Cut Sheet

Ampacity Correction Factors
Ambient For ambient temperatures other than 30˚C (86˚F), multiply the Ambient
˚C ampacities shown above by the appropriate factor shown below. ˚F
Temp ˚F Temp ˚F
75˚C 90˚C
21-25 1.05 1.04 70-77
26-30 1.00 1.00 78-86
31-35 .94 .96 87-95
36-40 .88 .91 96-104
41-45 .82 .87 105-113
46-50 .75 .82 114-122
51-55 .67 .76 123-131
56-60 .58 .71 132-140
61-70 .33 .58 141-158
71-80 – .41 159-176
NOTES:
1. Ampacities are based on conductor operating temperatures only and do not take voltage drop into consideration.
2. A neutral conductor which carries only the unbalanced current from other conductors, as in the case of normally balanced circuits of three or more conductors,
shall not be counted in determining Ampacity Adjustment Factors. But in a three-wire circuit consisting of two phase wires and the neutral of a four-wire three-phase
Wye-connected system, a common conductor carries approximately the same current as the other conductors and shall be counted in determining ampacities.
3. Based on Ambient Air Temperature of 30°C (86°F).
4. See termination provisions for conductor sizing as given in Underwriters Laboratories Electrical Construction Materials Directory, "Equipment for
Use in Ordinary Locations."
STABILOY
®
SEU and SER Ampacities and Correction Factors
SIZE AWG Dwelling Service and Feeders Applications other than Dwelling Units SIZE AWG
or kcmil per NEC Table 310.15(B)(6) per NEC Table 310.16 or kcmil
75° C 90° C
8- 40458
6- 50606
4- 65754
2 100 90 100 2
1 110 100 115 1
1/0 125 120 135 1/0
2/0 150 135 150 2/0
3/0 175 155 175 3/0
4/0 200 180 205 4/0
250 225 205 230 250
300 250 230 255 300