Specifications

10
body surface electrical resistance, enabling dangerous and possibly lethal
currents to flow through the body.
1) EARTHING THE EQUIPMENT
When arc welding equipment is earthed according to the National Electrical
Code, and the work is earthed, a voltage may exist between the electrode
and any conducting object.
Examples of conducting objects include, but are not limited to, buildings,
electrical tools, work benches, welding power source cases, workpieces, etc.
Never touch the electrode and any metal object unless the welding power
source is off. When installing, connect the frames of each unit such as welding
power source, control, work table, and water circulator to the building earth.
Conductors must be adequate to carry earth currents safely. Equipment
made electrically LIVE by stray current may shock, possibly fatally. Do NOT
EARTH to electrical conduit, or to a pipe carrying ANY gas or a flammable
liquid such as oil or fuel.
2) ELECTRODE HOLDERS
Fully insulated electrode holders should be used. Do NOT use holders with
protruding screws or with any form of damage.
3) CONNECTORS
Fully insulated lock-type connectors should be used to join welding cable.
4) CABLES
Frequently inspect cables for wear, cracks and damage. IMMEDIATELY
REPLACE those with excessively worn or damaged insulation to avoid possibly
lethal shock from bared cable. Cables with damaged areas may be taped to
give resistance equivalent to original cable. Keep cable dry, free of oil and
grease, and protected from hot metal and sparks.
5) TERMINALS AND OTHER EXPOSED PARTS
Terminals and other exposed parts of electrical units should have insulating
covers secured before operation.
6) ELECTRODE
a. Equipment with output on/off control (contactor)
Welding power sources for use with the gas metal arc welding, gas
tungsten arc welding and similar processes normally are equipped with
devices that permit on/off control of the welding power output. When so
equipped the electrode wire becomes electrically LIVE when the power
source switch is ON and welding gun switch is closed. Never touch the
electrode wire or any conducting object in contact with the electrode
circuit unless the welding power source is off.
b. Equipment without output on/off control (no contactor)
Welding power sources used with shielded metal arc welding and similar