Grounding and Bonding Flashcards
7 cards from real NEC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Grounding and Bonding flashcards as text
What is the minimum size copper grounding electrode conductor required for a 200-ampere service with a single ground rod electrode per NEC Article 250?
Answer: 6 AWG copper
NEC 250.66 limits the grounding electrode conductor to a single rod, pipe, or plate electrode to 6 AWG copper regardless of service size.
According to NEC 250.53, when a single ground rod does not achieve 25 ohms or less to earth, what must be done?
Answer: Install one additional electrode
NEC 250.53(A)(2) requires one additional electrode when resistance of a single rod exceeds 25 ohms.
Which NEC article specifically covers grounding and bonding requirements?
Answer: Article 250
NEC Article 250 exclusively covers all grounding and bonding requirements for electrical systems.
What is the purpose of an equipment bonding jumper (EBJ) per NEC 250.102?
Answer: Connect metal parts to ensure electrical continuity
An EBJ connects metal enclosures, raceways, or equipment to ensure a low-impedance fault current path.
Per NEC 250.24(A), where must the grounding electrode conductor connection be made on a service entrance?
Answer: At the service entrance equipment
NEC 250.24(A) requires the grounding electrode conductor to be connected to the service entrance equipment.
What is the maximum spacing allowed between two ground rods when used as a grounding electrode system per NEC 250.53?
Answer: 6 feet
NEC 250.53(B) requires ground rods to be spaced no less than 6 feet apart from each other.
Under NEC 250.119, which color or marking is required for equipment grounding conductors (EGCs) larger than 6 AWG?
Answer: Green or green with yellow stripe, or identified at terminations
EGCs larger than 6 AWG may be any color but must be identified with green marking or green tape at terminations.