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5-9. 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 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.
60 Hertz Models
Input Voltage (V)
Input Amperes (A) At Rated Output
Max Recommended Standard Fuse Rating In
1
Amperes
Time-Delay Fuses
Normal Operating Fuses 3
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.
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.
50 Hertz Models
Input Voltage (V)
Input Amperes (A) At Rated Output
Max Recommended Standard Fuse Rating In Am-
1
peres
Normal Operating Fuses 3
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.
OM-223 Page 20
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A complete Parts List is available at www.MillerWelds.com
300 Amp Model
200
230
48
42
2
60
50
70
60
4
8
8
111
147
(34)
(45)
4
8
10
300 Amp Model
380
27
2
Time-Delay Fuses
30
40
4
10
268
(82)
4
10
450 Amp Model
460
575
200
230
21
17
72
63
25
20
90
70
30
25
110
90
10
12
4
6
393
374
163
142
(120)
(114)
(50)
(43)
10
12
6
8
450 Amp Model
400
440
380
400
25
23
39
37
30
25
45
45
35
35
60
50
10
10
8
8
297
359
250
277
(90)
(109)
(76)
(84)
10
10
10
10
Elec Serv 2011−08
650 Amp Model
460
575
230
460
32
25
96
48
40
30
110
60
45
40
150
70
8
10
3
8
366
379
166
228
(112)
(115)
(51)
(70)
10
10
6
8
650 Amp Model
440
380
400
33
58
54
40
70
60
50
90
80
8
6
6
335
243
269
(102)
(74)
(82)
10
8
8
575
38
45
60
8
357
(109)
10
440
50
60
80
6
325
(99)
8