Licensed Electrical Contractor Grounding and Bonding Questions and Answers Flashcards
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Read the first 6 Licensed Electrical Contractor Grounding and Bonding Questions and Answers flashcards as text
What type of grounding electrode is formed by at least 20 feet of steel reinforcing bars (rebar) tied together within a concrete foundation?
Answer: Concrete-encased electrode
A concrete-encased electrode (Ufer ground) uses rebar or bare copper embedded at least 20 feet in a building foundation.
Per NEC 250.64(E), when multiple service disconnects are located in separate enclosures, how may the grounding electrode conductor be run?
Answer: It may be tapped using listed connectors at each enclosure
NEC 250.64(E) permits tapping the grounding electrode conductor at each service disconnect using listed connectors.
What is the minimum burial depth required for a driven ground rod to be effective per NEC 250.53(G)?
Answer: 8 feet
NEC 250.53(G) requires driven rod electrodes to have at least 8 feet of contact with the soil.
Which of the following is an acceptable method for bonding around a water meter to maintain grounding continuity?
Answer: Installing a bonding jumper across the meter
A bonding jumper must be installed around the water meter to ensure continuous grounding because meters can be removed for service.
According to NEC 250.122, how is the minimum size of an equipment grounding conductor determined for a branch circuit?
Answer: By the rating of the overcurrent device protecting the circuit
NEC Table 250.122 sizes equipment grounding conductors based on the rating of the overcurrent device ahead of the circuit.
What is the purpose of the main bonding jumper at the service equipment?
Answer: To connect the neutral bus to the equipment grounding bus
The main bonding jumper connects the grounded (neutral) conductor to the equipment grounding conductor and service enclosure at the service.