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Electrical safety
CAUTION:
Electrical current from power, telephone, and communication cables can be hazardous. To avoid
personal injury or equipment damage, disconnect the attached power cords, telecommunication
systems, networks, and modems before you open the server/workstation covers, unless instructed
otherwise in the installation and configuration procedures.
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 y
ou 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.
w!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.
w!Do not work alone under hazardous conditions or near equipment that has hazardous voltages.
w!Disconnect all power before:
– Performing a mechanical inspection
– Working near power supplies
– Removing or insta
lling main units
w!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.
w!If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the power-off controls, is near you. Re member: 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 e
lectrica
l 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.
w!Regularly inspect and maintain your electrical hand tools for safe operational
condition.
w!
Do not use worn or broken tools and testers.
w!Never assume that power has been disconnected from a circuit. First, check that it has been powered-off.
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