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Make sure electrical equipment is effectively grounded.

You must:
• Make sure the path to ground from circuits, equipment, and enclosures is permanent, continuous, and effective.
• Make sure exposed noncurrent-carrying metal parts of cord- and plug-connected equipment that may become energized are grounded under any of the following conditions:
– If operated at over 150 volts to ground, except for guarded motors and metal frames of electrically heated appliances if the appliance frames are permanently and effectively insulated from ground.
– Equipment in hazardous locations. (WAC 296-24-95613)
− If the equipment is of the following types:
– Hand-held motor-operated tools.
– Stationary and fixed motor-operated tools.
– Light industrial motor-operated tools.
– Refrigerators.
– Freezers.
– Air conditioners.
– Clothes washers and dryers.
– Dishwashers.
– Electrical aquarium equipment.
– Sump pumps.
– Hedge clippers.
– Electric lawn mowers.
– Electric snow blowers.
– Wet scrubbers.
– Tools likely to be used in damp or wet locations.
– Appliances used by employees standing on the ground, on metal floors or working inside of metal tanks or boilers.
– Portable hand lamps.
– Portable and mobile X-ray and associated equipment.
– Tools likely to be used in wet and conductive locations.
Note:
Grounding can be achieved by using tools and appliances equipped with an equipment grounding conductor (three-prong plug and grounded electrical system).
 
You must:
• Make sure exposed metal parts of fixed equipment that do not conduct electricity, but may become energized, are grounded under any of the following conditions:
– If the equipment is in a wet or damp location and is not isolated.
– If within 8 feet vertically or 5 feet horizontally of ground or grounded metal objects and subject to employee contact.
– If in electrical contact with metal.
– If in a hazardous (classified) location.
– If supplied by a metal-clad, metal-sheathed, or grounded metal raceway wiring method.
– If equipment operates with any terminal at over 150 volts to ground.
• Make sure a conductor used as a grounded conductor is identifiable and distinguishable from all other conductors.
• Make sure a conductor used as an equipment grounding conductor is identifiable and distinguishable from all other conductors.
• Make sure grounded conductors are not attached to any terminal or lead so as to reverse polarity of the electrical outlet or receptacle. See illustration - Examples of wiring.
• Make sure grounding terminals or grounding-type devices on receptacles, cords, connectors, or attachments plugs are not used for purposes other than grounding.
EXAMPLES OF WIRING
 
CORRECT WIRING
 
INCORRECT WIRING
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060, and chapter 49.17 RCW. WSR 12-16-064, § 296-800-28040, filed 7/31/12, effective 9/1/12. Statutory Authority: RCW 49.17.010, [49.17].040, and [49.17].050. WSR 02-16-047, § 296-800-28040, filed 8/1/02, effective 10/1/02; WSR 01-23-060, § 296-800-28040, filed 11/20/01, effective 12/1/01; WSR 01-11-038, § 296-800-28040, filed 5/9/01, effective 9/1/01.]
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