Chapter 3 Wiring Methods and Materials

ARTICLE 310 -
CONDUCTORS FOR GENERAL WIRING
310.13
Table 310.13(.) Continued
Thickness of Insulation
Maximum Operating
Trade Name Type Letter Temperature Application Provisions Insulation AWG or kcmi! rom mils Outer Covering)
Undergrou nd
serviceentrance
cable ­
single conductor
(for Type USE
cable employing
more than one
conductor, see
Article 338.)
USE 75°C
16TF
See Article 338.
Heat- and
moisture-resistant
14-iD
8-2
1-4/0
213-500
501-iDOO
1001-2000
1.14
1.52
2.03
2041
2.79
3.18
45
60
80
95'
liD
125
Moisture-resistant
nonmetallic covering
(See 338.2.)
1I!!B.2
~~~.l9!i~!Il!
Thermoset XHH 90°C Dry and damp locations Flame-retardant
14-iD 0.76 30
194°F
thermoset 8-2 1.14 45
1-4/0 lAO 55
213-500 1.65 65
501-iDOO 2.03 80
iDOI-2000 2041 95
None
MoislUre­ XHHW 4 90°C Dry and damp locations Flame-retardant, 14-iD 0.76 30
None
resistant
194°F moisture­ 8-2
1.14 45
thermoset 75°C Wet locations resistant thennoset 1-4/0 lAO 55
167°F 213-500 1.65 65
501-1000 2.03 80
1001-2000 2041 95
Moisture- XHHW-2 90°C Dry and wet locations Flame-retardant, 14-iD 0.76 30
None
resistant
194°F moisture­ 8-2 1.14 45
thermoset resistant thermoset 1-4/0
lAO 55
213-500 1.65 65
501-1000 2.03 80
1001-2000 2041 95
Modified ethylene Z
90°C Dry and damp locations Modified ethylene 14-12 0.38 15
None
tetrafiuoro­
194°F tetrafiuoro­ 10 0.51 20
ethylene 150°C Dry locations - special ethylene
8-4 0.64 25
302°F applications 2 3-1 0.89 35
1/0-4/0 1.14 45
Modified ethylene
tetrafiuoroethylene
ZW 75°C Wet locations Modified ethylene 14-10 0.76 30
None
167°F
tetrafiuoro­ 8-2 1.14 45
90°C Dry and damp locations ethylene
194°F
150°C Dry locations - special
302°F applications 2
ZW-2
l~~e~
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I Some insulations do not require an outer covering.
2 Where design conditions require maximum conductor operating tempeeatures above 90°C (194°F).
3 For signaling circuits permitting 300-volt insulation.
4 Some rubber insulations do not require an outer covering.
5 Includes integral jacket.
6 For ampacity limitation, see 340.80.
7 Insulation thickness shall be permitted to be 2.03 mm (80 mils) for listed Type USE conductors that have
been subjected to special investigations. The nonmetallic covering over individual rubber-covered conduc­
toes of aluminum-sheathed cable and of lead-sheathed or multiconductor cable shall not be required to be
flame retardant. For Type MC cable, see 330.104. For nonmetallic-sheathed cable, see Article 334, Part III.
For Type UF cable, see Article 340, Part III.
2008 Edition NATIONAL ELECTRICAL CODE 70-143