Miller Electric CST 250, Owner'S Manual

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OM-2237 Page 13
3-6. Weld Output Terminals And Selecting Cable Sizes*
Weld Cable Size** and Total Cable (Copper) Length in Weld Circuit
Not Exceeding
100 ft (30 m) Or Less
150 ft
(45 m)
200 ft
(60 m)
250 ft
(70 m)
300 ft
(90 m)
350 ft
(105 m)
400 ft
(120 m)
Weld Output
Terminals
Welding
Amperes***
10 − 60%
Duty
Cycle
60 − 100%
Duty
Cycle
10 − 100% Duty Cycle
100 4 (20) 4 (20) 4 (20) 3 (30) 2 (35) 1 (50) 1/0 (60) 1/0 (60)
150 3 (30) 3 (30) 2 (35) 1 (50) 1/0 (60) 2/0 (70) 3/0 (95 3/0 (95)
200 3 (30) 2 (35) 1 (50) 1/0 (60) 2/0 (70) 3/0 (95) 4/0 (120) 4/0 (120)
250 2 (35) 1 (50) 1/0 (60) 2/0 (70) 3/0 (95) 4/0 (120) 2 ea. 2/0
(2x70)
2 ea. 2/0
(2x70)
Output Receptacles
−
+
300 1 (50) 1/0 (60) 2/0 (70) 3/0 (95) 4/0 (120) 2 ea. 2/0
(2x70)
2 ea. 3/0
(2x95)
2 ea. 3/0
(2x95)
*
This chart is a general guideline and may not suit all applications. If cable overheating occurs (normally you can smell it), use next size larger
cable.
**Weld cable size (AWG) is based on either a 4 volts or less drop or a current density of at least 300 circular mils per ampere.
( ) = mm
2
for metric use
***Select weld cable size for pulsing application at peak amperage value.
S-0007-E − 803 080