Electrical · NEC 250

Grounding & bonding

Electrodes, EGCs, neutral-ground separation, water pipe and gas bonding. 6 drills, each with the answer, the fix and the 2023 NEC section.

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The drills

Basement water service entrance
Level 1 · Apprentice
Water service entrance in an unfinished basement
Garage subpanel, cover off
Level 2 · Journeyman
Attached-garage subpanel fed from the main panel in the basement, cover removed
Bedroom receptacle in an older home
Level 2 · Journeyman
Replacement receptacle in a 1920s bedroom, cover plate off
Detached garage panel
Level 2 · Journeyman
Detached garage panel fed underground from the house, cover removed
Meter and grounding electrode conductor
Level 3 · Master
Meter and grounding electrode conductor on the side of the house, January
Mechanical room receptacle box
Level 3 · Master
Receptacle box on a block wall in a commercial mechanical room, cover removed

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