Hypertherm HT4100 Plasma Arc Cutting System Operating - Manual (Page 14)

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SAFETY
HT4100 Instruction Manual: Operation
• Ventilate potentially flammable atmospheres before cutting with a plasma system.
Never operate the plasma system in an atmosphere which contains heavy con-
centrations of dust, flammable gas or combustible liquid vapors.
Electric Shock Prevention
All Hypertherm plasma systems use high voltage (up to 280 VDC) to initiate the
plasma arc. Take the following precautions when operating the plasma system:
• Keep your body and clothing dry.
• Do not stand in, sit on or lie on any wet surface when using the plasma system.
• Maintain proper insulation against electrical shock. If you must work in or near a
damp area, use extreme caution. Wear insulated gloves and boots.
• Provide a wall-mounted disconnect switch with proper size fuses close to the
power supply. This switch allows the operator to turn the power supply off quickly
in an emergency situation.
• Conform to all local electrical codes for primary wiring sizes and types.
• Inspect the primary power cord frequently for damage or cracking of the cover.
Bare wiring can kill. Do not use the system with a damaged power cord. If a
power cord is damaged, replace it immediately.
• Inspect the torch leads. Replace if frayed or damaged.
• Never operate the plasma system unless the power supply unit covers are in
place. Exposed power supply connections present a severe electrical hazard.
• Do not pick up the workpiece, including the waste cutoff, while you cut. Leave the
workpiece in place or on the workbench with the work cable attached at all times.
• Before changing the torch parts, disconnect the main power or unplug the power
supply. After changing the torch parts and returning the retaining cap to its
operating position, plug the power supply in again.
• Never bypass or shortcut the safety interlocks.
• Before removing a power supply cover for maintenance, disconnect the main
power at the wall disconnect switch or unplug the power supply. To avoid exposer
to severe electrical hazard, wait five minutes after disconnecting the main power
to allow capacitor discharge to occur.