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3-11. Electrical Service Guide For CST 250 Racks
Failure to follow these electrical service guide recommendations could create an electric shock or fire hazard. These recommenda-
tions are for a dedicated circuit sized for 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.
Input Voltage
Input Amperes At Rated Output
Max Recommended Standard Fuse Rating In Amperes
Time-Delay
Normal Operating 3
Min Input Conductor Size In AWG
Max Recommended Input Conductor Length In Feet (Meters)
Min Grounding Conductor Size In AWG
3-12. Electrical Service Guide For CST 280 Racks
Input Voltage
Input Amperes At Rated Output
Max Recommended Standard Fuse Rating In Amperes
Time-Delay
Normal Operating 3
Min Input Conductor Size In AWG
Max Recommended Input Conductor Length In Feet (Meters)
Min Grounding Conductor Size In AWG
3-13. Electrical Service Guide For Maxstar 200 Racks
Input Voltage
Input Amperes At Rated Output
Max Recommended Standard Fuse Rating In Amperes
Min Input Conductor Size In AWG
Max Recommended Input Conductor Length In Feet (Meters)
Min Grounding Conductor Size In AWG
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.
1
2
1
2
1
2
Time-Delay
Normal Operating 3
50/60 Hz Three Phase
220
230
400
129
122
73
150
125
80
200
175
110
3
3
6
135
126
249
(41)
(38)
(76)
3
3
6
50/60 Hz Three Phase
220
230
400
137
134
79
175
150
90
225
200
125
3
3
8
119
130
142
(36)
(39)
(43)
4
6
8
Elec Serv 2014−01
440
460
575
67
59
47
80
70
50
100
90
70
6
8
8
198
220
343
(60)
(67)
(105)
6
8
8
Elec Serv 2011−08
440
460
575
72
70
57
80
80
60
110
100
80
8
8
8
171
187
293
(52)
(57)
(89)
8
8
8
Elec Serv 2011−08
50/60 Hz Three Phase
230
460
74
36
90
45
110
50
6
10
71
186
(22)
(57)
6
10
OM-2238 Page 19
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