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OM-2251 Page 16
4-5. Electrical Service Guide
NOTICE − INCORRECT INPUT POWER can damage this welding power source. Phase to ground voltage shall not exceed +10% of rated input
voltage.
NOTICE − Actual input voltage should not be 10% less than minimum and/or 10% more than maximum input voltages listed in table. If actual input
voltage is outside this range, output may not be be available.
Failure to follow these electrical service guide recommendations could create an electric shock or fire hazard. These recommenda-
tions are for a dedicated branch circuit sized for the rated output and duty cycle of the welding power source.
Single-Phase
Input Voltage 208 230 400 460 575
Input Amperes At Rated Output 60.8 54.6 29.7 25.4 19.9
Max Recommended Standard Fuse Rating In Amperes
1
Time-Delay
2
70 60 35 30 25
Normal Operating
3
80 80 45 40 30
Min Input Conductor Size In AWG/Kcmil
4
8 8 10 12 12
Max Recommended Input Conductor Length In Feet (Meters)
72
(22)
89
(27)
176
(54)
140
(43)
219
(67)
Min Grounding Conductor Size In AWG/Kcmil
4
8 8 10 12 12
Three-Phase
Input Voltage 208 230 400 460 575
Input Amperes At Rated Output 40.4 36.1 20.6 17.8 14.1
Max Recommended Standard Fuse Rating In Amperes
1
Time-Delay
2
45 40 25 20 15
Normal Operating
3
60 50 30 25 20
Min Input Conductor Size In AWG/Kcmil
4
8 10 12 14 14
Max Recommended Input Conductor Length In Feet (Meters)
119
(36)
96
(29)
175
(53)
150
(46)
234
(71)
Min Grounding Conductor Size In AWG/Kcmil
4
10 10 12 14 14
Reference: 2005 National Electrical Code (NEC) (includes article 630)
1 Consult factory for circuit breaker applications.
2 “Time-Delay” fuses are UL class “RK5” .
3 “Normal Operating” (general purpose - no intentional delay) fuses are UL class “K5” (up to and including 60 amp), and UL class “H” (65 amp and
above).
4 Conductor data in this section specifies conductor size (excluding flexible cord or cable) between the panelboard and the equipment per NEC Table
310.16. If a flexible cord or cable is used, minimum conductor size may increase. See NEC Table 400.5(A) for flexible cord and cable requirements.