Guidelines For Servicing Electrical Equipment - IBM System x3750 M4 Installation And Service Manual

2. Make sure that the exterior cover is not damaged, loose, or broken, and observe
3. Check the power cord:
4. Remove the top cover.
5. Check for any obvious non-IBM alterations. Use good judgment as to the safety
6. Check inside the server for any obvious unsafe conditions, such as metal
7. Check for worn, frayed, or pinched cables.
8. Make sure that the power-supply cover fasteners (screws or rivets) have not

Guidelines for servicing electrical equipment

This information provides the guidelines for servicing electrical equipment.
Observe the following guidelines when you service electrical equipment:
v Check the area for electrical hazards such as moist floors, nongrounded power
v Use only approved tools and test equipment. Some hand tools have handles that
v Regularly inspect and maintain your electrical hand tools for safe operational
v Do not touch the reflective surface of a dental mirror to a live electrical circuit.
v Some rubber floor mats contain small conductive fibers to decrease electrostatic
v Do not work alone under hazardous conditions or near equipment that has
v Locate the emergency power-off (EPO) switch, disconnecting switch, or electrical
v Disconnect all power before you perform a mechanical inspection, work near
v Before you work on the equipment, disconnect the power cord. If you cannot
v Never assume that power has been disconnected from a circuit. Check it to
v If you have to work on equipment that has exposed electrical circuits, observe
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System x3750 M4 Types 8722 and 8733: Installation and Service Guide
any sharp edges.
v Make sure that the third-wire ground connector is in good condition. Use a
meter to measure third-wire ground continuity for 0.1 ohm or less between
the external ground pin and the frame ground.
v Make sure that the power cord is the correct type, as specified in "Power
cords" on page 222.
v Make sure that the insulation is not frayed or worn.
of any non-IBM alterations.
filings, contamination, water or other liquid, or signs of fire or smoke damage.
been removed or tampered with.
extension cords, power surges, and missing safety grounds.
are covered with a soft material that does not provide insulation from live
electrical currents.
condition. Do not use worn or broken tools or testers.
The surface is conductive and can cause personal injury or equipment damage if
it touches a live electrical circuit.
discharge. Do not use this type of mat to protect yourself from electrical shock.
hazardous voltages.
outlet so that you can turn off the power quickly in the event of an electrical
accident.
power supplies, or remove or install main units.
disconnect the power cord, have the customer power-off the wall box that
supplies power to the equipment and lock the wall box in the off position.
make sure that it has been disconnected.
the following precautions:
– Make sure that another person who is familiar with the power-off controls is
near you and is available to turn off the power if necessary.