IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Electrical SAFETY

•  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 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 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:
  1.  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. CAUTION:  Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical  currents.

     Use only approved tools and testers.

  2.  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 electrical shock. By observing the above rule, you may  prevent a current passing your body.

  3.  When using testers, set the controls correctly and use the approved probe leads and accessories for that tester.

     CAUTION:

      Many customers have, near their equipment, rubber floors mats that contain small conductive fibers to decrease electrostatic  discharges. Do not use this type of mat to protect yourself from electrical shock.

  4.  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.

•  Regularly inspect and maintain your electrical hand tools for safe operational condition.
•  Do not use worn or broken tools or testers.
•  Never assume that power has been disconnected from a circuit. First check that it has been powered-off.
•  Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, non grounded  power extension cables, power surges and missing safety grounds.
•  Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is conductive,  such touching can cause personal injury and machine damage.
•  Do not service the following parts with the power on when they are removed from their normal operating places in a machine:

•   - Power supply units
•   - Pumps
•   - Blowers and fans
•   - Motor generators

   and similar units. (This practice ensures correct grounding of the units.)

•  If an electrical accident occurs:

Please read > General SAFETY

See Part-Two (fullscreen)