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APPENDIX A: ALLOWABLE AMPACITIES OF INSULATED CONDUCTORS
This appendix provides guidelines for selecting AWG wire size based on the temperature rating
of the conductor and the anticipated load. The information contained is from Table 310-16 of
the National Electrical Code document, ANSI/NPFA 70 (1978).
Note: Information for aluminum conductors has been omitted from the table here
because copper conductors only are recommended for use with the ADC panel.
Table 310-16 (NEC): Allowable Ampacities of Insulated Conductors, Rated O Through 2000 Volts, 60° to
90°C (140° to 194°F), Not More Than Three Current-Carrying Conductors in Raceway or Cable or Earth
(Directly Buried), Based on Ambient Temperature of 30°C (86°F)
SIZE
AWG
60°C
KCMIL
(114°F)
TYPES
TW*,
UF*
18
....
16
....
14
20*
12
25*
10
30
8
40
6
55
4
70
3
85
2
95
1
110
1/0
125
2/0
145
3/0
165
4/0
195
250
215
300
240
350
260
400
280
TEMPERATURE RATING OF CONDUCTOR
60°C
(114°F)
TYPES
FEPW*,
RH*, RHW*,
THHW*,
THW*,
THWN*,
XHHW*,
USE*, ZW*
....
....
20*
25*
35*
50
65
85
100
115
130
150
175
200
230
255
285
310
335
ADCP-80-526 • Issue 6 • December 2006
60°C
(114°F)
TYPES
TBS, SA,
SIS, FEP*,
FEPB*, MI,
RHH*, RHW-2,
THHN*,
THHW*, THW-2*,
THWN-2*,
USE-2,
XHH,
XHHW*
XHHW-2
ZW-2
14
18
25*
30*
40*
55
75
95
110
130
150
170
195
225
260
290
320
350
380
Page 31
© 2006, ADC Telecommunications, Inc.
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