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welding-cable-ampacities

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Welding Cable Ampacities
Required Cable Sizes:
• For Arc Welding Cable Applications
• Length in feet for total circuit* for secondary voltage ONLY
(Do not use this table for 600 volt applications)
Amps
100’
150’
200’
250’
300’
350’
400’
100
150
200
250
300
350
400
450
500
550
600
4
4
2
1
1/0
1/0
2/0
2/0
3/0
3/0
4/0
4
2
1
1/0
2/0
3/0
3/0
4/0
4/0
4/0
-
2
1
1/0
2/0
3/0
4/0
-
2
1/0
2/0
3/0
4/0
-
1
2/0
3/0
4/0
-
1/0
3/0
4/0
-
1/0
3/0
4/0
-
* The total circuit length includes both welding and ground 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 factor of approximately 32% from the 2 AWG
cable, approximately 23% for the 3/0 AWG cable and higher for the smaller sizes.
The sizes of cables generally used ranged from 2 AWG to 3/0 AWG. In actually 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
3/0
2/0
1/0
-
315
275
235
200
-
1
2
3
4
6
170
150
130
110
85
Per standards: ICEA S-19-81
NEMA WC-3 Part 8, Appendix J
Ampacities for portable cable, continuous duty (Ambient Temperature of 40C)
IEWC • 5001 S. Towne Drive, New Berlin, WI 53151 | Toll-Free: 800-344-2323 | Web: www.iewc.com
IEWC assumes no responsibility for the use of, or reliance on the information provided herein and disclaims all liability for any and all damages arising out of the use of, or reliance on, this information.
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