If you measure 20 feet between an existing box and a new box location, you should cut a piece
1. If you measure 20 feet between an existing box and
a new box location, you should cut a piece of cable with a length of approximately
A. 20 to 21 ft.
B. 25 to 26 ft.
C. 40 to 42 ft.
D. 48 to 55 ft.
2. When a device is removed from an outlet box,
the _______ wire must be connected in such a way that maintains continuity.
D. grounded neutral
3. To correctly saw a lath and plaster wall, point
the teeth of the saw
A. away from you and cut on the pushing stroke.
B. away from you and cut on the pulling stroke.
C. toward you and cut on the pushing stroke.
D. toward you and cut on the pulling stroke.
4. The labor performed when you extend an existing
electrical system is called
A. old work.
B. repair work.
5. The basement in an existing building has
concrete walls, a concrete floor, and a concrete ceiling. From this
information, you know that receptacles, lamp fixtures, and switches
A. can’t be installed in this basement as there is
no way to ground the circuit.
B. won’t require ground-circuit protection because
concrete insulates the occupants from ground.
C. can be installed in the basement and circuit
wiring enclosed in a surface raceway system.
D. can only be installed if they’re connected with
6. Which of the following tests must be performed
on a de-energized circuit?
A. Power test
B. Continuity test
C. Voltage test
D. Current test
7. Each outside receptacle must be protected by
A. a GFCI.
B. its own ground rod.
C. a single- or double-pole switch.
D. its own circuit.
8. A circuit consists of five unequal loads
connected in parallel. To measure the resistance through one specific load, you
A. remove power from the circuit and measure the
load’s resistance in its installed location.
B. apply power to the circuit, disconnect the load
from the circuit, and measure the load’s resistance.
C. apply power to the circuit, measure the overall
circuit resistance, and divide this value by five.
D. remove power from the circuit, disconnect the
load from the circuit, and measure the load’s resistance.
9. When new work is being performed, an outlet box
must have a minimum depth of
A. 1 in.
B. 11/2 in.
C. 2 in.
D. 21/2 in.
10. When new outlets are being added to the first
floor of a two-story house with an unfinished basement, the easiest route for
running cable is usually
A. behind the wall.
B. behind the baseboard.
C. by way of the second floor.
D. by way of the basement.
11. When an aluminum conductor is installed on a
screw terminal, the screw should be tightened to a torque of
A. 8 lb-in.
B. 12 lb-in.
C. 15 lb-in.
D. 20 lb-in.
12. A fixed electric space heater that draws a
maximum current of _______ must be supplied by a cable with an ampacity of
A. 15 A
B. 24 A
C. 27 A
D. 30 A
13. If a fixed appliance has an automatically
started motor and is supplied by an individual branch circuit, the protection
recommended is equal to or less than
A. twice the appliance rated current.
B. 125 percent of the appliance rated current.
C. the appliance rated current.
D. the full service current.
14. Which of the following is a true statement
about the planning stages of adding a receptacle to an existing electrical
A. You must ensure that the existing circuit
breaker will have enough capacity to handle the expected load to be applied at
the new receptacle.
B. It’s not acceptable to bring power from an
existing box containing a light switch.
C. Only nongrounding-type receptacles can be added
to an existing system.
D. It isn’t necessary to identify joist or stud
locations prior to adding a new receptacle.
15. When installing cable behind a wall, it’s
recommended to run the cable behind the baseboard rather than through the studs
A. fish tape can’t be utilized.
B. wall is plasterboard.
C. wall studs are less than 16 inches apart.
D. wall is plaster or lath.
16. A device box with supports is the best choice
when installing a
A. device box mounted in an existing
B. device box in a lath ceiling.
C. device box that’s to be attached to a bar
D. shallow device box in either new or existing
17. A transformer that’s used with a doorbell has
a fixed output of
A. 1 V.
B. 10 V.
C. 60 V.
D. 120 V.
18. A suitable disconnecting means for a fixed
appliance is a
A. pigtail cord.
B. light switch that interrupts the hot wire.
C. circuit breaker.
D. two-pole switch that interrupts the common wire.
19. The most efficient way to troubleshoot a
defective electrical circuit is to start by
A. replacing the components that you believe are
B. having the power company evaluate the entire
system’s operating efficiency.
C. breaking down a multiple-circuit system into
isolated circuits to be evaluated one at a time.
D. bypassing the system’s main disconnect to
ensure continuous power.
20. After routing cable from an existing device box
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