Article 250-Grounding and Bonding(Equipment Connected by Cord and Plug)

Published on 20 November 2024 at 20:21

 

250.114 Equipment Connected by Cord and Plug

 

Exposed, normally non-current-carrying metal parts of cord-and-plug-connected equipment shall be connected to the equipment grounding conductor under any of the following conditions:

Exception: Listed tools, listed appliances, and listed equipment covered in 250.114, list items 2 through 4, shall not be required to be connected to an equipment grounding conductor if protected by a system of double insulation or its equivalent. Double-insulated equipment shall be distinctively marked.
  1. In hazardous (classified) locations
  2. If operated at over 150 volts to ground
    Exception No. 1 to (2): Motors, if guarded, shall not be required to be connected to an equipment grounding conductor.
    Exception No. 2 to (2): Metal frames of electrically healed appliances, exempted by special permission, shall not be required to be connected to an equipment grounding conductor, in which case the frames shall be permanently and effectively insulated from ground.
  3. In residential occupancies:
    1. Refrigerators, freezers, icemakers, and air conditioners
    2. Clothes-washing, clothes-drying, and dish-washing machines; ranges; kitchen waste disposers; information technology equipment; sump pumps; and electrical aquarium equipment
    3. Hand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated tools
    4. Motor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbers
    5. Portable handlamps
  4. In other than residential occupancies:
    1. Refrigerators, freezers, icemakers, and air conditioners
    2. Clothes-washing, clothes-drying, and dish-washing machines; information technology equipment; sump pumps; and electrical aquarium equipment
    3. Hand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated tools
    4. Motor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbers
    5. Portable handlamps
    6. Cord-and-plug-connected appliances used in damp or wet locations or by persons standing on the ground, standing on metal floors, or working inside of metal tanks or boilers
    7. Tools likely to be used in wet or conductive locations

 

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