Transcript Practice Code Look Up

Practice Code Look
Up
Smitty’s Speed Drills
2008 NEC
Copyright 208 Ted "Smitty" Smith
Directions
• Left click on the presentation ICON located at the bottom of
the slide directory to the left of the this slide.
• Each slide will transition to the correct answer automatically
in 2:00 minutes. The correct answer will transition in 5
seconds.
• Do not worry about writing down the correct answer for now.
You will have the opportunity to do that at the end of the two
minute drill
• Good luck
• Some of the the slides will transistion faster than others as
some timers are intentionally set to less than 2 minutes.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• A luminaire is installed in a clothes closet
and the nearest point of storage space is
located 8 inches from the luminaire. The
luminaire is a recessed incandescent type. Is
this a legal application?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Yes 6 Inches required
Copyright 2005 Ted "Smitty" Smith
410.36(C)(3)
Grounding
• The earth shall not be considered as an
effective ground fault current path. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True
250.4(A)(5)
Copyright 2005 Ted "Smitty" Smith
Grounding
• An equipment grounding conductor is
connected to a disconnect enclosure by
means of a mechanical lug. The lug is
connected to the enclose by means of a
thread forming machine screw. Is this an
acceptable installation?
Copyright 2005 Ted "Smitty" Smith
Grounding
• Yes
250.8(A)(6)
Copyright 2005 Ted "Smitty" Smith
Raceways
• A 10 foot, unbroken piece of electrical
nonmetallic tubing is fished into an existing
wall to feed a new junction box. No supports
are placed on the electrical nonmetallic
tubing inside the wall or within three feet of
the junction box. Is this an acceptable
installaion?
Copyright 2005 Ted "Smitty" Smith
Raceways
• Yes
362.30(A) Exception 3
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• All convenience receptacles in a home
including the kitchen counter top receptacles
shall be tamper resistant type. True or False
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• True
406.11
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Wiring installed in aircraft hangars in unclassified
locations that are adjacent to areas in which
flammable liquids or vapors are not likely to be
released, such as stock rooms or electrical control
rooms, which are adequately ventilated and are
effectively cut off from the hangar itself by walls or
partitions, shall be permitted to be of any suitable
type wiring method recognized by chapter 3 of the
NEC. True or False
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• True Exception to 513.7
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A cow milking station building has a 2”
concrete floor with metal rails separating
each milking station. Each milking station
has an electric milking unit including
disconnect mounted to the separating rail. Is
an equipotential plane required in the floor of
this building?
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• Yes 547.10(A)(1)
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• Several receptacles are installed in a health
care facility. The receptacles are fed from the
emergency system. Each receptacle is
hospital grade with the correct ratings
required. The receptacles are placed on the
same wall as receptacles fed from the
normal system. All receptacles are tamper
resistant, ivory in color with ivory
nameplates. Is this installation acceptable?
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• No 517.30 (E)
• The emergency system receptacles must be
identified with a distinctive color or marking.
Copyright 2005 Ted "Smitty" Smith
Services
• Type SE cable when used as service cables
shall be permitted to be formed in a
gooseneck patern and used without a service
head if it is taped with a _______________
weather resistant thermoplastic.
– A. black or red
– B. self sealing
– C. listed
– D. approved
Copyright 2005 Ted "Smitty" Smith
Services
• Self sealing
230.54(B)
Copyright 2005 Ted "Smitty" Smith
Services
• Raceways that carry service-conductors that
are embedded in masonry shall be
__________.
Copyright 2005 Ted "Smitty" Smith
Services
• Arranged to drain
230.53
Copyright 2005 Ted "Smitty" Smith
Services
• The disconnecting means for power monitoring equipment,
surge protective devices, control circuit of the ground fault
protection system, and ___________ service disconnecting
means shall not be considered as a switch for the purpose
of determining the maximum number of switches for the
service disconnecting means.
– A. secondary
– B. power operable
– C. manually operated
– D. None of the above
Copyright 2005 Ted "Smitty" Smith
Services
• Power operable
230.71(A)
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A site isolating device shall be installed at the
distribution point where __________ or more
agricultural buildings or structures are
supplied from the distribution point.
– A. 1
– B. 3
– C. 5
– D. None of the above
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• None of the above
547.9(A)(1)
• Two or more is the correct answer
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A switch that is located outside of the patient
care vicinity in a patient care area of a healt
care facility shall be permitted to be installed
without an insulated equipment grounding
conductor.
– True
– False
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• True
517.13(B) Exception 2
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A site isolating device used in an agricultural
facility shall be permanently marked to
identify it as a site isolating device. This
marking shall be located _______________
or immediately adjacent thereto.
– A. at the main service entrance
– B. inside the disconnecting cover
– C. on the operating handle
– D. on the face of the disconnecting means
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• On the operating handle
547.9(A)(10)
Copyright 2005 Ted "Smitty" Smith
Calculations
• A conductor passing through a junction box
with a loop length of ______________ shall
be counted twice for box fill calculations.
Copyright 2005 Ted "Smitty" Smith
Calculations
• Twice the minimum length required by Article
300.14
•
314.16(B)(1)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• A 1/2" knockout will be made in a fluorescent
light fixture that will be mounted over a
junction box. The light fixture will be mounted
with toggle bolts. A 1/2" chase nipple will be
installed so that the conductors from the box
can be brought into the fixture for make up.
Is this is legal installation according to the
NEC?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• No
410.14(A)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Is thermal protection required for the ballast
of a fluorescent exit light?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• No
410.73(E)(3)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• The size of a feeder, grounded conductor
shall not be smaller than required
by_________, except that _________ shall
not apply where grounded conductors are
run in parallel.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 250.122, 250.122(F)
215.2(A)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• Where the premises wiring system has
branch circuits supplied from more than one
nominal voltage system, each ungrounded
conductor of a branch circuit, where
accessible, shall be identified by
__________.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• System
210.5(C)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• The size of the industrial control panel supply
conductor shall have an ampacity not less
than ________ percent of the full load
current of all resistance heating loads plus
125% of the full load current rating of the
highest rated motor plus the sum of the full
load current ratings of all connected motors
and apparatus based on their duty cycle that
may be in operation at the same time.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• 125%
409.20
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• A ballast in a fluorescent luminaire that is
used for egress lighting and energized only
during a failure of the normal supply shall not
have ________________.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Thermal Protection
410.73(E)(4)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• A load not less than ___________ volt
amperes shall be included for each 2-wire
laundry branch circuit installed as required by
210.11(C)(2).
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 1500
220.52(B)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• An alternate load calculation for determine if
the existing service or feeder is of sufficient
capacity to serve additional loads in an
existing dwelling unit is found in
__________________.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 220.83 220.83
Copyright 2005 Ted "Smitty" Smith
Grounding
• The earth shall not be considered as an
effective ground fault current path. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True
250.4(A)(5)
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• The secondary conductors of a delta-wye three phase
transformer are protected from overcurrent by the
transformer’s primary overcurrent device only. The
secondary conductors are 10’ 3” in length. The combined
calculated loads of the secondary conductors is 110
amperes. The secondary conductors feed a 125 ampere
main breaker. The secondary conductors are enclosed in
EMT. Conditions of maintenance and supervision do not
ensure that only qualified personnel will service the system.
Is this an acceptable installation according to the NEC?
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• NO 240.21 (3)(1)
• This tap is greater than 10 feet in length. The
code now requires that taps greater than 10
feet must be made so that maintenance and
service are done by qualified personnel. This
typically means that the facility has a full time
electrical staff.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Handhold enclosure covers shall have an
_____________________ that prominently
identifies the function of the enclosure.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• identifying mark or logo 314.30(D)
Copyright 2005 Ted "Smitty" Smith
Conductors and Cable
Assemblies
• Type MC cable does not have to be
supported if it is not more than 2 feet long
and it is being used to provide flexibility to a
termination. True or False
Copyright 2005 Ted "Smitty" Smith
• True
Conductors and Cable
Assemblies
320.30(D)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Wiring installed in aircraft hangars in unclassified
locations that are adjacent to areas in which
flammable liquids or vapors are not likely to be
released, such as stock rooms or electrical control
rooms, which are adequately ventilated and are
effectively cut off from the hangar itself by walls or
partitions, shall be permitted to be of any suitable
type wiring method recognized by chapter 3 of the
NEC. True or False
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• True Exception to 513.7
Copyright 2005 Ted "Smitty" Smith
Services
• A cable tray may serve to carry serviceentrance conductors along with other
conductors as long as there is a ________.
Copyright 2005 Ted "Smitty" Smith
Services
• Barrier
230.44Ex
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• The 480 volt auxiliary equipment of an
electric discharge lamp is permanently
installed in a luminaire and the luminaire is
mounted on a pole for the illumination of a
highway. What is the minimum height above
the ground the auxiliary equipment must be
mounted?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• 22 ft 210.6(D)(1)(a)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Is the terminal of an electric discharge lamp
rated in excess of 1000V considered to be a
live part according to the NEC?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Yes 410.80 (C)
Copyright 2005 Ted "Smitty" Smith
Services
• The service head for entrance-conductors
should be located above the point of
attachment but may be located elsewhere as
long as the attachment is within __________
feet.
Copyright 2005 Ted "Smitty" Smith
Services
• 2 feet
230.54(C) Ex
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• Can the next standard sized overcurrent
protective device be used to protect tap
conductors for transformer secondary
conductors?
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• NO 240.21(C)
Copyright 2005 Ted "Smitty" Smith
Grounding
• All grounding electrodes as described in 250.
52(A)(1) through 250.52(A)(6) that are
____________ at each building or structure
served shall be bonded together to form the
grounding electrode system.
Copyright 2005 Ted "Smitty" Smith
Grounding
• Present
250.50
Copyright 2005 Ted "Smitty" Smith
Grounding
• When bonding equipment, __________shall
not be used for this connection and the
termination shall not depend solely
on__________________.
Copyright 2005 Ted "Smitty" Smith
Grounding
• Sheet metal screws, solder 250.8
Copyright 2005 Ted "Smitty" Smith
Grounding
• Is an equipment grounding conductor
required to be installed in listed metal flexible
conduit that is 2 feet in length and is used
only to provide flexible connection to a
motor?
Copyright 2005 Ted "Smitty" Smith
Grounding
• Yes 250.118(5)(d)
Copyright 2005 Ted "Smitty" Smith
Grounding
• Exposed, non-current carrying, metal parts of
motion picture projection equipment that is
fastened in place shall be grounded
regardless of voltage. True or False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True 250.112 (H
Copyright 2005 Ted "Smitty" Smith
Grounding
• Exposed, non-current carrying, metal parts of
equipment that is connected by cord and
plug, regardless of voltage, that is installed in
non-hazardous locations shall be grounded.
True or False
Copyright 2005 Ted "Smitty" Smith
Grounding
• False 250.114 (1) and (2)
Copyright 2005 Ted "Smitty" Smith
Grounding
• The connection of a grounding electrode
conductor or bonding jumper to fire-proofed
structural steel shall not be required to be
accessible if it is made with an irreversible
compression connection. True or False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True 250.68 (A) Exep. 2
Copyright 2005 Ted "Smitty" Smith
Grounding
• A ground rod of 8 feet in length must be
installed so that the connection point of the
grounding electrode conductor remains
accessible and above the ground. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• False 250.53 (G) and 250.68 (A) Exp. 1
Copyright 2005 Ted "Smitty" Smith
Grounding
• The ground fault current path of the
equipment grounding system is intended to
return fault current back to the earth. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• False 250.2 Back to the source
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• Where calculations result in a fraction of an
ampere that is less than __________, such
fractions shall be permitted to be dropped.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• .5
220.5(B)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• Outlets for heavy duty lamp holders shall be
calculated at a minimum of _______ voltamperes.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 600
220.14(E)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• The rules for calculating the load on fixed
multi-outlet assemblies are found in
_______________.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 220.14(H)
220.14(H)
Copyright 2005 Ted "Smitty" Smith
The End
• Each of the slides will now be repeated.
• They are not timed in this segment. To
change a slide, click on the side with your left
mouse button.
• Be sure to physically look up the answers in
your code book to improve your look up
speed and skill.
Copyright 2005 Ted "Smitty" Smith
Practice Code Look
Up
Questions and Answers
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• A luminaire is installed in a clothes closet
and the nearest point of storage space is
located 8 inches from the luminaire. The
luminaire is a recessed incandescent type. Is
this a legal application?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Yes 6 Inches required
Copyright 2005 Ted "Smitty" Smith
410.36(C)(3)
Grounding
• The earth shall not be considered as an
effective ground fault current path. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True
250.4(A)(5)
Copyright 2005 Ted "Smitty" Smith
Grounding
• An equipment grounding conductor is
connected to a disconnect enclosure by
means of a mechanical lug. The lug is
connected to the enclose by means of a
thread forming machine screw. Is this an
acceptable installation?
Copyright 2005 Ted "Smitty" Smith
Grounding
• Yes
250.8(A)(6)
Copyright 2005 Ted "Smitty" Smith
Raceways
• A 10 foot, unbroken piece of electrical
nonmetallic tubing is fished into an existing
wall to feed a new junction box. No supports
are placed on the electrical nonmetallic
tubing inside the wall or within three feet of
the junction box. Is this an acceptable
installaion?
Copyright 2005 Ted "Smitty" Smith
Raceways
• Yes
362.30(A) Exception 3
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• All convenience receptacles in a home
including the kitchen counter top receptacles
shall be tamper resistant type. True or False
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• True
406.11
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Wiring installed in aircraft hangars in unclassified
locations that are adjacent to areas in which
flammable liquids or vapors are not likely to be
released, such as stock rooms or electrical control
rooms, which are adequately ventilated and are
effectively cut off from the hangar itself by walls or
partitions, shall be permitted to be of any suitable
type wiring method recognized by chapter 3 of the
NEC. True or False
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• True Exception to 513.7
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A cow milking station building has a 2”
concrete floor with metal rails separating
each milking station. Each milking station
has an electric milking unit including
disconnect mounted to the separating rail. Is
an equipotential plane required in the floor of
this building?
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• Yes 547.10(A)(1)
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• Several receptacles are installed in a health
care facility. The receptacles are fed from the
emergency system. Each receptacle is
hospital grade with the correct ratings
required. The receptacles are placed on the
same wall as receptacles fed from the
normal system. All receptacles are tamper
resistant, ivory in color with ivory
nameplates. Is this installation acceptable?
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• No 517.30 (E)
• The emergency system receptacles must be
identified with a distinctive color or marking.
Copyright 2005 Ted "Smitty" Smith
Services
• Type SE cable when used as service cables
shall be permitted to be formed in a
gooseneck patern and used without a service
head if it is taped with a _______________
weather resistant thermoplastic.
– A. black or red
– B. self sealing
– C. listed
– D. approved
Copyright 2005 Ted "Smitty" Smith
Services
• Self sealing
230.54(B)
Copyright 2005 Ted "Smitty" Smith
Services
• Raceways that carry service-conductors that
are embedded in masonry shall be
__________.
Copyright 2005 Ted "Smitty" Smith
Services
• Arranged to drain
230.53
Copyright 2005 Ted "Smitty" Smith
Services
• The disconnecting means for power monitoring equipment,
surge protective devices, control circuit of the ground fault
protection system, and ___________ service disconnecting
means shall not be considered as a switch for the purpose
of determining the maximum number of switches for the
service disconnecting means.
– A. secondary
– B. power operable
– C. manually operated
– D. None of the above
Copyright 2005 Ted "Smitty" Smith
Services
• Power operable
230.71(A)
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A site isolating device shall be installed at the
distribution point where __________ or more
agricultural buildings or structures are
supplied from the distribution point.
– A. 1
– B. 3
– C. 5
– D. None of the above
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• None of the above
547.9(A)(1)
• Two or more is the correct answer
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A switch that is located outside of the patient
care vicinity in a patient care area of a healt
care facility shall be permitted to be installed
without an insulated equipment grounding
conductor.
– True
– False
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• True
517.13(B) Exception 2
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• A site isolating device used in an agricultural
facility shall be permanently marked to
identify it as a site isolating device. This
marking shall be located _______________
or immediately adjacent thereto.
– A. at the main service entrance
– B. inside the disconnecting cover
– C. on the operating handle
– D. on the face of the disconnecting means
Copyright 2005 Ted "Smitty" Smith
Special Occupancies
• On the operating handle
547.9(A)(10)
Copyright 2005 Ted "Smitty" Smith
Calculations
• A conductor passing through a junction box
with a loop length of ______________ shall
be counted twice for box fill calculations.
Copyright 2005 Ted "Smitty" Smith
Calculations
• Twice the minimum length required by Article
300.14
•
314.16(B)(1)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• A 1/2" knockout will be made in a fluorescent
light fixture that will be mounted over a
junction box. The light fixture will be mounted
with toggle bolts. A 1/2" chase nipple will be
installed so that the conductors from the box
can be brought into the fixture for make up.
Is this is legal installation according to the
NEC?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• No
410.14(A)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Is thermal protection required for the ballast
of a fluorescent exit light?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• No
410.73(E)(3)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• The size of a feeder, grounded conductor
shall not be smaller than required
by_________, except that _________ shall
not apply where grounded conductors are
run in parallel.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 250.122, 250.122(F)
215.2(A)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• Where the premises wiring system has
branch circuits supplied from more than one
nominal voltage system, each ungrounded
conductor of a branch circuit, where
accessible, shall be identified by
__________.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• System
210.5(C)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• The size of the industrial control panel supply
conductor shall have an ampacity not less
than ________ percent of the full load
current of all resistance heating loads plus
125% of the full load current rating of the
highest rated motor plus the sum of the full
load current ratings of all connected motors
and apparatus based on their duty cycle that
may be in operation at the same time.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• 125%
409.20
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• A ballast in a fluorescent luminaire that is
used for egress lighting and energized only
during a failure of the normal supply shall not
have ________________.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Thermal Protection
410.73(E)(4)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• A load not less than ___________ volt
amperes shall be included for each 2-wire
laundry branch circuit installed as required by
210.11(C)(2).
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 1500
220.52(B)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• An alternate load calculation for determine if
the existing service or feeder is of sufficient
capacity to serve additional loads in an
existing dwelling unit is found in
__________________.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 220.83 220.83
Copyright 2005 Ted "Smitty" Smith
Grounding
• The earth shall not be considered as an
effective ground fault current path. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True
250.4(A)(5)
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• The secondary conductors of a delta-wye three phase
transformer are protected from overcurrent by the
transformer’s primary overcurrent device only. The
secondary conductors are 10’ 3” in length. The combined
calculated loads of the secondary conductors is 110
amperes. The secondary conductors feed a 125 ampere
main breaker. The secondary conductors are enclosed in
EMT. Conditions of maintenance and supervision do not
ensure that only qualified personnel will service the system.
Is this an acceptable installation according to the NEC?
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• NO 240.21 (3)(1)
• This tap is greater than 10 feet in length. The
code now requires that taps greater than 10
feet must be made so that maintenance and
service are done by qualified personnel. This
typically means that the facility has a full time
electrical staff.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Handhold enclosure covers shall have an
_____________________ that prominently
identifies the function of the enclosure.
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• identifying mark or logo 314.30(D)
Copyright 2005 Ted "Smitty" Smith
Conductors and Cable
Assemblies
• Type MC cable does not have to be
supported if it is not more than 2 feet long
and it is being used to provide flexibility to a
termination. True or False
Copyright 2005 Ted "Smitty" Smith
• True
Conductors and Cable
Assemblies
320.30(D)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Wiring installed in aircraft hangars in unclassified
locations that are adjacent to areas in which
flammable liquids or vapors are not likely to be
released, such as stock rooms or electrical control
rooms, which are adequately ventilated and are
effectively cut off from the hangar itself by walls or
partitions, shall be permitted to be of any suitable
type wiring method recognized by chapter 3 of the
NEC. True or False
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• True Exception to 513.7
Copyright 2005 Ted "Smitty" Smith
Services
• A cable tray may serve to carry serviceentrance conductors along with other
conductors as long as there is a ________.
Copyright 2005 Ted "Smitty" Smith
Services
• Barrier
230.44Ex
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• The 480 volt auxiliary equipment of an
electric discharge lamp is permanently
installed in a luminaire and the luminaire is
mounted on a pole for the illumination of a
highway. What is the minimum height above
the ground the auxiliary equipment must be
mounted?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• 22 ft 210.6(D)(1)(a)
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Is the terminal of an electric discharge lamp
rated in excess of 1000V considered to be a
live part according to the NEC?
Copyright 2005 Ted "Smitty" Smith
Equipment Use
• Yes 410.80 (C)
Copyright 2005 Ted "Smitty" Smith
Services
• The service head for entrance-conductors
should be located above the point of
attachment but may be located elsewhere as
long as the attachment is within __________
feet.
Copyright 2005 Ted "Smitty" Smith
Services
• 2 feet
230.54(C) Ex
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• Can the next standard sized overcurrent
protective device be used to protect tap
conductors for transformer secondary
conductors?
Copyright 2005 Ted "Smitty" Smith
Overcurrent Protection
• NO 240.21(C)
Copyright 2005 Ted "Smitty" Smith
Grounding
• All grounding electrodes as described in 250.
52(A)(1) through 250.52(A)(6) that are
____________ at each building or structure
served shall be bonded together to form the
grounding electrode system.
Copyright 2005 Ted "Smitty" Smith
Grounding
• Present
250.50
Copyright 2005 Ted "Smitty" Smith
Grounding
• When bonding equipment, __________shall
not be used for this connection and the
termination shall not depend solely
on__________________.
Copyright 2005 Ted "Smitty" Smith
Grounding
• Sheet metal screws, solder 250.8
Copyright 2005 Ted "Smitty" Smith
Grounding
• Is an equipment grounding conductor
required to be installed in listed metal flexible
conduit that is 2 feet in length and is used
only to provide flexible connection to a
motor?
Copyright 2005 Ted "Smitty" Smith
Grounding
• Yes 250.118(5)(d)
Copyright 2005 Ted "Smitty" Smith
Grounding
• Exposed, non-current carrying, metal parts of
motion picture projection equipment that is
fastened in place shall be grounded
regardless of voltage. True or False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True 250.112 (H
Copyright 2005 Ted "Smitty" Smith
Grounding
• Exposed, non-current carrying, metal parts of
equipment that is connected by cord and
plug, regardless of voltage, that is installed in
non-hazardous locations shall be grounded.
True or False
Copyright 2005 Ted "Smitty" Smith
Grounding
• False 250.114 (1) and (2)
Copyright 2005 Ted "Smitty" Smith
Grounding
• The connection of a grounding electrode
conductor or bonding jumper to fire-proofed
structural steel shall not be required to be
accessible if it is made with an irreversible
compression connection. True or False
Copyright 2005 Ted "Smitty" Smith
Grounding
• True 250.68 (A) Exep. 2
Copyright 2005 Ted "Smitty" Smith
Grounding
• A ground rod of 8 feet in length must be
installed so that the connection point of the
grounding electrode conductor remains
accessible and above the ground. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• False 250.53 (G) and 250.68 (A) Exp. 1
Copyright 2005 Ted "Smitty" Smith
Grounding
• The ground fault current path of the
equipment grounding system is intended to
return fault current back to the earth. True or
False
Copyright 2005 Ted "Smitty" Smith
Grounding
• False 250.2 Back to the source
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• Where calculations result in a fraction of an
ampere that is less than __________, such
fractions shall be permitted to be dropped.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• .5
220.5(B)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• Outlets for heavy duty lamp holders shall be
calculated at a minimum of _______ voltamperes.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 600
220.14(E)
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• The rules for calculating the load on fixed
multi-outlet assemblies are found in
_______________.
Copyright 2005 Ted "Smitty" Smith
Feeders and Branch Circuits
• 220.14(H)
220.14(H)
Copyright 2005 Ted "Smitty" Smith