Journeyman Electrician's Grounding and Bonding Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's Grounding and Bonding flashcards as text
When two ground rods are used as a supplemental electrode system, what is the minimum spacing between them per NEC 250.53(B)?
Answer: 6 feet
Per NEC 250.53(B), rod and pipe electrodes must be spaced at least 6 feet apart to avoid overlapping effective ground areas.
A concrete-encased grounding electrode (Ufer ground) must have at least how many feet of bare or zinc-coated steel reinforcing bars?
Answer: 20 feet
Per NEC 250.52(A)(3), the concrete-encased electrode requires at least 20 feet of one or more bare steel reinforcing bars in direct contact with earth.
Which of the following is the correct term for the low-impedance path intended to carry fault current back to the source?
Answer: Effective ground-fault current path
The effective ground-fault current path is the intentional, low-impedance path that carries fault current from the fault point back to the electrical supply source.
At a subpanel in a detached garage fed by a feeder from the house, which conductors must be run to the subpanel?
Answer: Hot, neutral, and a separate equipment grounding conductor
A feeder to a separate structure must include a separate equipment grounding conductor; the neutral and ground must not be bonded at the subpanel.
What is the minimum size conductor required for a ground ring surrounding a building per NEC 250.52(A)(4)?
Answer: 2 AWG bare copper
Per NEC 250.52(A)(4), a ground ring must consist of at least 2 AWG bare copper conductor encircling the building.
When using aluminum as a grounding electrode conductor, what special installation precaution must be taken near the ground or in contact with masonry?
Answer: It cannot be used within 18 inches of the earth or in contact with masonry
Per NEC 250.64(A), aluminum or copper-clad aluminum GECs cannot be used within 18 inches of the earth or in contact with masonry.
The supply-side bonding jumper in a separately derived system serves the same function as which component at the service entrance?
Answer: Main bonding jumper
The supply-side bonding jumper at a separately derived system performs the same bonding function as the main bonding jumper does at the service entrance.