Clarke 250TE Dokumentacja Pobierz pdf (Strona 6)

(III) Connectors

Fully insulated lock-type connectors should be used to join welding cable lengths.

(IV) 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.

(V) Terminals and other exposed parts

Terminals and other exposed parts of electrical units should have insulating covers

secured before operation.

(VI) 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 HOT 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 processes may not be equipped

with welding power output on/off control devices. With such equipment the

electrode is electrically HOT when the power switch is turned ON. Never touch

the electrode unless the welding power source is off.

(VII) 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. 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. Always shut OFF and disconnect all power to

equipment. Power disconnect switch must be available near the welding power

source.

3-C Fire and Explosion Prevention

Comply with precautions in 2-C. Equipment’s rated capacity. Do not overload arc

welding equipment. It may overheat cables and cause a fire. Loose cable connections

may overheat or flash and cause a fire. Never strike an arc on a cylinder or other

pressure vessel. It creates a brittle area that can cause a violent rupture or lead to

such a rupture later under rough handling.

3-D Shock Prevention

Exposed hot conductors or other bare metal in the welding circuit, or in ungrounded,

electrically-HOT 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.

3-E Protection for Wearers of Electronic Life Support Devices

(Pacemakers).

Magnetic fields from high currents can affect pacemaker operation. Persons wearing

electronic life support equipment (pacemaker) should consult with their doctor before

going near arc welding, gouging, or spot welding operations.

3-F 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 can not 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.

(I) Grounding the equipment

When arc welding equipment is grounded according to the National Electrical

Code, and the work is grounded, 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 ground. Conductors must be adequate 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 a

flammable liquid such as oil or fuel.

(II) Electrode holders

Fully insulated electrode holders should be used. Do NOT use holders with

protruding screws or with any form of damage.

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