MK Products Positioner #2 - Manual (Page 4)

equipment can fatally shock a person whose body becomes a conductor. DO NOT STAND, SIT, LIE, LEAN
ON, OR TOUCH a wet surface when welding without suitable protection.
To protect against shock:
Keep body and clothing dry. Never work in damp area without adequate insulation against electrical shock.
Stay on a dry duckboard, or rubber mat when dampness or sweat cannot be avoided. Sweat, sea water,
or moisture between body and an electrically HOT part - or grounded metal - reduces the body surface
electrical resistance, enabling dangerous and possibly lethal currents to flow through the body.
1. Grounding the Equipment
When installing, connect the frames of each unit such as welding power source, control, work table, and
water circulator to the building ground. Conductors must be adequate to carry ground currents safely.
Equipment made electrically HOT by stray currents may shock, possibly fatally. Do NOT GROUND to
electrical conduit, or to a pipe carrying ANY gas or a flammable liquid such as oil or fuel.
Three-phase connection. Check phase requirement of equipment before installing. If only three-phase
power is available, connect single-phase equipment to only two wires of the three-phase line. Do NOT
connect the equipment ground lead to the third (live) wire, or the equipment will become electrically HOT
- a dangerous condition that can shock, possibly fatally.
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 switch box, connect the
ground lead to the grounded switch box. If a three-prong plug is added for connection to a grounded mating
receptacle, the ground lead must be connected to the ground prong only. If the line cord comes with a three-
prong plug, connect to a grounded mating receptacle. Never remove the ground prong from a plug, or use
a plug with a broken ground prong.
2. Connectors
Fully insulated lock-type connectors should be used to join welding cable lengths.
3. 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.
4. Terminals and Other Exposed Parts
Terminals and other exposed parts of electrical units should have insulating covers secured before
operation.
5. Electrode Wire
Electrode wire becomes electrically HOT when the power switch of gas metal-arc welding equipment is ON
and welding gun trigger is pressed. Keep hands and body clear of wire and other HOT parts.
6. 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 red-tag switches) to prevent accidental turning ON of power. Disconnect all cables from welding power
source, and pull all 115 volts line-cord plugs.
Do not open power circuit or change polarity while welding. 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.