Electrical Service Requirements For 750 Ampere Models; Section 4 - Operation; Controls; Safety Equipment - Miller Electric GPS-500 Owner's Manual

3-10. Electrical Service Requirements For 750 Ampere Models*

Input Voltage
Input Amperes At Rated Output
Circuit Breaker Size In Amperes
1
Fuse Size In Amperes
Input Conductor Size In AWG/Kcmil
Maximum Input Conductor Length In Feet (Meters)
Grounding Conductor Size In AWG/Kcmil
*
These values are calculated from the 1996 edition of the National Electrical Code (NEC).
1 Standard fuse or circuit breaker size is that closest to 150% of rated input amperage of the welding power source (Article 630-12(a) of NEC).
2 Input conductor size is for insulated copper wire with 75 C rating with not more than three single current-carrying conductors in a cable or raceway
(Table 310-16 of NEC).
3 Maximum length is to prevent more than a 3% voltage drop between service entrance and input terminals of the welding power source (Articles
210-19(a) and 215-2(b) of NEC).
4 The grounding conductor shall be colored or identified as specified in the NEC. Grounding conductor size for copper wire is not required to be larger
than input conductor (Article 250-95 of NEC).

4-1. Controls

4-2. Safety Equipment

OM-266 Page 16
1
2
3
4
SECTION 4 – OPERATION
1 2
1 2
230
164
250
250
2/0
187 (57)
4
3 4 5
3
460 575
82 66
125 100
125 100
4 4
270 (82) 421 (128)
6 8
1 Voltmeter
2 Ammeter
3 Pilot Light
4 Circuit Breaker (See Section
5-2)
5 Power Control Push Buttons
Ref. ST-158 378
1 Insulating Gloves
2 Safety Glasses With Side
Shields
3 Welding Helmet
Wear dry insulating gloves, safety
glasses with side shields, and a
welding helmet with a correct shade
of filter (see ANSI Z49.1).
sb3.1 10/91
S-0092-E