Table 310.15(B)(2)(a) — Ambient Temperature Correction Factors

Ambient Temperature Correction Factors Based on 30°C (86°F)

For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities specified in the ampacity tables by the appropriate correction factor shown below.

Ambient
Temperature (°C)
Temperature Rating of Conductor Ambient
Temperature (°F)
60°C 75°C 90°C
10 or less1.291.201.1550 or less
11-151.221.151.1251-59
16-201.151.111.0860-68
21-251.081.051.0469-77
26-301.001.001.0078-86
31-350.910.940.9687-95
36-500.820.880.9196-104
41-450.710.820.87105-113
46-500.580.750.82114-122
51-550.410.670.76123-131
56-600.580.71132-140
61-650.470.65141-149
66-700.330.58150-158
71-750.50159-167
76-800.41168-176
81-850.29177-185

DISCLAIMER: All tables on this site are based on the 2011 National Electric Code. The law under your local jurisdiction may be different than what is presented here. Check your local jurisdiction's laws before attempting to do electrical work.

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