Deck 20: Checking Out and Troubleshooting Electrical Wiring Systems

Question 1

In a sub-panel, a green bonding screw provided by the panel manufacturer must be installed to electrically bond the grounded feeder conductor and the equipment-grounding conductors to the panel enclosure.

Answer 1

False
Only required in main panels.

Question 2

When holes are bored through wood framing members, they must be at least __________ inches from the nearest edge of the wood member.

A) 1
B) 1-1/8
C) 1-1/4
D) 1-1/2

Answer 2

C

Question 3

Residential electrical systems may be grounded using only the metal water pipe system and do not need a supplemental grounding electrode.

Answer 3

False

Question 4

Which of the following is not a NEC requirement for minimum clearance of a lighting fixture from the storage space in clothes closets?

A) 12" for surface incandescent or LED fixtures
B) 6" for recessed incandescent or LED fixtures
C) 12" for surface fluorescent fixtures
D) 6" for recessed fluorescent fixtures

Question 5

Receptacle outlets in habitable rooms must be installed so that no point measured horizontally along the floor line in any wall space in more than __________ feet from a receptacle outlet.

A) 2
B) 6
C) 10
D) 12

Question 6

A(n) __________ is an unintended low-resistance path through which current flows around, rather than along, a circuit's intended current path.

A) grounded circuit
B) open circuit
C) short circuit
D) grounding circuit

Question 7

GFCI protection is not required for 125 volt, 15- or 20-ampere receptacles located __________.

A) in bathrooms
B) in finished basements
C) in garages
D) outdoors

Question 8

The rating of the __________ determines the rating of a branch or feeder circuit.

A) fuse or circuit breaker
B) conductor
C) receptacle
D) main panel

Question 9

A continuity tester can be used to find short circuits, ground faults, and open circuits in de-energized circuits.

Question 10

The minimum length of free conductor at all boxes must be at least __________ inches.

A) 3
B) 6
C) 8
D) 12

Question 11

Outdoor receptacles must be installed __________.

A) only at the front of the dwelling
B) every 12 feet along the wall line
C) no more than 6.5 feet above grade
D) on each side of the dwelling

Question 12

According to the NEC, all work spaces must be provided with illumination.

Question 13

At kitchen countertops, receptacle outlets must be installed so that no point along the wall line is more than __________ feet, measured horizontally, from a receptacle outlet in that space.

A) 2
B) 6
C) 10
D) 12

Question 14

When there is a short in a branch circuit, a high circuit resistance develops that results in low amounts of current flowing on the circuit.

Question 15

The minimum size of service disconnect for a single-family dwelling unit permitted by the NEC is __________ amperes.

A) 60
B) 75
C) 100
D) 150

Question 16

In residential applications, Type NM cable is permitted to pass through environmental air handling spaces perpendicular to the long dimension of the space.

Question 17

According to the NEC, lighting fixtures must be installed in clothes closets.

Question 18

All branch circuits supplying 125-volt, 15- and 20-ampere outlets and devices in residential kitchens, family rooms, living rooms, dining rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms must be protected by a(n) __________

A) fuse
B) circuit breaker
C) GFCI device
D) AFCI device

Question 19

A(n) __________ is a circuit that is energized but does not allow useful current to flow on the circuit because of a break in the current path.

A) grounded circuit
B) short circuit
C) ground fault
D) open circuit

Question 20

At least __________ 20-ampere small appliance branch circuits are (is) required to serve kitchen countertop surfaces.

A) 1
B) 2
C) 3
D) No minimum number of circuits required

Question 21

When the white grounded circuit conductor is connected to the silver screw on a receptacle and the "hot" ungrounded conductor is connected to the brass screw on the receptacle, you have proper receptacle __________.

A) troubleshooting
B) grounding
C) polarity
D) timing

Question 22

When testing a "live" 120-volt receptacle using a voltage tester, you should get a 120-volt reading when measuring from the ungrounded conductor connection (short slot) to the grounding conductor connection (U-shaped slot).

Question 23

When testing a "live" 50-ampere, 125/250-volt range receptacle using a voltage tester, you should get a 240-volt reading when measuring from the grounded conductor connection (W slot) to either ungrounded conductor connection (X or Y slot).

Question 24

A(n) _________________________ is an unintended low-resistance path in an electrical circuit through which some current flows to ground using a pathway other than the intended pathway.

Question 25

The house electrical system may be grounded using a metal water pipe in direct contact with the earth for at least __________ feet.

A) 5
B) 10
C) 12
D) 20

Question 26

An electrician is testing a 15-ampere, 125-volt rated duplex receptacle with a voltage tester.The tester indicates 120 volts between the ungrounded slot and the grounded slot.The tester also indicates 120 volts between the grounded slot and the grounding slot.The likely cause is __________.

A) an open equipment grounding path
B) a short circuit in the cable feeding the receptacle
C) an open grounded circuit conductor
D) reversed polarity at the receptacle

Question 27

An electrician is testing a 20-ampere, 125-volt duplex receptacle with a voltage tester.The tester indicates 120 volts between the ungrounded slot and the grounded slot.The tester also indicates 0 volts between the ungrounded slot and the grounding slot.The likely cause is __________.

A) an open equipment-grounding path
B) reversed polarity at the receptacle
C) an open grounded circuit conductor
D) a short circuit in the cable feeding the receptacle

Question 28

Regular fluorescent ballasts are designed to light fluorescent lamps in an ambient temperature of __________ degrees F or higher.

A) 25
B) 40
C) 50
D) 63

Question 29

The NEC requires a minimum of __________-20 ampere bathroom branch circuit in a dwelling unit.

A) 1
B) 2
C) 3
D) 4

Question 30

An electrician tests a three-way switching circuit.The lighting load can be turned OFF and then ON at each of the three-way switch locations.However, when one three-way switch toggle is left in the up position, toggling the other three-way switch does not cause the lighting load to come on.The likely cause is __________.

A) an open grounding path
B) an open grounded path
C) the traveler wires are incorrectly connected to the traveler terminals on the switch
D) there is no electrical power at the switch

Question 31

Type NM cable must be secured no more than ____________________ inches from each single-gang nonmetallic device box.

Question 32

An electrician tests a 30-ampere, 250-volt dryer receptacle with a voltage tester.The tester indicates 120 volts between the X and Y slots.The tester also indicates 240 volts between the X and W slots.The tester also indicates 0 volts between the Y and the grounding slot.The likely cause is __________.

A) an open grounding path
B) the wires are reversed between the W and the Y slots
C) the wires are reversed between the X and the Y slots
D) an open grounded conductor

Question 33

If a receptacle is wired correctly, the short slot is always the ____________________ slot.

Question 34

A feed-though condition may cause false readings during circuit testing and can happen when a load is still connected to the circuit being tested.

Question 35

Recessed lighting fixtures installed in insulated ceilings so that the insulation is covering the fixture must be labeled ____________________.

Question 36

Explain "feed through" as it applies to using a continuity tester when testing a lighting circuit.

Question 37

NEC Table __________ contains the requirements for direct burial of conductors and raceways.

A) 110.26
B) 220.12
C) 300.5
D) 310.15(B)(16)

Question 38

An electrician is testing a circuit where a single-pole switch controls an LED lighting fixture in a bedroom.When the single-pole switch is toggled ON, the lighting fixture does not come on.Which of the following items could not be a cause for this?

A) there is an open grounding path
B) the circuit breaker protecting the circuit is off
C) there are no lamps installed in the lighting fixture
D) the connections to the lighting fixture are not making a good connection

Question 39

In the NEC, Article __________ contains requirements for grounding and bonding residential electrical systems.

A) 200
B) 230
C) 240
D) 250

Question 40

When testing a "live" 120-volt receptacle using a voltage tester, you should get a 120-volt reading when measuring from the grounded conductor connection (long slot) to the grounding conductor connection (U-shaped slot).

Question 41

Describe what a circuit tracer does and when it is used.