 of the NEC® is not sufficient for the
starting current of the motor, the setting of
an instantaneous trip circuit breaker shall
be permitted to be increase3d, but in NO
case exceed ________ of the full-load
current of the motor.
1300 percent
B. 1700 percent
C. 1100 percent
D. 800 percent
A.
38.
A
Reference
NEC PG. #
430.52(C)(3), Ex.1
323
O 39. Where given the following related
information, determine the MAXIMUM standard
size overcurrent protection required for the
primary and secondary side of a transformer,
when primary and secondary overcurrent
protection is to be provided.
 150 kVA rating
 Primary – 480 volt, 3-phase, 3-wire
 Secondary – 208Y/120 volt, 3-phase, 4-
wire
A.
B.
C.
D.
Primary – 500 amperes, Secondary – 500
amperes
Primary – 450 amperes, Secondary – 600
amperes
Primary – 500 amperes, Secondary – 450
amperes
Primary – 450 amperes, Secondary – 500
amperes
39.
B
Reference
NEC PG. #
3 – Phase Current
Formula
450.3(B)
Tbl. 450.3(B)
240.6(A)
348
349
91
(Primary)
I=
VA___ I = __150,000__ = 150,000 = 180 amps x 250% = 450 amps
E x 1.732
480 x 1.732
831.36
(Secondary )
I=
VA___ I = __150,000__ = 150,000 = 416 amps x 250% = 520 amps
E x 1.732
208 x 1.732
36.25
O 40. For capacitors of over 600 volts, a
means shall be provided to reduce the
residual voltage of a capacitor to ________
after the capacitor is disconnected from the
source of supply.
50 volts or less within 1 minute
B. 24 volts or less within 1 minute
C. 50 volts or less within 10 minutes
D. 50 volts or less within 5 minutes
A.
40.
D
Reference
NEC PG. #
460.28(A)
358
O 41. Apply no exceptions and determine the
MAXIMUM standard size time-delay fuses
permitted to be used for branch-circuit,
short-circuit, and ground-fault protection for
a 15 hp, 480-volt, three-phase, continuousduty, wound rotor motor.
35 amperes
B. 40 amperes
C. 50 amperes
D. 55 amperes
A.
41.
A
Reference
NEC PG. #
430.6(A)(1)
Tbl. 430.250
Tbl. 430.52
240.6(A)
311
338
323
91
FLC of motor = 21 amperes x 175% = 36.75 amperes
* NOTE – In this situation you are required to go DOWN to
the next standard size fuses with a rating of 35 amperes
O 42. In general, when conductors of different
insulation rating are installed in a common
raceway and the voltage is 600 colts or less,
the NEC® requires __________.
All conductors shall have an insulation
rating equal to at least the maximum circuit
voltage applied to any conductor on the
raceway
B. The conduit allowable fill to be limited to 31
percent
C. All conductors within the raceway shall have
a temperature rating of 75°C
D. The insulation of the lower rated conductors
to be identified with blue or yellow colors.
A.
42.
A
Reference
NEC PG. #
300.3(C)(1)
136
O 43. Where used outdoors, aluminum
grounding conductors shall NOT be
terminated within _____ of the earth.
18 inches
B. 24 inches
C. 3 feet
D. 6 feet
A.
43.
A
Reference
NEC PG. #
250.64(A)
113
O 44. A 6,000 sq. ft. bank building is to be
constructed and the number of generalpurpose receptacles to be installed in the
building is yet to be determined; the building
will also have an electric sign. Determine the
MINIMUM number of 120-volt, 20-ampere
branch circuits required for the lighting,
receptacles and the sign.
12
B. 13
C. 14
D. 15
A.
44.
D
Reference
NEC PG. #
Art. 100
210.19(A)(1)
Tbl. 220.12
600.5(A)
27
52
63
519
6000 sq. ft. x 3.5 VA = 21,000 VA x 125% = 26,250 VA (lighting )
6000 sq. ft. x 1.0 VA =
6,000 VA (receptacles)
32,250 VA ( recpts. & ltg.)
120 volts x 20 amperes = 2,400 VA of one circuit
32,250 VA (load)/2,400 VA (one circuit) = 13.4 ckts. = 14 circuits
14 circuits ( lighting & receptacles) + 1 sign circuit = 15 circuits total
O 45. Enclosures containing circuit breakers,
switches and motor controllers located in
Class II, Division 2 locations, shall be ______
or otherwise identified for the location.
Gastight
B. Vapor-proof
C. Dust tight
D. Stainless steel
A.
45.
C
Reference
NEC PG. #
502.115(B)
388
O 46. Where installed for a commercial
occupancy, determine the MINIMUM size
THWN copper conductors required from the
terminals of a 3-phase, 480Y/277 volt, 4wire, 200 kW generator to the first
distribution device(s) containing overcurrent
protection, where the design and operation
of the generator does NOT prevent
250 kcmil
B. 300 kcmil
C. 400 kcmil
D. 500 kcmil
A.
46.
B
Reference
NEC PG. #
3 – Phase current
Formula
455.13
Tbl. 310.15(B)(16)
347
154
I = kW x 1,000
I = 200 x 1,000 = 200,00 = 240.56 amperes (FLC)
volts x 1.732
480 x 1.732
831.36
241 amperes x 115% = 277 amperes (required ampacity of conductors)
*NOTE – Size 300 kcmil THWN conductors with an allowable
ampacity of 285 amperes should be selected.
O 47. Where required, conduit seals installed
in Class I Divisions 1 & 2 locations shall
have the minimum thickness of the sealing
compound not less than the trade size of
the sealing fitting and, in NO case less than
_______ thick.
1/2 in.
B. 5/8 in.
C. 3/4 in.
D. 1 in.
A.
47.
B
Reference
NEC PG. #
501.15(C)(3)
379
O 48. A dwelling unit to be built will have
1,400 sq. ft. of livable space on the main
floor, a 1,400 sq. ft. basement (unfinished
but adaptable for future use), a 200 sq. ft.
open porch and a 600 sq. ft. garage.
Determine the MINIMUM number of 15ampere, 120-volt general lighting branchcircuits required for the dwelling.
Four
B. Five
C. Six
D. Seven
A.
48.
B
Reference
NEC PG. #
220.12
Tbl. 220.12
61
63
1,400 sq. ft. + 1,400 sq. ft. = 2,880sq. Ft. x VA = 8,400 VA
120 volts x 15 amperes = 1,800 VA of one circuit
4.6 = 5 circuits total
1,800 VA ( one circuit)
O 49. The optional method of feeder and
service load calculations for dwelling units is
reserved for feeder and service conductors
with a MINIMUM ampacity of ________ or
greater.
400 amperes
B. 200 amperes
C. 150 amperes
D. 100 amperes
A.
49.
D
Reference
NEC PG. #
220.82(A)
67
O 50. In an industrial establishment, what is
the MAXIMUM length of 200 ampere rated
busway that may be tapped to a 600
overcurrent protection?
10 feet
B. 25 feet
C. 50 feet
D. 75 feet
A.
50.
C
Reference
NEC PG. #
368.17(B),Ex.
225
O 51. Thermal insulation is not permitted to be
installed above a recessed luminaire or
WITHIN _____ of the recessed luminaire’s
enclosure, wiring compartment, ballast,
transformer, LED driver or power supply,
unless the luminaire is identified as Type IC
for insulation contact.
3 inches
B. 4 inches
C. 6 inches
D. 8 inches
A.
51.
A
Reference
NEC PG. #
410.116(B)
286
O 52. What is the MINIMUM height allowed for
a fence enclosing an outdoor installation of
2,400 volt electrical equipment?
6 feet
B. 7 feet
C. 8 feet
D. 9 feet
A.
52.
B
Reference
NEC PG. #
110.31
40
O 53. All exposed non-current-carrying metal
parts of an information technology system
shall ______ or shall be double insulated.
Be bonded to the equipment grounding
conductor
B. Not be bonded to the equipment grounding
conductor
C. Be bonded to the grounded conductor
D. Be isolated
A.
53.
A
Reference
NEC PG. #
645.15
562
O 54. Storage batteries used as a source of
power for emergency systems shall be of a
suitable rating and capacity to supply and
maintain the total load for at
LEAST________.
1/2 hour
B. 1 hour
C. 1 ½ hour
D. 2 hours
A.
54.
C
Reference
NEC PG. #
700.12(A)
624
O 55. Circuit breakers rated at _____ or less
and 600 volts or less shall have the ampere
rating molded, stamped, etched or similarly
marked into their handles or escutcheon
areas.
600 amperes
B. 200 amperes
C. 400 amperes
D. 100 amperes
A.
55.
D
Reference
NEC PG. #
240.83(B)
96
O 56. What percent of electrical supplied
spaces in a recreational vehicle park must
be equipped with at least one (1) 30-ampere
125-volt receptacle outlet?
75 percent
B. 60 percent
C. 70 percent
D. 100 percent
A.
56.
C
Reference
NEC PG. #
551.71
500
O 57. A straight pull of size 250 kcmil and 350
kcmil conductors is to be made in a junction
box that will have one (1) 3 in. conduit and
two (2) 2 ½ in. conduits entering on the
same side and exiting on the opposite wall.
No splices or terminations will be made in
the box. Which of the following listed
junction boxes is the MINIMUM required for
this installation?
18 in. x 12 in.
B. 20 in. x 18 in.
C. 20 in. x 20 in.
D. 24 in. x 24 in.
A.
57.
D
Reference
NEC PG. #
314.28(A)(1)
183
3 in. (largest conduit) x 8 = 24 in.
O 58. Where conduits enter a floor-standing
switchboard or panelboard at the bottom,
the conduits, including their end fittings,
shall NOT rise more than _______ above the
bottom of the enclosure.
6 inches
B. 3 inches
C. 2 inches
D. 4 inches
A.
58.
B
Reference
NEC PG. #
408.5
275
O 59. A bonding jumper connected between
the communications grounding electrode
and power grounding electrode system at
the building or structure service where
separate electrodes are used shall NOT be
smaller than ______ copper.
8 AWG
B. 6 AWG
C. 12 AWG
D. 10 AWG
A.
59.
B
Reference
NEC PG. #
800.100(D)
674
O 60. Which of the following listed copper
conductors, is the MINIMUM size 75°C
rated conductors required to supply a
continuous-duty, 25 hp, 208-volt, 3-phase
motor, where the motor is on the end of a
short conduit run that contains only three
(3) conductors, at an ambient temperature
of 115°F?
1 AWG THWN
B. 2 AWG THWN
C. 1 AWG THHN
D. 1/0 AWG THWN
A.
Question
Reference
NEC PG. #
60.
A
430.22
Tbl. 430.250
Tbl. 310.15(B)(16)(a)
Tbl. 310.15(B)(16)
316
338
150
154
25 hp motor FLC = 74.8 amperes x 125% = 93.5 amperes
93.5 amperes ÷ .75 (temperature correction) = 124.6 amperes
* NOTE – The wire size needs to be increased because of the
elevated ambient temperature. Size 1 AWG THWN conductors with
allowable ampacity of 130 amperes should be selected
O 61. Single-conductor cable Type ______
shall be permitted in exposed outdoor
locations in photovoltaic source circuits for
photovoltaic module interconnections within
the photovoltaic array.
UF
B. THHN
C. USE-2
D. THWN
A.
61.
C
Reference
NEC PG. #
690.31(B)
601
O 62. For track lighting installed in a retail
store, a MAXIMUM of two (2) feet of lighting
track or fraction thereof shall be considered
______.
150 VA
B. 180 VA
C. 200 VA
D. 100 VA
A.
62.
A
Reference
NEC PG. #
220.43(B)
64
O 63. Where fixed wiring above bulk fuel
storage tanks is installed in PVC conduit, the
PVC shall be Schedule ________.
20
B. 40
C. 80
D. 100
A.
63.
C
Reference
NEC PG. #
515.7(A)
429
O 64. Disregarding exceptions, the MINIMUM
size grounded or undergrounded conductors
permitted to be connected in parallel is
_____.
6 AWG
B. 1 AWG
C. 2 AWG
D. 1/0 AWG
A.
64.
D
Reference
NEC PG. #
310.10(H)(1)
429
O 65. In general, 4 in. wide underfloor
raceways shall have a covering of wood or
concrete of NOT less than _______ above
the raceway.
½ in.
B. ¾ in.
C. 1 in.
D. 1 ¼ in.
A.
65.
B
Reference
NEC PG. #
390.4(A)
238
O 66. Exposed trade size ¾ in. Schedule 40
PVC conduit is required to be securely
supported at intervals NOT to exceed
_______.
3 feet
B. 4 feet
C. 6 feet
D. 8 feet
A.
66.
A
Reference
NEC PG. #
352.30(B)
Tbl. 352.30
209
210
O 67. Receptacles located within the patient
care areas of pediatric wards shall be
______ or shall employ a listed tamperresistant cover.
15 ampere rated
B. Provided with GFCI
C. A single receptacle type
D. Listed tamper-resistant
A.
67.
D
Reference
NEC PG. #
517.18(C)
444
O 68. What is the MAXIMUM length permitted
of a flexible cord that may be used to cordand-plug connect a water circulating pump
motor for a swimming pool at a dwelling?
3 feet
B. 4 feet
C. 6 feet
D. 10 feet
A.
68.
A
Reference
NEC PG. #
680.21(A)(5)
579
O 69. The MAXIMUM height above the floor or
working platform to the center of the
operating handle of a service disconnecting
switch when it is in the ON position must not
exceed ______.
6 feet
B. 6 ft. 6 in.
C. 6 ft. 7 in.
D. 7 feet
A.
69.
C
Reference
NEC PG. #
404.8(A)
267 & 268
O 70. The upward discharging vent of an
underground fuel tank of motor fuel
dispensing facilities is classified as a Class I,
Division 1 location WITHIN ______ of the
open vent.
3 feet
B. 5 feet
C. 6 feet
D. 8 feet
A.
70.
B
Reference
NEC PG. #
Tbl. 514.3(B)(1)
427
O 71. Flexible metallic tubing (FMT) shall NOT
be used in lengths exceeding _______.
5 feet
B. 6 feet
C. 8 feet
D. 10 feet
A.
71.
B
Reference
NEC PG. #
360.12(6)
219
O 72. Unless approved for a higher voltage,
surface nonmetallic raceways are NOT
approved where the voltage is ______ or
more between conductors.
120 volts
B. 150 volts
C. 300 volts
D. 250 volts
A.
72.
C
Reference
NEC PG. #
388.12(3)
237
O 73. What is the MINIMUM permitted sill
height of a transformer vault doorway?
2 inches
B. 8 inches
C. 6 inches
D. 4 inches
A.
73.
D
Reference
NEC PG. #
450.43(B)
354
O 74. PVC conduit used exposed in areas of
physical damage shall be ________.
Type Schedule 80
B. Type Schedule 40
C. Type Schedule 100
D. Prohibited
A.
74.
A
Reference
NEC PG. #
352.10(F),IN
209
O 75. Determine the MAXIMUM setting
permitted for the overload protection for a 7
½ hp, 3-phase, 480 volt, induction-type ac
motor with a full-load current of 15
amperes, an 86% power factor, and a
service factor of 1.00 indicated on the
nameplate. (Assume exceptions and
modifications are not to be applied.)
17.25 amperes
B. 12.65 amperes
C. 18.75 amperes
D. 13.75 amperes
A.
75.
A
Reference
NEC PG. #
430.32(A)(1)
319
Nameplate rating of motor = 15 amperes x 1.15 = 17.25 amperes
O 76. Where a portable generator is used for a
portable optional standby source and is not
considered a separately derived system, the
equipment grounding conductor shall be
bonded to ________.
The generator frame and the grounded
conductor
B. The system grounding electrode
C. A grounding conductor only
D. The grounded conductor
A.
76.
B
Reference
NEC PG. #
702.11(B)
631
O 77. Where track lighting installed in a
continuous row, each individual section of
NOT More than ______ in length shall be
securely supported.
2 feet
B. 4 feet
C. 6 feet
D. 8 feet
A.
77.
B
Reference
NEC PG. #
410.154
289
O 78. A transformer is to be supplied with four
(4) parallel size 500 kcmil conductors per
phase. The conductors will enter the
enclosure on the opposite wall of the
terminals. What is the MINIMUM wirebending space required for the conductors?
10 inches
B. 12 inches
C. 14 inches
D. 16 inches
A.
78.
D
Reference
NEC PG. #
312.6(B)(2)
Tbl.312.6(B)
174
176
O 79. For trade size ¾ in. Type MI cable, the
radius of the inner edge of the bend shall
NOT be less than _______ times the external
diameter of the cable.
Three
B. Four
C. Five
D. Seven
A.
79.
C
Reference
NEC PG. #
332.24(1)
195
O 80. Manhole covers shall be OVER ______ or
otherwise require the use of tools to open.
25 lbs.
B. 50 lbs.
C. 75 lbs.
D. 100 lbs.
A.
80.
D
Reference
NEC PG. #
110.75(D)
45
O 81. Size 4/0 AWG, 75°C aluminum
secondary conductors of a 3-phase, deltawye transformer, shall be protected at NOT
more than _______.
175 amperes
B. 200 amperes
C. The calculated load connected to the
transformer
D. None of these, because secondary
protection is not required for multiphase,
delta-wye transformer secondary
conductors.
A.
81.
B
Reference
NEC PG. #
Tbl. 310.15(B)(16)
240.4(B)(3)
240.6(A)
154
90
91
Size 4/0 AWG AL conductors rated @ 75º C ampacity = 180 amperes
Next standard size OCP is rated 200 apmeres.
*NOTE – Sec. 240.4(F) requires secondary OCP on delta – wye
transformers.
O 82. For the purpose of determining
conductor fill in conduit, a flexible cord or
cable of four (4) conductors shall be treated
as ________ conductor(s).
One
B. Two
C. Three
D. Four
A.
Question
Reference
NEC PG. #
82.
A
Note 9 Chpt. 9 Tbls.
711
O 83. Where the grounding electrode system
of a building or structure consists of three
(3) driven ground rods, the ground rods shall
be spaced NOT less than ______ apart.
4 feet
B. 5 feet
C. 6 feet
D. 8 feet
A.
83.
C
Reference
NEC PG. #
250.53(B)
112
O 84. What is the MAXIMUM size overcurrent
protection device required to protect size 14
AWG copper conductors used for a pump
motor control-circuit that is protected by the
motor branch circuit protection device and
extends beyond the enclosure?
15 amperes
B. 20 amperes
C. 45 amperes
D. 100 amperes
A.
84.
C
Reference
NEC PG. #
430.72(B)(2)
Tbl. 430.72(b)
Col. C
326
327
O 85. What is the MAXIMUM number of size
12 AWG THHN conductors permitted to be
installed in a trade size 3/8 in. flexible metal
conduit (FMC) where the fittings are outside
the FMC?
Five
B. Two
C. Three
D. Four
A.
85.
D
Reference
NEC PG. #
Tbl. 348.22
206
3 + 1 equipment grounding conductor = 4 conductors total
O 86. A 120/240 volt, single-phase feeder of a
retail shopping mall is to supply a
noncontinuous load of 20,000 VA and a
continuous load 16,000 VA. Consider the
overcurrent device protecting the feeder
conductors is not listed for operation at 100
percent of its rating and determine the
MINIMUM size 75°C copper conductors
required for this installation
1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 1 AWG
A.
86.
B
Reference
NEC PG. #
215.2(A)(1)
59
Single – Phase current formula
Tbl. 310.15(B)(16)
154
20,000 VA x 100% = 20,000 VA
16,000 VA x 125% = 20,000 VA
Total
= 40,000 VA
I = power I = 40,000 VA = 166.6 amperes
volts
240 volts
* NOTE – Size 2/0 AWG conductors with an allowable
ampacity of 175 amperes should be selected.
O 87. Apply the optional method of
calculations for dwelling units and
determine the demand load, in kW, on the
ungrounded (line) service-entrance
conductors for the electric ranges, where a
12 unit multifamily dwelling has an 8 kW
range in each apartment.
39.36 kW
B. 30.72 kW
C. 27.00 kW
D. 96.00 kW
A.
87.
A
Reference
NEC PG. #
220.84(C)b.
Tbl. 220.84
69
69
8 kW x 12 units = 96 kW (connected load) x 41% = 39.36 kW
O 88. An indoor installed 100 kVA, dry-type
transformer with a 4,160 volt primary, must
have a clearance of at LEAST _______ from
combustible material unless separated from
the combustible material by a fire-resistant,
heat-insulated barrier.
6 inches
B. 8 inches
C. 10 inches
D. 12 inches
A.
88.
D
Reference
NEC PG. #
450.21(A)
352
O 89. Interior metal water lines located NOT
more than ____ from the point of entrance
to the building shall be permitted to be used
as a conductor to interconnect electrodes
that are part of the grounding electrode
system.
10 feet
B. 8 feet
C. 5 feet
D. 20 feet
A.
89.
C
Reference
NEC PG. #
250.68(C)(1)
116
O 90. The independent support wires used to
support electrical metallic tubing (EMT) and
flexible metal conduit (FMT) above a nonfire-rated ceiling shall be distinguishable
from the ceiling support wires by means of
________.
O I. Color
O II. Tagging
I only
B. II only
C. Either I or II
D. Neither I nor II
A.
90.
C
Reference
NEC PG. #
300.11(2)
141
O 91. Which of the following listed raceways is
approved for use supplying wet-niche
luminaires in a permanently installed
swimming pool?
Galvanized rigid metal conduit (RMC)
B. Polyvinyl chloride conduit (PVC)
C. Flexible nonmetallic conduit (FNC)
D. All of these listed are approved.
A.
91.
B
Reference
NEC PG. #
680.23(B)(2)
581
O 92. Power distribution blocks shall be
permitted to be placed in pull and junction
boxes having a volume over at LEAST _____
for connections of conductors installed in
boxes where the power distribution blocks
do not have uninsulated live parts exposed
within the box, whether or not the box cover
is installed.
30 cu. In.
B. 60 cu. In.
C. 75 cu. In.
D. 100 cu. In.
A.
92.
D
Reference
NEC PG. #
314.28(E)(2)
184
O 93. The circuit disconnecting means for non-
power-limited fire alarm (NPLFA) circuits
shall have ______ colored identification,
shall be accessible only to qualified persons
and shall be identified as “FIRE ALARM
CIRCUIT.”
Red
B. Orange
C. Yellow
D. Blue
A.
93.
A
Reference
NEC PG. #
760.41(B)
652
O 94. A flexible metal conduit (FMC) having a
length of 4 ft. is to supply a panelboard from
a transformer. The FMC will contain three (3)
size 400 kcmil THWN copper conductors
and one (1) size 350 kcmil THWN copper
conductor. In compliance with the NEC®,
what is the MINIMUM trade size FMC
required.
2 ½ in.
B. 3 in.
C. 3 ½ in.
D. 4 in.
A.
94.
C
Reference
NEC PG. #
Annex C, Tbl. C.3
755
O 95. An outside overhead span of 3-phase, 4
wire, 480Y/277 volt conductors are to be
installed between two buildings of a college
campus. The area the conductors cross will
not be subject to truck traffic. The
conductors must have a MINIMUM
clearance of ______ from final grade.
10 feet
B. 12 feet
C. 15 feet
D. 18 feet
A.
95.
B
Reference
NEC PG. #
225.18(2)
72
O 96. Cables over 600 volts and those rated
600 volts or less, are permitted to be
installed in a common cable tray without a
fixed barrier, where the cables over 600
volts are _______.
Type MI
B. Type NM
C. Type CT
D. Type MC
A.
96.
D
Reference
NEC PG. #
392.20(B)(1)
241
O 97. When calculating the total load for a
mobile home park before demand factors
are taken into consideration, each individual
mobile home lot shall be calculated at a
MINIMUM of _________.
15,000 VA
B. 16,000 VA
C. 20,000 VA
D. 24,000 VA
A.
97.
B
Reference
NEC PG. #
550.31(1)
489
O 98. Where a restaurant located in a retail
shopping mall has a main circuit breaker
rated for 400 amperes, the required
bonding jumper to the metal water piping
system is to be at LEAST _______ copper.
6 AWG
B. 2 AWG
C. 3 AWG
D. 4 AWG
A.
98.
C
Reference
NEC PG. #
250.104(A)(2)
Tbl. 250.122
119
125
O 99. In general, on the load side of the point
of grounding of a separately derived system
such as a transformer, a grounded
conductor is NOT permitted to be connected
to ________.
Equipment grounding conductors
B. Normally non-current-carrying metal parts
of equipment
C. The system bonding jumper
D. Any of these
A.
99.
D
Reference
NEC PG. #
250.30(A)
106
O 100. Where one or more receptacle outlets
are provided for the show window lighting in
a retail store, the outlet(s) shall be installed
within at LEAST ________ of the top of the
show window.
12 inches
B. 18 inches
C. 24 inches
D. 30 inches
A.