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Exam 20: Checking Out and Troubleshooting Electrical Wiring Systems

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Question 21

Multiple Choice

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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

E) A) and D)
F) B) and C)

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Question 22

True/False

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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).

A) True
B) False

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Question 23

Multiple Choice

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

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

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

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

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

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.

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).

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

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

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 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 __________.

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 __________.

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) __________

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

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.

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?

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 __________.

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