Tweco 400 XT Ultra-Cut Plasma Cutting System - Manual (Page 10)

ULTRA-CUT 400 XT
1-2 GENERAL INFORMATION Manual 0-5275
ELECTRIC SHOCK
Electric Shock can injure or kill. The plasma arc process uses
and produces high voltage electrical energy. This electric en-
ergy can cause severe or fatal shock to the operator or others
in the workplace.
• Never touch any parts that are electrically “live” or “hot.”
• Wear dry gloves and clothing. Insulate yourself from the
work piece or other parts of the welding circuit.
• Repair or replace all worn or damaged parts.
• Extra care must be taken when the workplace is moist
or damp.
• Install and maintain equipment according to NEC code,
refer to item 9 in Subsection 1.03, Publications.
• Disconnect power source before performing any service
or repairs.
• Read and follow all the instructions in the Operating
Manual.
FIRE AND EXPLOSION
Fire and explosion can be caused by hot slag, sparks, or the
plasma arc.
• Be sure there is no combustible or flammable material
in the workplace. Any material that cannot be removed
must be protected.
• Ventilate all flammable or explosive vapors from the
workplace.
• Do not cut or weld on containers that may have held
combustibles.
• Provide a fire watch when working in an area where fire
hazards may exist.
• Hydrogen gas may be formed and trapped under alu-
minum workpieces when they are cut underwater or
while using a water table. DO NOT cut aluminum alloys
underwater or on a water table unless the hydrogen gas
can be eliminated or dissipated. Trapped hydrogen gas
that is ignited will cause an explosion.
NOISE
Noise can cause permanent hearing loss. Plasma arc processes
can cause noise levels to exceed safe limits. You must protect
your ears from loud noise to prevent permanent loss of hearing.
• To protect your hearing from loud noise, wear protec-
tive ear plugs and/or ear muffs. Protect others in the
workplace.
• Noise levels should be measured to be sure the decibels
(sound) do not exceed safe levels.
• For information on how to test for noise, see item 1 in
Subsection 1.03, Publications, in this manual.
PLASMA ARC RAYS
Plasma Arc Rays can injure your eyes and burn your skin. The
plasma arc process produces very bright ultra violet and infra
red light. These arc rays will damage your eyes and burn your
skin if you are not properly protected.
• To protect your eyes, always wear a welding helmet or
shield. Also always wear safety glasses with side shields,
goggles or other protective eye wear.
• Wear welding gloves and suitable clothing to protect your
skin from the arc rays and sparks.
• Keep helmet and safety glasses in good condition. Re-
place lenses when cracked, chipped or dirty.
• Protect others in the work area from the arc rays. Use
protective booths, screens or shields.
• Use the shade of lens as suggested in the following per
ANSI/ASC Z49.1:
Minimum Protective Suggested
Arc Current Shade No. Shade No.
Less Than 300* 8 9
300 - 400* 9 12
400 - 800* 10 14
* These values apply where the actual arc is clearly
seen. Experience has shown that lighter filters may
be used when the arc is hidden by the workpiece.
!
WARNING
WARNING: This product contains chemicals,
including lead, known to the State of California to
cause birth defects and other reproductive harm.
Wash hands after handling.