Chapter 3 Wiring Methods and Materials

310.13 ARTICLE 310 - CONDUCTORS FOR GENERAL WIRING
Table 310.13(B) Thickness of Insulation for Nonshielded
Types RHH and RHW Solid Dielectric Insulated Conductors
Rated 2000 Volts .
Column Al Column B 2
Conductor Size
(AWG or kcmil) 0101 mils 0101 mils
14-10 2,03 80 1.52 60
8 2,03 80 1.78 70
6-2 2.41 95 1.78 70
1-2/0 279 110 2.29 90
3/0-4/0 2,79 110 2.29 90
213-500 3,18 125 2.67 105
501-1000 3,56 140 3.05 120
1001-2000 3.56 140 3.56 140
'Column A insulations are limited to natural, SBR, and butyl rubbers.
2Column B insulations are materials such as cross-linked polyethylene,
ethylene propylene rubber, and composites thereof.
Table 310.13(C) Conductor Application and Insulation RIJted200~VoM!l~''''er
Trade Maximum Operating Application
Name Type Letter Temperature Provision Insulation Outer Covering
Medium voltage solid MV-90 90°C 105°C Dry or wet locations Thenno- Jacket, sheath, or
dielectric MV-105* plastic or thenno­ annor
setting
*Where design conditions require maximum conductor temperatures above 90°C.
Table 310.13(D) Thickness of IDsulation and Jacket for Nonshielded Solid Dielectric ~tldCondw:totstitecl~VoUs
Dry Locations, Single Conductor
Without
With Jacket
Jacket
Insulation Insulation Jacket
Conductor Size
(AWG or kcmil) mOl mils 0101 mils 0101 mils
8 2.79 110 2.29 90 0.76 30
6 2.79 110 2.29 90 0.76 30
4-2 2.79 110 2.29 90 I 14 45
1-2/0 2.79 110 2.29 90 1.14 45
3/0-4/0 2.79 110 2.29 90 1.65 65
213-500 3.05 120 2.29 90 I .65 65
501-750 3.30 130 2.29 90 1.65 65
751-1000 3.30 130 2.29 90 1.65 65
1001....1250 3.56 .140 ~,~~ IJI 1i~~ 65
12jjl"..,II00 3:16 140 2,92 1'15 2ia $0
1501-2000 3.56 140 2.92 1.15 2$03 80
*Under a common overall coveIing such as a jacket, sheath, or armor.
70-144
NATIONAL ELECTRICAL CODE
2008 Edition