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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.
Find 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.
Do not work alone under hazardous conditions or
near equipment that has hazardous voltages.
Disconnect all power before:
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Before 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.
If you need to work on a machine that has exposed
electrical circuits, observe the following precautions:
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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.
© Copyright IBM Corp. 1998
Performing a mechanical inspection
Working near power supplies
Removing or installing main units
Ensure that another person, familiar with the
power-off controls, is near you.
Attention: 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.
Attention: 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.
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