Deck 16: Branch Circuits for the Garage and Outdoors

Question 1

Overhead conductors ____ permitted to be supported by trees.

A) are
B) are not

Answer 1

B

Question 2

Conductors suitable for use in ____________________ locations will have the letter "W" in their type designation.

Answer 2

wet

Question 3

Permanent overhead conductor spans are permitted to be supported by live or dead vegetation, such as trees.

Answer 3

False

Question 4

Minimum cover requirements for direct-buried cables and raceways under a variety of conditions are given in Table ____________________.

Question 5

When outdoor receptacles are installed where a cord will be plugged in permanently, such as for decorative lighting, the box cover ____ maintain weatherproof integrity when the cord is plugged in.

A) must
B) need not

Question 6

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

Question 7

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
D) all of the above

Question 8

According to NEC 210.52(G), at least ____ receptacle(s) must be installed in an attached residential garage.

A) one
B) two
C) three
D) no receptacles are required

Question 9

Outdoor lighting fixtures and associated equipment ____ permitted to be supported by trees.

A) are
B) are not

Question 10

The last sentence of 250.4(A)(5) states that "the earth shall not be considered as an effective ____________________."

Question 11

Explain why, in colder parts of the country, incandescent fixtures are more suitable than fluorescent for unheated spaces like garages.

Question 12

Explain the rationale for installing supplemental overcurrent protection, such as a "box cover unit" with a switch and fuse combination, to protect an appliance or utilization equipment such as a garage door opener.

Question 13

What type of cable is permitted to be used for direct burial applications?

A) Type NMB
B) Type UF
C) Type NMS
D) both a and c

Question 14

Type UF "underground feeder" cable ____ permitted to be used to supply service entrances.

A) is
B) is not

Question 15

If you are experiencing too much lamp burnout in your garage door opener, the culprit is probably vibration.

Question 16

Direct-burial cable is normally required to have a minimum of 24 inches of earth cover. Explain the conditions under which the minimum depth can be reduced to 12 inches for residential occupancies.

Question 17

Metallic conduit buried underground must be protected against ____.

A) backhoes
B) corrosion
C) galvanic action
D) all of the above

Question 18

Article ____________________ covers low-voltage lighting systems operating at 30 volts RMS or less.

Question 19

Explain why a post lamp cannot be grounded only with a local ground rod, but must have a separate grounding equipment conductor going back to the residential service.

Question 20

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