Electrical Systems & Wiring Flashcards

What is the standard color code for the neutral wire in US residential wiring?

Answer: White

In US residential wiring, the neutral wire is white, the hot wire is black (or red), and the ground wire is green or bare copper.

A GFCI outlet is required by the NEC in which of the following locations?

Answer: Bathrooms

NEC requires GFCI protection in wet or damp locations including bathrooms, kitchens near sinks, garages, and outdoor areas.

Which wire gauge is typically used for a 20-amp branch circuit in US residential wiring?

Answer: 12 AWG

12 AWG copper wire is rated for 20 amps, while 14 AWG is used for 15-amp circuits.

What does 'overcurrent protection' prevent in an electrical circuit?

Answer: Excessive current that could cause overheating and fire

Overcurrent protection devices (fuses and breakers) interrupt the circuit when current exceeds safe levels, preventing overheating and fire.

In a series circuit, if one component fails (open circuit), what happens to the other components?

Answer: All components stop working

In a series circuit, current has only one path; an open in any component breaks the entire loop, stopping current flow everywhere.

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

Answer: To electrically connect metal parts so they share the same potential

Bonding connects conductive metal parts together so they remain at the same voltage potential, reducing shock hazard if a fault occurs.

Which type of conduit is non-metallic and often used in wet or corrosive environments?

Answer: PVC (Schedule 40)

PVC conduit is non-metallic, corrosion-resistant, and approved for wet locations, underground runs, and corrosive environments.