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// CODE SNIPPET

E3705.2 Correction Factor for Ambient Temperatures

Residential Code 2021 of Colorado > 37 Branch Circuit and Feeder Requirements > E3705 Conductor Sizing and Overcurrent Protection > E3705.2 Correction Factor for Ambient Temperatures
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For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities specified in Table E3705.1 by the appropriate correction factor shown in Table E3705.2. [310.15(B)(1)]
TABLE E3705.2 [310.15(B)(1)]
AMBIENT TEMPERATURE CORRECTION FACTORS
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 less
1.29 1.20 1.15 50 or less
11—15
1.22 1.15 1.12 51—59
16—20
1.15 1.11 1.08 60—68
21—25
1.08 1.05 1.04 69—77
26—30
1.00 1.00 1.00 78—86
31—35
0.91 0.94 0.96 87—95
36—40
0.82 0.88 0.91 96—104
41—45
0.71 0.82 0.87 105—113
46—50
0.58 0.75 0.82 114—122
51—55
0.41 0.67 0.76 123—131
56—60
— 0.58 0.71 132—140
61—65
— 0.47 0.65 141—149
66—70
— 0.33 0.58 150—158
71—75
— — 0.50 159—167
76—80
— — 0.41 168—176
81—85
— — 0.29 177—185
For SI: °C = [(°F) — 32]/1.8.

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