Electrical Systems in Buildings Flashcards
6 cards from real Building Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical Systems in Buildings flashcards as text
What is the standard voltage for single-phase residential electrical service in the United States?
Answer: 120/240V
US residential single-phase service delivers 120V for small appliances and 240V for large loads like dryers and ranges.
Which wire color indicates a grounded neutral conductor in US electrical wiring?
Answer: White
Per NEC, white or gray insulation identifies the grounded neutral conductor in US branch circuits.
What device automatically disconnects a circuit when current exceeds its rated ampacity?
Answer: Circuit breaker
A circuit breaker trips on overcurrent to protect wiring and equipment from heat damage.
What does GFCI stand for in building electrical systems?
Answer: Ground Fault Circuit Interrupter
A Ground Fault Circuit Interrupter detects small current leakages to ground and shuts off power within milliseconds to prevent electrocution.
What is the minimum clearance required between electrical panelboards and the floor per the NEC?
Answer: 6 feet 6 inches
NEC requires a minimum headroom of 6 feet 6 inches in front of electrical equipment for safe working space.
Which conduit type is commonly used for exposed outdoor electrical runs in commercial buildings?
Answer: Rigid Metal Conduit (RMC)
Rigid Metal Conduit provides maximum physical protection and is suitable for wet, outdoor, and exposed locations.