Exam 2
ground faults
A GFCI device provides protection against __________.
1
A T-8 fluorescent tube is __________ inch(es) in diameter.
GFCI
A __________ device operates by monitoring the current flow on both the ungrounded "hot" conductor and the grounded conductor
5,000A
A circuit breaker having an interrupting current rating of other than ______ shall have its interrupting rating marked on the circuit breaker.
high-intensity discharge lighting
A lamp that produces light as a result of an electric arc is using ____.
fluorescent lighting
A lamp that produces light as a result of an electric current passing through a gas is using ____.
incandescent lighting
A lamp that produces light as a result of current passing through a resistive filament is using ____.
20 amperes
According to Table 310.15(B)(16) in the NEC®, the ampacity for a 12 AWG copper conductor using the 60 degree Celsius column is ____________.
100 amperes
According to Table 310.15(B)(16) in the NEC®, the ampacity for a 3 AWG copper conductor using the 75 degree Celsius column is ____________.
seven
Bends made in interlocked or corrugated sheath Type MC cable shall have a radius of at least ______ times the external diameter of the metallic sheath.
8
Ground rods must be at least ________ feet long.
eighths
Lamp diameters are measured in __________ of an inch.
15-ampere single receptacles
On a 20-ampere rated branch circuit, which of the following types of receptacles may not be used?
30A
Plug fuses of the Edison-base type shall have a maximum rating of ______
10
The NEC® requires a clearance of at least __________ feet above final grade for service conductors where they are connected to the building, above sidewalks and other areas accessible to pedestrians.
18
The NEC® requires a vertical clearance of at least __________ feet above public streets, alleys, roads, and parking areas subject to truck traffic.
service drop
The overhead service conductors from the last pole to the point connecting them to the service entrance conductors at the building are called __________ conductors.
service point
The point of connection between the wiring of the electric utility and the house wiring is called the __________.
5-15R
The proper NEMA designation for a 15-ampere, 125-volt grounding-type receptacle is __________.
six
There shall be no more than ______ disconnects installed for each service or for each set of service-entrance conductors as permitted in 230.2 and 230.40.
True
Type AC cable installed through, or parallel to, framing members shall be protected against physical damage from penetration by screws or nails.
6 ft
Type MC cable shall be secured at intervals not exceeding
embedded in poured cement, concrete, or aggregate
Type NM cable shall not be used
SE
Type ______ cable is an assembly primarily for services.
light-emitting diodes
What do the letters "LED" stand for?
8AWG
What is the minimum size THHN conductor for a 40A load?
3AWG
What is the minimum size THHN conductor for a 75A load in an ambient temperature of 42 degrees Celsius?
4AWG
What is the minimum size THHN conductor for a 85A load with terminals listed at 75 degrees Celsius?
1AWG
What is the minimum size THW conductor for a 130A load?
4AWG
What is the minimum size THW conductor for a 60A load?
6
Where more than one ground rod, pipe, or plate is used, the grounding electrodes must be at least __________ feet apart.
fluorescent and high-intensity discharge
Which luminaires require a ballast?
base
Which of the following is not a part of a high-intensity discharge lamp?
Incandescent
Which of the following lamp types is the most inefficient?
MC
s Type ______ is a factory assembly of insulated circuit conductors within an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.