Internal Wiring Check; Connecting Welding Machine To Line Voltage - Thermal Arc EXCEL-ARC 750 CC Owner's Manual

430429-174
INSTALLATION
RATED
LINE LOAD
VOLTS AMPS
230 110
460 55
575 43
*Conductor size shall be modified as required for line voltage drop and ambient temperature. Sizes
listed for conduit installation are based on 90° C conductor insulation, designated as FEP, FEPB,
RHH, and THHN.
cause painful shock and lead to the erroneous
conclusion that an electrical fault exists in the equip-
ment.
If a system ground is not available, consult the
electrical code enforcement body for instructions.
The welding machine should be connected to an
adequate driven ground rod, or to a water pipe that
enters the ground not more than 10 feet (30 meters)
from the machine.
The equipment grounding conductor size is listed
in Table 4-1 as a guide, if no local or national code
is applicable.
Attach the equipment grounding conductor to the
stud provided on the yoke. Determine that the
ground wire size is adequate before the machine is
operated.
CAUTION: Be sure to replace the cabinet
top to assure adequate internal ventila-
tion and prevent component failure.

Internal Wiring Check

Refer to the product identification plate (name-
plate) on the welding machine's rear panel to deter-
mine the power input voltages and frequency at
which it will be operated.
Remove left side panel for access to Line Voltage
Changeover circuitry. Check line voltage connec-
tions against instructions on Voltage Changeover
Diagram supplied with this manual. If necessary,
rearrange internal wiring and/or link connections.
4-2
APPROX.
LINE
FUSE SIZE
150
75
50
Table 4-1 Recommended Wire and Fuse Size Table
COPPER
LINE WIRE SIZE*
FLEXIBLE
IN CONDUIT CABLE
No. 2 No. 1
No. 6 No. 4
No. 8 No. 6
Connecting Welding Machine to
Line Voltage
The input power should be connected to the unit
through a fused disconnect switch, or other suitable
disconnecting means furnished by the user. A hole
is provided in the rear panel of the machine, near to
the input connections, for the entry of the input
conductors.
DANGER: ELECTRIC SHOCK
CAN KILL. Open the discon-
nect switch, or breaker, and
determine that no voltage is
present, before connecting
wires between welding ma-
chine and power supply.
CAUTION: The method of installation,
conductor size, and overcurrent protec-
tion shall conform to the requirements
of the local electrical code, the National
Electrical Code, or other national codes,
as applicable. All installation wiring and
machine reconnections shall be done
by qualified persons.
Table 4-1 provides minimal information for selec-
tion of line conductors, fuses, and the equipment
grounding conductor. This information is from the
National Electrical Code NFPA 70-1981 Edition.
Install this equipment per the latest edition, avail-
COPPER
GROUNDING
CONDUCTOR
MIN. SIZE
No. 6
No. 8
No. 8
April 7, 1997 Revised