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OM-2221 Page 22
3-15. Electrical Service Guide
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.
Three-Phase, 50/60 Hz Three-Phase, 60 Hz
Input Voltage 380 400 415 500 460 575
Input Amperes At Rated Output 149 141 136 113 123 98
Max Recommended Standard Fuse Rating In Amperes
1
Time-Delay
2
175 175 150 125 150 110
Normal Operating 3 225 200 200 175 175 150
Min Input Conductor Size In AWG 4 1/0 1/0 1/0 2 1 3
Max Recommended Input Conductor Length In Feet (Me-
ters)
398 (121) 441 (134) 474 (145) 490 (149) 482 (147) 548 (167)
Min Grounding Conductor Size In AWG 4 4 6 6 6 6 6
Reference: 2005 National Electrical Code (NEC) (including article 630)
1 If a circuit breaker is used in place of a fuse, choose a circuit breaker with time-current curves comparable to the recommended fuse.
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.