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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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