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INSTALLATION
TECHNICAL SPECIFICATIONS - SQUARE WAVE TIG 255
For all Stick, DC TIG, and Balanced AC TIG
Welding at 255A/30V/40% Duty Cycle
Based on the 1993 US. National
Electrical Code
For Unbalanced AC TIG Welding Above 180
Amps, 255A/16V/40% Duty Cycle, Auto
Balance Based on the 1993 U.S. National
Electrical Code
Code
Number
10022
10023
10024
10452
10453
10451
Volts at Rated Amperes
30
28
26
Auxiliary Power
115 Volts AC, 10 Amps
220Volts AC, 2 Amps
(50/60 Hz. machines only)
Input Current at
Rated Output
(1)
81/74/37
74/37/30
85/77/44
77/45/39
45/41/33
77/45/41
Amps
255
200
150
Constant Open
Circuit Voltage
Stick OCV: 76
TIG OCV: 53
Standard
Voltage
208/230/460/1/60
230/460/575/1/60
200/240/400/1/50/60
220/380/440/1/50/60
380/415/500/1/50/60
220/380/415/1/50/60
Duty Cycle
40% Duty Cycle
NEMA Class II (40)
60% Duty Cycle
100% Duty Cycle
Welding Current Range
(Continuous)
5-315 Amps
AC and DC
INPUT - SINGLE PHASE ONLY
RATED OUTPUT
OUTPUT
RECOMMENDED INPUT WIRE AND FUSE SIZES
Input
Voltage /
Frequency
208/60
230/60
460/60
575/60
200/50/60
220/50/60
380/50/60
400/50/60
415/50/60
440/50/60
500/50/60
Input
Ampere
Rating on
Nameplate
81
74
37
30
85
77
46
43
41
39
34
Type 75°C
Copper Ground
Wire in Conduit
AWG (IEC)
Sizes
6 (16mm
2
)
8 (10mm
2
)
10 (6mm
2
)
10 (6mm
2
)
6 (16mm
2
)
8 (10mm
2
)
8 (10mm
2
)
10 (6mm
2
)
10 (6mm
2
)
10 (6mm
2
)
10 (6mm
2
)
Fuse
(Super Lag)
or Breaker
Size
125
100
50
50
125
100
70
60
60
60
50
Type 75°C
Copper Wire in
Conduit AWG
(IEC) Sizes
6 (16mm
2
)
6 (16mm
2
)
10 (6mm
2
)
10 (6mm
2
)
6 (16mm
2
)
6 (16mm
2
)
8 (10mm
2
)
10 (6mm
2
)
10 (6mm
2
)
10 (6mm
2
)
10 (6mm
2
)
Type 75°C
Copper Ground
Wire in Conduit
AWG (IEC)
Sizes
6 (16mm
2
)
6 (16mm
2
)
10 (6mm
2
)
10 (6mm
2
)
6 (16mm
2
)
8 (10mm
2
)
8 (10mm
2
)
10 (6mm
2
)
10 (6mm
2
)
10 (6mm
2
)
10 (6mm
2
)
Type 75°C
Copper Wire in
Conduit AWG
(IEC) Sizes
4 (25mm
2
)
4 (25mm
2
)
8 (10mm
2
)
10 (6mm
2
)
4 (25mm
2
)
4 (25mm
2
)
8 (10mm
2
)
8 (10mm
2
)
8 (10mm
2
)
8 (10mm
2
)
10 (6mm
2
)
Input
Amperes
102
92
46
37
105
96
55
53
51
48
42
Height Width Depth Weight
30.5 in. 19.0 in. 30.0 in.
(Lift bail, add 3.5 in) 300 lbs
(137 kg)
775 mm 485 mm 760 mm
(Lift bail, add 90 mm)
PHYSICAL DIMENSIONS
(1)
Unbalanced TIG welding above 180 amps will draw higher input currents; see Supply Connections section.