Electrical Systems & Wiring Installation Flashcards

What is the purpose of a bonding jumper in an electrical system?

Answer: To connect grounding conductors to ensure electrical continuity

A bonding jumper ensures electrical continuity between metal parts, providing a path for fault current.

Under NEC, what is the minimum burial depth for Schedule 80 PVC conduit under a residential driveway?

Answer: 12 inches

Schedule 80 PVC under a residential driveway requires a minimum burial depth of 12 inches per NEC Table 300.5.

An arc fault circuit interrupter (AFCI) breaker is designed primarily to protect against:

Answer: Electrical arcs that can ignite fires

AFCI breakers detect dangerous arcing conditions in wiring that can cause electrical fires.

What is the correct torque specification practice when terminating conductors at breaker lugs?

Answer: Follow the manufacturer's listed torque value in inch-pounds

NEC 110.14(D) requires terminals to be tightened to the torque values listed by the manufacturer.

In a 3-way switch circuit, what type of wire is used to connect the two 3-way switches?

Answer: 14/3 NM-B cable

14/3 NM-B provides the two traveler wires plus neutral needed to wire a 3-way switch circuit.

What is the maximum volt-drop percentage recommended by NEC for branch circuits serving lighting and receptacle loads?

Answer: 3%

NEC recommends limiting voltage drop to 3% on branch circuits to maintain proper equipment performance.

Which wiring method is required when installing exposed wiring on the exterior of a building subject to physical damage?

Answer: RMC or IMC conduit

RMC or IMC provides the physical protection required for exposed exterior wiring subject to damage.