Symbol Usage; Plasma Arc Cutting Hazards - Miller Spectrum 300 Manuel Du Propriétaire

SECTION 1 − SAFETY FOR PLASMA ARC CUTTING
OM-2210B − 5/97

1-1. Symbol Usage

Means Warning! Watch Out! There are possible hazards with this
procedure! The possible hazards are shown in the adjoining symbols.

1-2. Plasma Arc Cutting Hazards

WARNING
The symbols shown below are used throughout this manual to call attention to and identify possible
hazards. When you see the symbol, watch out, and follow the related instructions to avoid the hazard. The
safety information given below is only a summary of the more complete safety information found in the
Safety Standards listed in Section 1-4. Read and follow all Safety Standards.
Only qualified persons should install, operate, maintain, and repair this unit.
During operation, keep everybody, especially children, away.
CUTTING can cause fire or explosion.
Hot metal and sparks blow out from the cutting arc.
The flying sparks and hot metal, hot workpiece, and
hot equipment can cause fires and burns. Check
and be sure the area is safe before doing any cutting.
1. Protect yourself and others from flying sparks and hot metal.
2. Do not cut where flying sparks can strike flammable material.
3. Remove all flammables within 35 ft (10.7 m) of the cutting arc. If
this is not possible, tightly cover them with approved covers.
4. Be alert that sparks and hot materials from cutting can easily go
through small cracks and openings to adjacent areas.
5. Watch for fire, and keep a fire extinguisher nearby.
6. Be aware that cutting on a ceiling, floor, bulkhead, or partition can
cause fire on the hidden side.
ELECTRIC SHOCK can kill.
Touching live electrical parts can cause fatal shocks
or severe burns. The torch and work circuit is
electrically live whenever the output is on. The input
power circuit and machine internal circuits are also
live when power is on. Plasma arc cutting requires
higher voltages than welding to start and maintain
the arc (200 to 400 volts dc are common), but also uses torches
designed with safety interlock systems which turn off the machine
when the shield cup is loosened or if tip touches electrode inside the
nozzle. Incorrectly installed or improperly grounded equipment is a
hazard.
1. Do not touch live electrical parts.
2. Wear dry, hole-free insulating gloves and body protection.
3. Insulate yourself from work and ground using dry insulating mats
or covers big enough to prevent any physical contact with the
work or ground.
4. Do not touch torch parts if in contact with the work or ground.
5. Turn off power before checking, cleaning, or changing torch
parts.
6. Disconnect input power before installing or servicing this
equipment. Lockout/tagout input power according to OSHA CFR
1910.147 (see Safety Standards).
7. Properly install and ground this equipment according to its
Owner's Manual and national, state, and local codes.
FLYING SPARKS AND HOT METAL
can cause injury.
Sparks and hot metal blow out from the cutting arc.
Chipping and grinding cause flying metal.
This group of symbols means Warning! Watch Out! possible ELECTRIC SHOCK, MOVING PARTS,
and HOT PARTS hazards. Consult symbols and related instructions below for necessary actions to
avoid the hazards.
7. Do not cut on closed containers such as tanks or drums.
8. Connect work cable to the work as close to the cutting area as
9. Never cut containers with potentially flammable materials inside
10. Do not cut in atmospheres containing explosive dust or vapors.
11. Do not cut pressurized cylinders, pipes, or vessels.
12. Do not cut containers that have held combustibles.
13. Wear oil-free protective garments such as leather gloves, heavy
14. Do not locate unit on or over combustible surfaces.
15. Remove any combustibles, such as a butane lighter or matches,
8. Check and be sure that input power cord ground wire is properly
9. When making input connections, attach proper grounding
10. Frequently inspect input power cord for damage or bare wiring −
11. Turn off all equipment when not in use.
12. Inspect and replace any worn or damaged torch cable leads.
13. Do not wrap torch cable around your body.
14. Ground the workpiece to a good electrical (earth) ground if
15. Use only well-maintained equipment. Repair or replace damaged
16. Wear a safety harness if working above floor level.
17. Keep all panels and covers securely in place.
18. Do not bypass or try to defeat the safety interlock systems.
19. Use only torch(es) specified in Owner's Manual.
20. Keep away from torch tip and pilot arc when trigger is pressed.
21. Clamp work cable with good metal-to-metal contact to workpiece
1. Wear approved face shield or safety goggles with side shields.
2. Wear proper body protection to protect skin.
3. Wear flame-resistant ear plugs or ear muffs to prevent sparks
Y Marks a special safety message.
.
Means NOTE; not safety related.
practical to prevent cutting current from traveling long, possibly
unknown paths and causing electric shock and fire hazards.
− they must be emptied and properly cleaned first.
shirt, cuffless trousers, high shoes, and a cap.
from your person before doing any cutting.
connected to ground terminal in disconnect box or that cord plug
is connected to a properly grounded receptacle outlet − always
verify the supply ground.
conductor first.
replace cord immediately if damaged − bare wiring can kill.
required by codes.
parts at once.
(not piece that will fall away) or worktable as near the cut as
practical.
from entering ears.
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