Services and Distribution Flashcards
6 cards from real Electrician practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Services and Distribution flashcards as text
What is the minimum ampacity required for a service to a single-family dwelling per the NEC?
Answer: 100 amps
NEC 230.79(C) requires a minimum 100-ampere service for single-family dwellings.
What is the purpose of a main disconnect in a service entrance panel?
Answer: To provide a means to disconnect all power to the premises
The main disconnect provides a single means to de-energize all branch circuits and feeders within the building.
What is the difference between a service lateral and a service drop?
Answer: A lateral is underground; a drop is overhead
A service lateral refers to underground service conductors, while a service drop refers to overhead conductors from the utility.
What is the maximum number of disconnecting means permitted at a service entrance per the NEC?
Answer: 6
NEC 230.71 allows a maximum of six disconnects at a single service entrance location.
What type of grounding electrode is considered the most effective?
Answer: Concrete-encased electrode (Ufer ground)
The concrete-encased electrode (Ufer ground) is considered highly effective because the moisture in concrete provides excellent soil contact.
What is the minimum length for a ground rod?
Answer: 8 feet
NEC 250.52(A)(5) requires a ground rod to be at least 8 feet long when driven into the earth.