Chapter 3 Wiring Methods and Materials

ARTICLE 310 -
CONDUCTORS FOR GENERAL WIRING
310.13
These conductors shall be permitted for use in any of
the wiring methods recognized in Chapter 3 and as speci­
fied in their respective tables or as permitted elsewhere in
this Code.
to pressure, such as at points of support. Thermoplastic
insulation, where used on dc circuits in wet locations, may
result in electroendosmosis between conductor and
insulation.
FPN: Thermoplastic insulation may stiffen at temperatures
lower than -lODe (+14°P). Thermoplastic insulation may
also be deformed at normal temperatures where subjected
Table 310.13{'> Conductor Applications and Insulations ~!'.Jli"
Trade Name
Type Letter
Maximum Operating
Temperature Application Provisions Insulation
Thickness of Insulation
AWG orkcmil mm mils
Outer Covering'
Fluorinated FEPor 90°C Dry and damp locations Fluorinated ethylene 14-10 0.51 20 None
ethylene FEPB 194°F propylene 8-2 0.76 30
propylene
200°C Dry locations - special Fluorinated ethylene 14-8 0.36 14 Glass braid
392°F applications' propylene
6-2 0.36 14 Glass or other suitable
hraid materi al
Mineral insulation MI 90°C Dry and wet locations Magnesium oxide 18-16 3 0.58 23 Copper or alloy steel
(metal sheathed) 194°F 16-10 0.9\ 36
250°C For special applications' 9-4 1.27 50
482°F 3-500 1.40 55
Moisture-, heat-, MTW 60°C Machine tool wiring in Flame-retardant (A) (A) (A) None
and oil-resistant 140°F wet locations moisture-, heat-, and (B) Nylon jacket or
thermoplastic
oil-resistant
equivalent
90°C
194°F
thermoplastic 22-12
10
0.76
0.76
Machine tool wiring in
dry locations.
FPN: See NFPA 79.
30
30
8
1.14 45
6 1.52 60
4-2 1.52 60
1-4/0 2.03 80
213-500 2.41 95
501-1000 2.79 110
Paper 85°C For underground service Paper Lead sheath
185°F conductors. or by special
permission
Perfluoro-alkoxy PFA 90°C
194°F
200°C
392°F
Perfluoro-alkoxy PFAH 250°C
482°F
Dry and damp locations Perfluoro-alkoxy 14-10
8-2
0.51
0.76
20
30
Dry locations - special
1-410 1.14 45
applications'
Dry locations only. Only
for leads within apparatus
or within raceways
connected to apparatus
(nickel or nickel-coated
copper only)
PerIluoro-alkoxy 14-10
8--2
1-410
0.51
0.76
1.14
20
30
45
None
None
Thermoset RHH 90°C
. 194°F
Dry and damp locations 14-10
8--2
1-410
213-500
501-1000
1001-2000
1.14
1.52
2.03
2.41
2.79
3.18
45
60
80
95
110
125
Moisture-resistant,
flame-retardant,
nonmetallic covering I
Moistureresistant
thermoset
.
RHW 4 75°C
167°F
RHW-2
!lQ!?C
}94~f
Dry and wet locations
Flame-retardant,
moistureresistant
thermoset
14-10
8--2
1-4/0
213-500
501-1000
1001-2000
1.14
1.52
2.03
2.41
2.79
3.18
45
60
80
95
110
125
Moisture-resistant,
flame-retardant,
nonmetallic covering 4
Silicone SA 90°C
194°F
200°C
392°F
Dry and damp locations Silicone rubber 14-10
8-2
1-410
For special application' 213-500
501-1000
1.14
1.52
2.03
2.4\
2.79
45
60
80
95
110
1001-2000 3.18 125
Glass or other suitable
braid material
(Continues)
2008 Edition NATIONAL ELECTRICAL CODE 70-141