Miller Electric XMT 4-Rack - Manual (Page 15)

Ref. S-0092-G
OM-815 Page 11
Table 4-2. Electrical Service Requirements*
Input Voltage 230 460
Recommended Standard Fuse Or Circuit Breaker Rating In Amperes 1 250 125
Input Conductor Size In AWG/Kcmil 2 1/0 4
Max Input Conductor Length In Feet (Meters) 3 229 (70) 397 (121)
Grounding Conductor Size In AWG/Kcmil 4 4 6
* These values are calculated from the 1993 edition of the National Electrical Code (NEC).
1 Recommended 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
allows fuse or circuit breaker sizing up to 200% of rated input amperage.
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).
SECTION 5 – MAINTENANCE & TROUBLESHOOTING
ELECTRIC SHOCK can kill.
•
Do not touch live electrical parts.
•
Turn Off welding power sources, and disconnect input power to rack before inspecting, maintaining, or servicing.
Maintenance to be performed only by qualified persons.
WARNING
5-1. Routine Maintenance
Turn Off all power before maintaining.
ST-151 267-B
6 Months
OR
During Heavy Service,
Clean Monthly
Blow Out
Or
Vacuum
Inside
– –
3 Months
Tape Or
Replace
Cracked
Cables
Clean
And
Tighten Weld
Connections
Replace
Unreadable
Labels
See
Section
7
Figure 5-1. Maintenance Schedule