Common Work Connections - Miller Electric XMT 4-Rack Owner's Manual

4-4. Common Work Connections

WARNING
ELECTRIC SHOCK can kill.
Do not touch live electrical parts.
Turn Off welding power sources by placing Power
circuit breakers in the Off position before making any
weld output connections.
Do not connect welding output of different polarities
to the same structure.
See ANSI Z49.1 and OSHA Title 29, Chapter XVII,
Part 1910, Subpart Q (addresses at beginning of
manual).
Do not handle or come in contact with two live
electrodes at the same time.
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Figure 4-4. Common Work Connections
ARCING can burn skin or damage
electrical equipment.
Do not change position of the welding cable
connectors while welding.
Be sure the connectors are secure in receptacles
before welding.
INADEQUATE
CONNECTIONS
damage to input power service and
create a hazardous condition.
Connect an electrical cable of adequate size
between the isolated terminal and the workpiece
whenever any welding power sources are
connected to the isolated terminal.
The following procedure is for
Electrode
connections.
1 Positive (+) Weld Output
Cables
Determine cable lengths and sizes
according to welding power source
Owner's Manual.
2 Isolated Terminal
3 Negative (–) Weld Output
Cables
Determine cable sizes according to
welding power source Owner's
Manual. Cable must reach from
negative (–) output receptacle to
isolated terminal.
4 Common Negative (–) Weld
Output Cable
Cable must be able to carry com-
bined weld output of all welding
power sources using common work
connections. Use Table 4-1 to se-
lect proper cable size.
5 Terminal Lugs
Use lugs of proper amperage ca-
pacity and hole size for connecting
to isolated terminal.
For Electrode Negative, reverse
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cable connections. Positive (+)
weld output cables connect to iso-
lated terminal, negative (–) weld
output cables go to electrode. Com-
mon weld output cable is positive.
WORK CABLE
can cause serious
Positive welding
ST-155 335 / Ref. ST-154 540-A