Electrical Safety

Observe the following rules when working on electrical equipment.

Important

Use only approved tools and test equipment. Some

hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents.

Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock.

ŸFind the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the

switch or unplug the power cord quickly.

ŸDo not work alone under hazardous conditions or

near equipment

 

that

has

hazardous voltages.

Ÿ Disconnect

all

power

before:

–

Performing

a

mechanical

inspection

–

Working

near

power

supplies

–

Removing

or

installing

main units

ŸBefore you start to work on the machine, unplug the

power

cord. If

you

cannot

unplug

it,

ask

the

customer

to power-off the wall box that supplies

power

to the

machine

and to

lock

the wall

box

in

the

off

position.

ŸIf you need to work on a machineexposedthat has

electrical circuits, observe the following precautions:

–Ensure that another person, familiar with the power-off controls, is near you.

Remember: Another person must be there to switch off the power, if necessary.

–Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back.

Remember: There must be a complete circuit to cause electrical shock. By observing the above rule, you may prevent a current from passing through your body.

–When using testers, set the controls correctly

 

and use the approved probe leads and

 

 

 

accessories

for

that tester.

 

 

 

 

–

Stand

on

suitable

rubber

mats

(obtained

locally,

 

if necessary)

to

insulate

you

from

grounds

such

 

as metal floor strips and machine frames.

 

 

Observe

the

special

safety

precautions

when

you

work

with

very

high

voltages;

these instructions

are in

the safety sections of maintenance information. Use

extreme

care

when

measuring

high

voltages.

 

 

Introduction15