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Exam 20: Checking Out and Troubleshooting Electrical Wiring Systems

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Question 21

True/False

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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.

A) True
B) False

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Question 22

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When testing a 'live' 50 amp, 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).

A) True
B) False

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Question 23

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

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

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

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

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).

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

An electrician is testing a 15-amp, 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 __________.

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.

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

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

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

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

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

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

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

An electrician is testing a 20-amp, 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 __________.

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 amp, 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 __________.