Electrical safety
Observe the following rules when working on electrical equipment.
Important:
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 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.
•Find the room emergency
•Do not work alone under hazardous conditions or near equipment that has 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
•If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
–Ensure that another person, familiar with the
–Use only one hand when working with
Attention: An electrical shock can occur only when there is a complete circuit. By observing the above rule, you may 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.
–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; Instructions for these precautions 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 and 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, nongrounded 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
–Similar units to listed above
This practice ensures correct grounding of the units.
• If an electrical accident occurs:
Chapter 1. Safety information 3
