Transcript National Electrical Code Article 314

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310.2 Conductors
(A) Insulated - Conductors Shall be Insulated
Exception: Where covered or bare conductors are
specifically permitted else where in this code.
(B) Conductor Material. – Conductors in this article
shall be of aluminum, copper – clad aluminum, or
copper unless otherwise specified.
310.3 Stranded Conductors
Where installed in raceways, conductors of size 8
AWG and larger shall be stranded.
Exception: As permitted or required elsewhere in this
Code.
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310.8 Locations
(A) Dry Locations. – Insulated conductors and
cables used in dry locations shall be any of the
types identified in this Code.
(B) Dry and Damp Locations. – Insulated
conductors and cables used in dry and damp
locations shall be Types FEP, FEPB, MTW, PFA, RHH,
RHW, RHW-2, SA, THHN, THW, THW-2, THHW,
THWN, THWN-2, TW, XHH, XHHW, XHHW – 2, Z, OR
ZW.
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310.8 Locations (cont.’d)
(C) Wet Locations. – Insulated conductors and
cables used in wet locations shall comply with one
of the following:
1) Be moisture – impervious metal – sheathed
2) Be types MTW, RHW, RHW-2, TW, THW, THW-2, THHW,
THWN, THWN-2, XHHW, XHHW-2, ZW.
3) Be of a type listed for use in wet locations.
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310.8 Locations (cont.’d)
(D) Locations Exposed to Direct Sunlight. –
Insulated conductors or cable used where exposed
to direct rays of the sun shall comply with:
1) Conductors and cables
shall be listed, or listed
and marked, as being
sunlight resistant.
2) Covered with insulating
material, such as tape or
sleeving, that is listed, or
listed and marked, as
being sunlight resistant
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This material was extracted from Mike Holt Training Materials
copyright 2007 by permission. Visit mikeholt.com or call
1.888.NEC.CODE (632-2633) for more information.
310.9 Corrosive Conditions. Conductors exposed to oils, greases, vapors, gases,
fumes, liquids, or other substances having a
deleterious effect on the conductor or insulation
shall be of a type suitable for the application.
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310.10 Temperature Limitation of Conductors.
No conductor shall be used in such a manner that
its operating temperature exceeds that designated
for the type of insulated conductor involved. In no
case shall conductors be associated together in
such a way, with respect to type of circuit, the
wiring method employed, or the number of
conductors, that the limiting temperature of any
conductor is exceeded.
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310.10 Temperature Limitation of Conductors
This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit
mikeholt.com or call 1.888.NEC.CODE (632-2633) for more information.
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310.11 Marking.
(A) Required Information. All conductors and cables
shall be marked to indicate the following
information, using the applicable method described
in 310.11(B):
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(1) The maximum rated voltage.
(2) The proper type letter or letters for the type of wire
or cable as specified elsewhere in this Code.
(3) The manufacturer's' name, trademark, or other
distinctive marking by which the organization responsible
for the product can be readily identified.
(4) The A W G size or circular mil area.
(5) Cable assemblies where the neutral conductor is
smaller than the ungrounded conductors shall be so
marked.
310.13 Conductor Constructions and
Applications.
Insulated conductors shall comply with the
applicable provisions of Table 310.13, 310.62,
310.63, and 310.64
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Table 310.13
Provides useful
information
about wire
styles and uses.
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Voltage drop can
occur when wire
sizing is not
considered.
E=IXR
Voltage = Amp times Resistance
#10 wire = 1.00 ohms @ 1,000
feet
15 v = 15 Amp x 1.00 ohm
115v – 15v = 100v
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Adjustment for
temperature
exposure and wiring
limit within a
conduit.
This material was extracted from Mike Holt Training Materials copyright 2007 by
permission. Visit mikeholt.com or call 1.888.NEC.CODE (632-2633) for more
information.
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310.15 Ampacities for Conductors Rated 0 –
2000 volts
(1) Tables or Engineering Supervision.
Ampacities for conductors shall be permitted to be
determined by tables or under engineering supervision,
as provided in 310.15(b) and (c).
(2) Selection of Ampacity.
Where more than one calculated or tabulated ampacity
could apply for a given circuit length, the lowest value
shall be used.
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310.15 Ampacities for Conductors (cont.’d)
(B) Tables.
Ampacities for conductors rated 0 – 2000 volts shall be as
specified in the Allowable Ampacity Table 310.16 through
310.19 and Ampacity Table 310.20 through 310.23 as
modified by (1) through (6).
(2) Adjustment Factors.
(a) More Than Three Current – Carrying Conductors in a
Raceway or Cable. Where the number of current –
carrying conductors in a raceway or cable exceeds three,
or where single conductors or multcondutor cables are
stacked or bundled longer than 600 mm (24 in.) without
maintaining spacing and are not installed in raceways,
the allowable ampacity of each conductor shall be
reduced as shown in Table 310.15(b)(2)(a).
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Table 310.16
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Use Table 310.15(b)(2)(a) to adjust current
carrying capacity more than 3 conductors share
the same raceway or conduit.
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When the exposure temperature exceeds 86º F
then a correction factor is applied.
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310.15 Ampacities for Conductors (cont.’d)
(3) Bare or Covered Conductors.
Where bare or covered conductors are used with
insulated conductors, their allowable ampacities shall be
limited to those permitted for the adjacent insulated
conducts.
(4) Neutral Conductor
(a) A neutral conductor that carries only the unbalanced
current from other conductors of the same circuit shall
not be required to be counted when applying the
provisions of 310.15(b)(2)(a).
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310.15 Ampacities for Conductors (cont.’d)
(5) Grounding or Bonding Conductor. A grounding
or bonding conductor shall not be counted when
applying the provisions of 310.15(b)(2)(a)
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