quate to carry ground currents safely. Equipment made electrically HOT by stray current may shock, possibly fatally. Do NOT GROUND to electrical conduit, or to a pipe carrying ANY gas or flammable liquid such as oil or fuel.
Before welding, check ground for continuity. Be sure conductors are touching bare metal of equipment frames at connections.
If a line cord with a ground lead is provided with the equipment for connection to a switchbox, connect the ground lead to the grounded switchbox. If a
2.Electrode Holders
Fully insulated electrode holders should be used. Do NOT use holders with protruding screws.
3.Connectors
Fully insulated
4.Cables
Frequently inspect cables for wear, cracks and damage. IMMEDIATELY REPLACE those with excessively worn or damaged insulation to avoid
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 opera- tion.
6.Electrode
a.Equipment with output on/off control (contac- tor)
Welding power sources for use with the gas metal arc welding (GMAW), gas tungsten arc welding (GTAW) and similar processes nor- mally are equipped with devices that permit on- off control of the welding power output. When so equipped the electrode wire becomes elec- trically HOT when the power source switch is ON and the welding gun switch is closed. Never touch the electrode wire or any conducting ob-
ject 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 (SMAW) and similar proc- esses may not be equipped with welding power output
7.Safety Devices
Safety devices such as interlocks and circuit breakers should not be disconnected or shunted out.
Before installation, inspection, or service, of equipment, shut OFF all power and remove line fuses (or lock or
Do not open power circuit or change polarity while weld- ing. If, in an emergency, it must be disconnected, guard against shock burns, or flash from switch arcing.
Leaving equipment unattended. Always shut OFF and disconnect all power to equipment.
Power disconnect switch must be available near the welding power source.
F.Protection For Wearers of Electronic Life Sup- port Devices (Pacemakers)
Magnetic fields from high currents can affect pacemak- er operation. Persons wearing electronic life support equipment (pacemaker) should consult with their doctor before going near arc welding, gouging, or spot welding operations.
1-4. STANDARDS BOOKLET INDEX
For more information, refer to the following standards or their latest revisions and comply as applicable:
1.ANSI Standard Z49.1, SAFETY IN WELDING AND CUTTING obtainable from the American Welding Society, 550 N.W. LeJeune Rd, Miami, FL 33126.
2.NIOSH, SAFETY AND HEALTH IN ARC WELD- ING AND GAS WELDING AND CUTTING ob- tainable from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402.
3.OSHA, SAFETY AND HEALTH STANDARDS, 29CFR 1910, obtainable from the Superinten- dent of Documents, U.S. Government Printing Office, Washington, D.C. 20402.
4.ANSI Standard Z87.1, SAFE PRACTICES FOR OCCUPATION AND EDUCATIONAL EYE AND FACE PROTECTION obtainable from the Ameri- can National Standards Institute, 1430 Broad- way, New York, NY 10018.