Ampacity Ratings

Definition:
Ampacity or Current Carrying Capacity is determined by the Cross Sectional Area and composition of the conductor, the ambient temperature and the maximum allowable increase in temperature of the insulation.

Ambient Temperature:

The Figures below are based on an Ambient Temperature of 30ÂșC and the maximum operating temperature of the Insulation system.

Bundling:
Ampacity Ratings must be reduced when two or more wires are bundled together (See Chart Below)

AWG 80°C 90°C 105°C 125°C 200°C
30 2 3 3 3 4
28 3 4 4 5 6
26 4 5 5 6 7
24 6 7 7 8 10
22 8 9 10 11 13
20 10 12 13 14 17
18 15 17 18 20 24
16 19 22 24 26 32
14 27 30 33 40 45
12 36 40 45 50 55
10 47 55 58 70 75
8 65 70 75 90 100
6 95 100 105 125 135
4 125 135 145 170 180
2 170 180 200 225 240

 

De-Rating Factors:

No. of WiresFactor
2 to 5x 0.8
6 to 15x 0.7
16 to 30x 0.5