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Latest Updated 2026
What is the minimum depth of grounding rods?
8 feet
What is the maximum resistance for a grounding rod/pipe?
25 ohms
short circuit
conducting connection, whether intentional, between any of the conductors of an electrical
system, whether it is from line to line or from line to neutral
, Ground fault
unintentional electrically conducting connection between an ungrounded conductor of an
electrical circuit and the normally noncurrent-carrying conductors, metallic equipment, or the
earth
What relates to service entrance equipment?
System grounding and bonding
When is grounding required?
Where supplied by transformers if the supply voltage to the transformer exceeds 150V to
ground
When should AC systems over 1kV be grounded?
if they supply mobile or portable equipment
Why should a grounded system limit the voltage on the electrical system?
to protect it from voltage surges higher than that for which the circuit is designed
What NEC section has requirements for grounding of services?
NEC 250.24 A, B, C & D