Service entrance, grounding electrode systems, bonding and GFCI and AFCI protection.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the service entrance?
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The point where the electrical utility supply connects to the building's main distribution panel and service disconnect.- What is the maximum number of service disconnects permitted at one location?
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Six disconnects, unless they are arranged as a single group.- Where must the service disconnect be located?
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At a readily accessible point, either outside the building or inside nearest to the point of entry.- What is a grounding electrode?
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A conductor in direct contact with the earth used to establish a ground reference point.- What is a grounding electrode system?
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Two or more grounding electrodes bonded together to form a single ground point for the building.- What is the minimum diameter of a copper grounding rod?
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5/8 inch diameter for solid copper.- How deep must a driven rod electrode be installed?
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At least 8 feet deep, with at least 8 feet in contact with soil.- What is the acceptable resistance for a single grounding electrode?
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25 ohms or less; if that is not achieved, a second electrode must be installed.- What is a ground ring electrode?
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A bare copper conductor buried in a trench at least 2.5 feet deep, encircling the building perimeter.- What are the minimum dimensions for a concrete-encased electrode?
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At least 20 feet of bare copper conductor, 1/2 inch diameter minimum, encased in a concrete footing.- Can a water pipe serve as a grounding electrode?
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Yes, if it is at least 10 feet of buried metal pipe and in direct contact with soil.- What is the minimum size for a plate grounding electrode?
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1/4 inch thick, with at least 2 square feet of contact surface with soil.- What is bonding in electrical systems?
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The permanent joining of metal parts to form a continuous electrical path.- What is the main bonding jumper?
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A conductor that bonds the service neutral to the grounding electrode system at the service entrance.- What is an equipment grounding conductor?
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A conductor providing a path to ground for metal enclosures, equipment frames, and fault current.
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