1
Permanent overhead conductor spans are permitted to be supported by live or dead vegetation, such as trees.
b. False
A minimum load of 5500 watts (volt-amperes) or the nameplate rating of the electric clothes dryer, whichever is larger, is used when calculating the dryer load for service-entrance requirements.
a. True
b. False
b. False
When electric clothes dryers and electric ranges are cord-and-plug connected, the receptacle and the cord set must be 4-wire, the fourth wire being the separate equipment grounding conductor.
a. True
b. False
a. True
If you are experiencing too much lamp burnout in your garage door opener, the culprit is probably vibration.
a. True
b. False
a. True
. To provide shock protection, low-voltage wiring systems are required by Article 411 to be ____.
a. double-insulated
b. grounded
c. supplied through isolating transformers
c. supplied through isolating transformers
What type of cable is permitted to be used for direct burial applications?
a. Type NMB
b. Type UF
c. Type NMS
b. Type UF
When an existing dryer or electric range is replaced, the NEC ____ the grounded conductor of an existing individual branch circuit to be used for grounding the appliance frame.
a. permits
b. does not permit
a. permits
A "unit switch" used as a disconnecting means for an electric clothes dryer shall ____.
a. be horsepower-rated
b. disconnects all the conductors in the appliance
c. have a nema 3r enclosure when installed outdoors
b. disconnects all the conductors in the appliance
NEC 210.70(C) addresses ____ that are used for storage and attics that contain equipment that might need servicing, such as air-conditioning equipment.
a. powder rooms
b. garages
c. basements
d. attics
d. attics
A(n) ____ is NOT an acceptable disconnecting means for appliances.
a. circuit-breaker in sight of the appliance
b. circuit-breaker or switch capable of being locked in the off position
c. horsepower-rated switch
d. attachment cord and plug
c. horsepower-rated switch
In a room that may be used as a home office, you could consider ____.
a. using 12 AWG for the home run or even for the entire branch circuit(s)
b. wiring in quadplex receptacles instead of duplex receptacles
c. using only plug-in strips that are listed by a qualified testing laboratory
d. All of the these
d. All of the these
The recommended approach to provide adequate lighting in a residential garage is to install one ____-watt lamp on the ceiling above each side of an automobile.
a. 40
b. 60
c. 75
d. 100
d. 100
The minimum depth for a 120-volt, 15-ampere, GFCI-protected circuit to an outdoor pole light run under a paved driveway is ____.
a. 6 inches
b. 12 inches
c. 18 inches
d. 24 inches
b. 12 inches
Overhead conductors ____ permitted to be supported by trees.
a. are
b. are not
b. are not
When someone decides to use a study/bedroom as a home office, ____.
a. several pieces of electronic equipment will need to be plugged in
b. the NEC requirements for lighting changes drastically
c. a special dimming ballast would be required
d. receptacle requirements will not change
a. several pieces of electronic equipment will need to be plugged in
. In a home office, the current draw is ____.
a. very low
b. average
c. very high
a. very low
According to NEC 210.52(G)(1), in each attached garage and in each detached garage with electric power, at least ____ receptacle outlet shall be installed in each vehicle bay and not more than 5½ ft (1.7 m) above the floor.
a. one
b. two
c. three
d. no receptacles are required
a. one
Prior to the 1996 NEC, ____ receptacles and cords were permitted. However, now it is mandatory that a separate equipment grounding conductor be installed to ground the frames of electric clothes dryers and electric ranges.
a. 3-wire
b. 16 AWG
c. 4-wire
d. listed
a. 3-wire
Type UF "underground feeder" cable ____ permitted to be used as service-entrance cable.
a. is
b. is not
b. is not
Which of the following is required in order to dim fluorescent fixtures?
a. fluorescent dimmer only
b. dimming ballasts only
c. oversized neutral in the branch-circuit
d. fluorescent dimmer and dimming ballasts
d. fluorescent dimmer and dimming ballasts
Outdoor lighting fixtures and associated equipment ____ permitted to be supported by trees.
a. are
b. are not
a. are
Electric washer/dryer combinations generally require a ____-ampere branch circuit similar to that required for a typical electric clothes dryer.
a. 10
b. 20
c. 30
d. 40
c. 30
When outdoor receptacles are installed where a cord will be plugged in permanently, such as for decorative lighting, the box cover ____ provide weatherproof integrity when the cord is plugged in.
a.must
The maximum overcurrent protection for ____ AWG copper conductors is 30 amperes.
a. 10
b. 20
c. 25
d. none of the above
a. 10
In accessible attics, exposed cables must be protected by guard strips when ____.
a. they are run across the top of joists
b. they are run across the face of studs
c. they are installed within 7 feet of the floor or floor joists
d. all of the these
d. all of the these