Welding Cable Amperage Chart
 
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AMPS

100' 150' 200' 250' 300' 350' 400'
100 4 4 2 2 1 1/0 1/0
150 4 2 1 1/0 2/0 3/0 3/0
200 2 1 1/0 2/0 3/0 4/0 4/0
250 1 1/0 2/0 3/0 4/0    
300 1/0 2/0 3/0 4/0      
350 1/0 3/0 4/0        
400 2/0 3/0          
450 2/0 4/0          
500 3/0 4/0          
550 3/0 4/0          
600 4/0 Required Cable Sizes Show in Gauge Numbers
*The total circuit length includes both welding and grounds leads (based on 4-volt drop) 60% duty cycle.
Description
These values for current-carrying capacity are based on a copper temperature of 60C (140F), an ambient temperature of 40C (104F) and yield load factors from approximately 32% for the 2 AWG cable to approximately 23% for the 3/0 AWG cable. In actual service, the load factor may be much higher than indicated without overheating the cable as the ambient temperature will generally be substantially lower than -40C.
Suggested Ampacities
For 600 Volt In-Line Applications
 
AWG Amperes AWG Amperes
4/0 315 1 170
3/0 275 2 150
2/0 235 3 130
1/0 300 4 110
    6 85
Per standards: ICEA S-19-18 NEMA WC-3 Part 8, Appendix J.

Ampacities for portable cable, continuous duty (Ambient Temperature of 40C)