Current Carrying Capacities of Multicables
Ampacity and De-Rating Tables for Multicable
Ampacity of Listed Extra-Hard Usage Cords and Cables with Temperature Ratings of 75°C (167°F) and 90° (194°F) From 2002 NEC Table 520-44
|
Size (AWG)
|
Temperature Rating of
Cords and Cables |
Maximum Rating of Overcurrent Devices
|
|
|
75°C (167°F)
|
90°C (194°F)
|
||
|
|
|||
|
14
|
24
|
28
|
15
|
|
12
|
32
|
35
|
20
|
|
10
|
41
|
47
|
25
|
|
8
|
57
|
65
|
35
|
|
6
|
77
|
87
|
45
|
|
4
|
101
|
114
|
60
|
|
2
|
133
|
152
|
80
|
|
|
|||
*Ampacity shown is the ampacity for multiconductor cords and cables where only three copper conductors are current carrying. If the number of current-carrying conductors in a cord or cable exceeds three and the load diversity factor is a minimum 50 percent, the ampacity of each conductor shall be reduced as shown in the following table.
|
De-Rating Table
|
||
|
Number of Conductors
|
Percent of Ampacity Value
|
|
|
|
||
|
4-6
|
80
|
|
|
7-24
|
70
|
|
|
25-42
|
60
|
|
|
43 and above
|
50
|
|
|
|
||
This data is for reference purposes only. TMB assumes no responsibility or liability for the accuracy of this data.