Question 1

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

Accepted Answer

The answer of Describe what a circuit tracer does and...

Question 2

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.

Accepted Answer

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

Question 3

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?

Accepted Answer

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 4

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

Accepted Answer

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

Question 5

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.

Accepted Answer

The answer of A(n) _________________________ is an unintended low-resistance path...

Question 6

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

Accepted Answer

The answer of Type NM cable must be secured no...

Question 7

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).

Accepted Answer

A) True 
 B)False

Question 8

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 __________.

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

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 __________.

Accepted Answer

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 12

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

Accepted Answer

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 13

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) __________

Accepted Answer

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

Question 14

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 __________.

Accepted Answer

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 15

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).

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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.

Accepted Answer

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

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 20: Checking Out and Troubleshooting Electrical Wiring Systems

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

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.

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?

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

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.

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

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).

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 __________.

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

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

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 __________.

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

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) __________

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).

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

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

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

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.

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