Miller MigMatic S400i, Owner'S Manual

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OM-287504 Page 20
4-12. Electrical Service Guide (Three-Phase)
Elec Serv 2020-02
Failure to follow these electrical service guide recommendations could create an electric shock or fire hazard. These recommenda-
tions are for an individual branch circuit sized for the rated output and duty cycle of one welding power source.
In individual branch 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.
CE-marked equipment shall only be used on a supply network that is a three-phase, four-wire system with an earthed neutral.
Actual input voltage should not fall below 340 volts AC or rise above 460 volts AC. If actual input voltage is outside this range, unit may not operate
according to specifications.
Rated Supply Voltage (V)
S400i S400iP S500i
400 400 400
Rated Maximum Supply Current I
1max
(A) 26.0 26.0 38.0
Maximum Effective Supply Current I
1eff
(A) 23.2 23.2 27.2
Max Recommended Standard Fuse Rating In Amperes
1
Time Delay Fuses
2
Normal Operating Fuses
3
30
35 30
35 45
50
Maximum Recommended Supply Conductor Length In Feet (Meters)
4
248 (75) 248 (75) 164 (50)
Raceway Installation
Minimum Supply Conductor Size In AWG (mm
2
)
5
10 (6) 10 (6) 10 (6)
Minimum Grounding Conductor Size In AWG (mm
2
)
5
10 (6) 10 (6) 10 (6)
Reference: 2020 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 Maximum total length of copper input conductors in entire installation, raceway and/or flexible cord.
5 Raceway 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) and is based on allowable ampacities of insulated copper conductors having a temperature rating of 75 ° C (167 ° F) with not
more than three single current − carrying conductors in a raceway.
Notes