Electrical Safety - IBM xSeries 240 81Y Hardware Maintenance Manual

Reinstall all covers correctly before returning the
machine to the customer.

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
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 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:
– Performing a mechanical inspection
– Working near power supplies
– Removing or installing main units
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:
– 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.
250
xSeries 240 HMM