Observe these guidelines when servicing electrical equipment.
- Check the area for electrical hazards such as moist floors, nongrounded
power extension cords, and missing safety grounds.
- Use only approved tools and test equipment. Some hand tools have handles
that are covered with a soft material that does not provide insulation from
live electrical current.
- Regularly inspect and maintain your electrical hand tools for safe operational
condition. Do not use worn or broken tools or testers.
- Do not touch the reflective surface of a dental mirror to a live electrical
circuit. The surface is conductive and can cause personal injury or equipment
damage if it touches a live electrical circuit.
- Some rubber floor mats contain small conductive fibers to decrease electrostatic
discharge. Do not use this type of mat to protect yourself from electrical
shock.
- Do not work alone under hazardous conditions or near equipment that has
hazardous voltages.
- Locate the emergency power-off (EPO) switch, disconnecting switch, or
electrical outlet so that you can turn off the power quickly in the event
of an electrical accident.
- Disconnect all power before you perform a mechanical inspection, work
near power supplies, or remove or install main units.
- Before you work on the equipment, disconnect the power cord. If you cannot
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.
- Never assume that power has been disconnected from a circuit. Check it
to make sure that it has been disconnected.
- If you have to work on equipment that has exposed electrical circuits,
observe 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.
- When you are working with powered-on electrical equipment, use only one
hand. Keep the other hand in your pocket or behind your back to avoid creating
a complete circuit that could cause an electrical shock.
- When using a tester, set the controls correctly and use the approved probe
leads and accessories for that tester.
- Stand on a suitable rubber mat to insulate you from grounds such as metal
floor strips and equipment frames.
- Use extreme care when measuring high voltages.
- To ensure proper grounding of components such as power supplies, pumps,
blowers, fans, and motor generators, do not service these components outside
of their normal operating locations.
- If an electrical accident occurs, use caution, turn off the power, and
send another person to get medical aid.