Ch 20 -
open circuit
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.
short circuit
A(n) __________ is an unintended low-resistance path through which current flows around, rather than along, a circuit's intended current path.
ground fault
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.
continuity tester
A ____________________ can be used to find short circuits, ground faults, and open circuits in de-energized circuits
feed-though condition
A _____________________ may cause false readings during circuit testing and can happen when a load is still connected to the circuit being tested.
lighting fixtures
According to the NEC, ___________________ are not required to be installed in clothes closets.
illumination
According to the NEC, all work spaces must be provided with _____________________.
AFCI device
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) __________.
reversed polarity at the receptacle
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 __________.
reversed polarity at the receptacle
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 __________.
there is an open grounding path
An electrician is testing a circuit where a single-pole switch controls an incandescent 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?
the wires are reversed between the W and the Y slots
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 __________.
the traveler wires are incorrectly connected to the traveler terminals on the switch
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 __________.
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.
2
At least __________ 20 amp small appliance branch circuits are required to serve kitchen countertop surfaces.
in finished basements
GFCI protection is not required for 125 volt, 15- or 20 amp receptacles located __________.
ungrounded
If a receptacle is wired correctly, the short slot is always the ____________________ slot.
main panel
In a ____________________, 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.
Type NM
In residential applications, _____________ cable is permitted to pass through environmental air handling spaces perpendicular to the long dimension of the space.
250
In the NEC, Article __________ contains requirements for grounding and bonding residential electrical systems.
300.5
NEC Table __________ contains the requirements for direct burial of conductors and raceways.
no more than 6.5' above grade
Outdoor receptacles must be installed __________.
6
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.
Type IC
Recessed lighting fixtures installed in insulated ceilings so that the insulation is covering the fixture must be labeled ____________________.
50
Regular fluorescent ballasts are designed to light fluorescent lamps in an ambient temperature of __________ degrees F or higher.
False
Residential electrical systems may be grounded using only the metal water pipe system and do not need a supplemental grounding electrode.
1
The NEC requires a minimum of __________ 20 amp bathroom branch circuit in a dwelling unit.
10
The house electrical system may be grounded using a metal water pipe in direct contact with the earth for at least __________ feet.
6
The minimum length of free conductor at all boxes must be at least __________ inches.
100
The minimum size of service for a single-family dwelling unit permitted by the NEC is __________ amperes.
fuse or circuit breaker
The rating of the ______________ determines the rating of a branch or feeder circuit.
eight
Type NM cable must be secured no more than ____________________ inches from each single-gang nonmetallic device box.
1-1/4
When holes are bored through wood framing members, they must be at least __________ inches from the nearest edge of the wood member.
ungrounded conductor
When testing a 'live' 120 volt receptacle using a voltage tester, you should get a 120 volt reading when measuring from the ___________________ connection (short slot) to the grounding conductor connection (U-shaped slot).
false
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).
false
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).
polarity
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 ___________________.
high
When there is a short in a branch circuit, a high circuit resistance develops which results in _________ amounts of current flowing on the circuit.
12" for surface fluorescent fixtures
Which of the following is not a NEC requirement for minimum clearance of a lighting fixture from the storage space in clothes closets?
