Welding Cable Amperage Chart

 Amps  100 ft  150 ft  200 ft  250 ft  300 ft  350 ft  400 ft
 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            
*The total circuit length includes both welding and grounds leads (based on 4-volt drop) 60% duty cycle.

 

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  AMP  AWG  AMP
 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)

Island Supply Welding Co.
PO Box 580
Grand Island, NE 68802
jwestwood@islandsupplywelding.com
www.islandsupplywelding.com