OM-271 435 Page 15
4-8.
Electrical Service Guide
Failure to follow these fuse and circuit breaker recommendations could create an electric shock or fire hazard. These
recommendations are for a dedicated circuit that applies to the rated output and duty cycle of the welding power source.
In dedicated circuit installations, the National Electrical Code (NEC) allows the receptacle or conductor rating to be less than the rating
of the circuit protection device. All components of the circuit must be physically compatible. See NEC articles 210.21, 630.11, and
630.12.
STR 400
3-Phase
Input Voltage (V)
400
Input Amperes (A) At Rated Output
36
Max Recommended Standard Fuse Rating In Amperes
1
Time-Delay Fuses
2
45
Normal Operating
Fuses3
50
Min Input Conductor Size In mm
2
(AWG)
4
6 (10)
Max Recommended Input Conductor Length In Meters (Feet)
55 (179)
Min Grounding Conductor Size In mm
2
(AWG)
4
6 (10)
** Power cord supplied with the unit is sized for 230V operation. Larger power cord may be required for cable lengths greater than 3 meters.
Consult national and local regulations.
Reference: 2014 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” . See UL 248.
3 “Normal Operating” (general purpose - no intentional delay) fuses are UL class “K5” (up to and including 60 amps), and UL class “H” ( 65 amps 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
310.15(B)(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.
Notes
