Exposed non-current-carrying metal parts of cord- and plug-connected
equipment which may become energized shall be grounded:
- If in a hazardous (classified) location
- If operated at over 150 volts to ground, except for guarded motors and metal frames of
electrically heated appliances when the appliance frames are permanently and effectively
insulated from ground
- If the equipment is of the following types:
- Refrigerators, freezers, and air conditioners
- Clothes-washing, clothes-drying, dishwashing machines, sump
pumps, and electrical aquarium equipment
- Hand-held motor-operated tools
- Motor-operated appliances of the following types: hedge
clippers, lawn mowers, snow blowers, and wet scrubbers
- Cord- and plug-connected appliances used in damp or wet
locations or by employees standing on the ground or on metal floors or working inside of
metal tanks or boilers
- Portable and mobile X-ray and associated equipment
- Tools likely to be used in wet and conductive locations
- Portable hand lamps.
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