Miller Electric XMT 4-Rack manual Common Work Connections

The following procedure is for

Electrode Positive welding 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 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.

ST-155 335 / Ref. ST-154540-A

4-4. Common Work Connections

WARNING

ELECTRIC SHOCK can kill.		ARCING can burn skin or damage
•	Do not touch live electrical parts.	electrical equipment.
• Turn Off welding power sources by placing Power		• Do not change position		of the	welding cable
	circuit breakers in the Off position before making any	connectors while welding.
		• Be sure the connectors are secure in receptacles
•	weld output connections.
	Do not connect welding output of different polarities	before welding.
•	to the same structure.	INADEQUATE	WORK		CABLE
	See ANSI Z49.1 and OSHA Title 29, Chapter XVII,	CONNECTIONS	can	cause serious
	Part 1910, Subpart Q (addresses at beginning of	damage to input power service and
•	manual).	create a hazardous condition.
	Do not handle or come in contact with two live	• Connect an electrical cable of			adequate size
	electrodes at the same time.
		between the isolated terminal and the workpiece
		whenever any welding power sources are
		connected to the isolated terminal.

3

2

5

4

2 4

3

GTAW		GTAW
GMAW
		GMAW
SMAW	1
		SMAW

Figure 4-4. Common Work Connections

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