A+ Answers

  1. The NEC requires that each service disconnecting means be suitable for

A. hazardous locations.

B. the prevailing conditions.

C. wet conditions.

D. disconnecting the meter.

  1. The NEC states that service-drop conductors with voltage limited to 300 volts to ground shall have a minimum of _______ feet vertical clearance from final grade over residential property, driveways, and those commercial areas not subject to truck traffic.

A. 18

B. 15

C. 20

D. 12

  1. Which of the following is not an acceptable insulation type for an operating temperature of 167°F?

A. THW

B. THHW

C. THWN

D. TW

  1. A one-family dwelling contains an electric range rated at 25 kW. What is the neutral load demand for this range?

A. 9240 VA

B. 9800 VA

C. 10,465 VA

D. 13,200 VA

  1. What is the correct conductor size for a copper Type THW conductor used in a 120/240 V, 3-wire, single-phase dwelling service or feeder rated at 200 amperes?

A. 2

B. 1/0

C. 2/0

D. 3/0

  1. The calculating load requirements for a single-family dwelling, which of the following would not be considered in the fixed-appliance calculation?

A. Dishwasher

B. Food disposer

C. Dryer

D. Water heater

  1. The NEC requires that a fuse or an overcurrent trip unit of a circuit breaker be connected in series with each ungrounded

A. device.

B. conductor.

C. panel.

D. neutral.

  1. Calculate the general lighting load for a one-family dwelling with a total living area measuring 25′ × 70′. A. 583 VA

B. 3500 VA

C. 5400 VA

D. 5250 VA

  1. What is the general lighting and receptacle load for a dwelling of 2,500 square feet, having four small appliance branch circuits and one laundry branch circuit?

A. 5250 VA

B. 7575 VA

C. 15,000 VA

D. 7200 VA

  1. Two electricians are discussing OCPDs. Electrician A says that clothes closets are ideal locations for panelboards with circuit breakers because it hides them from view of nonoccupants. Electrician B says bathrooms are a preferred location for the panelboard so that they conform to ready access requirements. Which of the following statements is correct?

A. Only Electrician A is correct.

B. Neither electrician is correct.

C. Only Electrician B is correct.

D. Both electricians are correct.

  1. Two electricians are discussing voltage rating of circuit breakers. Electrician A says that a circuit breaker marked 120/240V is acceptable for a circuit that doesn’t exceed 220 V between any two conductors. Electrician B says that a circuit breaker marked only 240 V wouldn’t be acceptable in the same application. Which of the following statements is correct?

A. Neither electrician is correct.

B. Both electricians are correct.

C. Only Electrician B is correct.

D. Only Electrician A is correct.

  1. If a circuit contains portions of different ampacities, the higher ampacity is permitted to be used for the entire circuit if the lower-ampacity conductor runs for the lesser of 10-feet in length or _______ percent of the circuit length.

A. 15

B. 49

C. 10

D. 20

  1. The minimum size service disconnect for a single-family dwelling is

A. 150 A.

B. 60 A.

C. 100 A.

D. 200 A.

  1. A one-family dwelling contains the following 120 V appliances, fastened in place, supplied by the same feeder: food disposer—750 VA; dishwasher—1450 VA; trash compactor—900 VA; two attic fans—750 VA each; water heater—8000 VA. What is the fixed-appliance line load for this dwelling?

A. 7088 VA

B. 12,600 VA

C. 9450 VA

D. 8888 VA

  1. Two electricians are discussing Edison-Base fuses. Electrician A says that he plans to install them in a new building where no circuit is over 125 volts or 30 amperes. Electrician B says that when replacing an existing installation, you must check for tampering. Which of the following statements is correct?

A. Only Electrician A is correct.

B. Neither electrician is correct.

C. Both electricians are correct.

D. Only Electrician B is correct.

  1. A 3,000 square-foot, one-family dwelling contains the following: three, small-appliance 20 A branch circuits and one laundry 20 A circuit, a 7 kW electric range, a 5 kW water heater, a 3 kW dryer, and a 1000 VA blower motor. What is the total general load in VA using the optional calculation method?

A. 18,400 VA

B. 17,800 VA

C. 17,400 VA

D. 12,400 VA

  1. According to the NEC, _______ AWG is the minimum size for copper conductors in normal overhead and underground service.

A. 6

B. 10

C. 8

D. 12

  1. For installations consisting of not more than one 2-wire branch circuit, the NEC requires that the service disconnecting means shall have a rating of not less than _______ amperes.

A. 15

B. 25

C. 20

D. 30

  1. Two electricians are discussing circuit breakers used as switches. Electrician A says that circuit breakers used as switches in a 120 V circuit need to be marked SWD or HID. Electrician B says the HID marking is required for high-intensity lighting. Which of the following statements is correct?

A. Neither electrician is correct.

B. Only Electrician A is correct.

C. Both electricians are correct.

D. Only Electrician B is correct.

  1. Which of the following is not considered service equipment?

A. Meter socket enclosures

B. Disconnecting means

C. Circuit breakers

D. Panelboards