Electrical current from power, telephone, and communication cables can be hazardous. To avoid any shock hazard, you must disconnect all power cords and cables.
Observe the following rules when working on electrical equipment.
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:
Doing a mechanical inspection
Working near power supplies
Removing or installing servers
Before you start to work on the server, unplug the power cord. If you cannot unplug it, ask the customer to switch off the wall box that supplies power to the server. Afterwards, lock the wall box in the off position.
If you must work on a server that has exposed electrical circuits, observe the following precautions:
Ensure that another person, familiar with the power-off controls, is near you. Another person must be there to switch off the power if necessary.
Stand on suitable rubber mats to insulate you from grounds such as metal floor strips and system unit frames. Obtain the mats locally, if necessary.
When using testers, set the controls correctly and use the approved probe leads and accessories for the tester.
Use only one hand when working with powered-on electrical equipment. Keep the other hand in your pocket or behind your back. This precaution can prevent current from passing through your body.
Regularly inspect and maintain your electrical hand tools for safe operational condition. Do not use worn or broken tools and testers.
Never assume that power was disconnected from a circuit. First, verify that the unit is turned off.
Always look carefully for possible hazards in your work area. Examples of hazards are moist floors, non-grounded power extension cables, and missing safety grounds.
Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is conductive. Touching a live circuit can cause personal injury and damage to the server.
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 place rubber floor mats that contain small conductive fibers to decrease electrostatic discharges near the equipment. Do not use this type of mat to protect yourself from electrical shock.
If an electrical accident occurs:
