Grounding Requirements; Electrical Safety - IBM TotalStorage DS4000 Hardware Maintenance Manual

v Insert the ends of your necktie or scarf inside clothing or fasten it with a
v Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your
v Wear safety glasses when you are doing any of the following: hammering,
v After service, reinstall all safety shields, guards, labels, and ground wires.
v Reinstall all covers correctly before returning the machine to the customer.

Grounding requirements

Electrical grounding of the computer is required for operator safety and correct
system function. Proper grounding of the electrical outlet can be verified by a
certified electrician.

Electrical safety

Important
Use only approved tools and test equipment. Some hand tools have handles that are 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.
Observe the following rules when working on electrical equipment.
v Find the room emergency power-off (EPO) switch, disconnecting switch, or
v Do not work alone under hazardous conditions or near equipment that has
v Disconnect all power before doing any of the following tasks:
v Before you start to work on the machine, unplug the power cord. If you cannot
v If you need to work on a machine that has exposed electrical circuits, observe the
nonconductive clip, approximately 8 centimeters (3 in.) from the end.
clothing. Remember: Metal objects are good electrical conductors.
drilling soldering, cutting wire, attaching springs, using solvents, or working in
any other conditions that might be hazardous to your eyes.
Replace any safety device that is worn or defective.
electrical outlet. If an electrical accident occurs, you can then operate the switch
or unplug the power cord quickly.
hazardous voltages.
– Performing a mechanical inspection
– Working near power supplies
– Removing or installing main units
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.
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.
– 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 previous rule, you might 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.
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Safety