(3) Precautions.
(a) Cables will always be connected or disconnected by grasping
end connectors and not be pulling the cable leads.
(b) When troubleshooting or calibrating electrical/electronic
equipment, the specialist will not place one hand on an energized component
and the other on an electrical ground, such as the chassis of the equipment.
A suggested method of working on such equipment is to use only one hand for
probing while keeping the other hand in the pocket or behind the back. When
performing operations requiring the use of both hands (e.g., when making
held and placed firmly on test points.
Where high voltage is present,
deenergize equipment and connect all required leads to test points with
wooden sticks or insulated clips; then reenergize to make the measurement.
(c) The following additional precautions are to be observed when
troubleshooting, repairing, or calibrating electrical/electronic equipment.
1. Remove
your
bracelets,
watches,
rings,
or
other
metal
objects.
2. Insure that rescue equipment, such as ropes and hot sticks,
is available in the immediate area.
3. Two persons must be in the immediate work area at all times
while work is being performed on circuits carrying over 30 volts rms or DC
to assure that one person is available to render assistance in case of
accident.
(4) Do not handle energized electrical equipment when hands, feet, or
body are wet or perspiring or when standing on a wet floor.
(5) When it is necessary to touch electrical equipment (for example,
when checking for overheated motors), use the back of the hand; therefore,
if accidental shock were to cause muscular contraction, your hand would pull
away rather than uncontrollably grab the equipment.
(6) Where dangerous voltages exist, flooring and work surfaces will
be of nonconductive material (e.g., sheet vinyl, asphalt tile, rubber mats,
wooden platforms, etc).
The minimum allowable resistance under maximum
working voltage for a given area will be not less than 1 megohm per kilovolt
when tested in accordance with procedures of (a) and (b) below.
(a) Initial tests (figure 3) shall be made of all nonconductive
floorings and work surfaces for the minimum allowable resistance as
specified above.
Subsequent tests shall be made at least annually.
Coordination with the facility engineer may be required during testing.
Records identifying
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