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FOR ELECTRICALLY
powered equipment.
8.a. Turn off input power using the disconnect
switch at the fuse box before working on the
equipment.
8.b.Install equipment in accordance with the National Electrical
Code, all local codes and the manufacturer’s
recommendations.
8.c.Ground the equipment in accordance with the National
Electrical Code and the manufacturer’s recommendations.
WELDING SPARKS can
cause fire or explosion
6 a Remove fire hazards from the welding area. If
this is not possible, cover them to prevent the
welding sparks from starting a fire. Remember
that welding sparks and hot materials from
welding can easily go through small cracks and openings to
adjacent areas. Avoid welding near hydraulic lines. Have a fire
extinguisher readily available.
6.b.Where compressed gases are to be used at the job site,
special precautions should be used to prevent hazardous
situations. Refer to AS1674 Parts 1 & 2 “Safety in Welding
and Cutting” (ANSI Standard Z49.1) and the operating
information for the equipment being used.
6.c.When not welding, make certain no part of the electrode
circuit is touching the work or ground. Accidental contact can
cause overheating and create a fire hazard.
6.d.Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapours from substances
inside. These can cause an explosion even though the
vessel has been “cleaned”. For information purchase
“Recommended Safe Practices for the Preparation for
Welding and Cutting of Containers and Piping that have held
Hazardous Substances”, AWS F4.1 from the American
Welding Society (see address above).
6.e.Vent hollow castings or containers before heating, cutting or
welding. They may explode.
6.f. Sparks and spatter are thrown from the welding arc. Wear oil
free protective garments such as leather gloves, heavy shirt,
cuffless trousers, high shoes and a cap over your hair. Wear
ear plugs when welding out of position or in confined places.
Always wear safety glasses with side shields when in a
welding area.
6.g.Connect the work cable to the work as close to the welding
area as possible. Work cables connected to the building
framework or other locations away from the welding area
increase the possibility of the welding current passing
through lifting chains, crane cables or other alternate circuits.
This can create fire hazards or overheat lifting chains or
cables until they fail.
6.h.Also see Item 1c.
CYLINDER may explode
if damaged
7.a. Use only compressed gas cylinders containing
the correct shielding gas for the process used
and properly operating regulators, designed
for the gas and pressure used. All hoses,
fittings, etc. should be suitable for the application and
maintained in good condition.
7.b.Always keep cylinders in an upright position and securely
chained to an undercarriage or fixed support.
7.c.Cylinders should be located :
• Away from areas where they may be struck or subjected to
physical damage.
• A safe distance from arc welding or cutting operations and
any other source of heat, sparks or flame.
7.d.Never allow the electrode, electrode holder, or any other
electrically “hot” parts to touch a cylinder.
7.e.Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.
7.f. Valve protection caps should always be in place and hand-
tight except when the cylinder is in use or connected for use.
7.g.Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publication P-I,
“Precautions for Safe Handling of Compressed Gases in
Cylinders”, available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.
iii SAFETY iii
Mar ‘95