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currents to flow through the body. Do not work in damp area without being
extremely careful. Stand on dry rubber mats or dry wood and use insulating
gloves when dampness or sweat cannot be avoided. Keep clothing dry.
3.3.1 Installation and Grounding of Electrically Powered Equipment
Electrical equipment must be installed and maintained in accordance with the
National Electrical Code, NFPA 70, and local codes. A power disconnect switch
must be located at the equipment. Check equipment nameplates for voltage and
phase requirements. If only 3-phase power is available, connect single-phase
equipment to only two wires of the 3-phase line. DO NOT CONNECT the
equipment grounding conductor (lead) to the third live wire of the 3-phase line as
this makes the equipment frame electrically HOT, which can cause fatal shock.
If a grounding lead (conductor) is part of the power supply cable, be sure to
connect it to a properly grounded switch box or building ground. If not part of the
supply cable, use a separate grounding lead (conductor). Do not remove a
ground prong from any plug. Use correct mating receptacles. Check ground for
electrical continuity before using equipment.
3.3.2 Torch and Work Cables
Inspect cables often for damage to the insulation. Replace or repair
cracked or worn cables immediately. Do not use a welding current in
excess of rated cable capacity, as the cable will overheat.
3.3.3 Power Source Output Terminals
The Fronius TPS-450 Power Source completely shields the output
terminals when the Torch and Ground Cables are connected.
3.3.4 Service and Maintenance
Shut OFF all power at the disconnect switch or line breaker before
inspecting or servicing the equipment. Unplug the input power cord. If the
equipment is wired directly to an electrical box. lock the switch OFF (or
remove line fuses) so that power cannot be turned ON accidentally.
Disconnect power to equipment if it is to be left unattended or out of
service.
3.3.5 Fuses and Circuit Breakers
Replace fuses and circuit breakers with equivalent sizes.
3.4 BURN PREVENTION
The welding arc emits high energy radiation in the infrared and ultraviolet range.
This energy penetrates lightweight clothing and is reflected from light-colored
surfaces. The arc rays can injure the eyes permanently and burn the skin, just
as in "sunburn". Never look at an electric arc without eye protection.
