Building Engineering Electrical Systems in Buildings

Question 1

What is the standard voltage for single-phase residential electrical service in the United States?

Accepted Answer

120/240V

Answer

208/120V

Answer

480/277V

Answer

600/347V

Question 2

Which wire color indicates a grounded neutral conductor in US electrical wiring?

Accepted Answer

White

Answer

Green

Answer

Black

Answer

Red

Question 3

What device automatically disconnects a circuit when current exceeds its rated ampacity?

Accepted Answer

Circuit breaker

Answer

GFCI outlet

Answer

Surge protector

Answer

Disconnect switch

Question 4

What does GFCI stand for in building electrical systems?

Accepted Answer

Ground Fault Circuit Interrupter

Answer

Ground Fault Current Indicator

Answer

General Fault Circuit Isolator

Answer

Ground Frequency Circuit Inverter

Question 5

What is the minimum clearance required between electrical panelboards and the floor per the NEC?

Accepted Answer

6 feet 6 inches

Answer

3 feet

Answer

4 feet

Answer

5 feet

Question 6

Which conduit type is commonly used for exposed outdoor electrical runs in commercial buildings?

Accepted Answer

Rigid Metal Conduit (RMC)

Answer

NM-B cable

Answer

FMC

Answer

UF cable