Question 1

Overhead conductors ____ permitted to be supported by trees.

Accepted Answer

Overhead conductors are not permitted to be supported by trees. This is because trees are living organisms and can grow, sway, and lose their branches, which can cause damage to the conductors and pose a danger to people and animals nearby. Instead, overhead conductors should be supported by sturdy, non-living structures such as poles or towers.

Question 2

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

Accepted Answer

wet

Question 3

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

Accepted Answer

Permanent overhead conductor spans must not rely on live or dead vegetation for support, as this would be unsafe and unreliable. Vegetation can change, move, or deteriorate, leading to potential hazards or service interruptions.

Question 4

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

Accepted Answer

The answer of Minimum cover requirements for direct-buried cables and...

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.

Accepted Answer

The use of the word "permanently" implies that the cord will not be unplugged frequently, which means that the weatherproof integrity of the box cover must be maintained at all times. Therefore, choice A, "must," is the best option.

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 ____.

Accepted Answer

According to the National Electrical Code (NEC), the minimum depth for a 120-volt, 15-ampere, GFCI-protected circuit to an outdoor pole light run under a paved driveway is 12 inches. This is to prevent damage to the wiring from the weight of vehicles passing over it.

Question 7

To provide shock protection, low-voltage wiring systems are required by Article 411 to be ____.

Accepted Answer

According to Article 411, low-voltage wiring systems are required to be supplied through isolating transformers in order to provide shock protection. Grounding and double-insulation are also important for electrical safety, but they are not the specific requirement stated in the article for low-voltage wiring systems.

Question 8

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

Accepted Answer

According to NEC 210.52(G), at least one receptacle is required to be installed in an attached residential garage.

Question 9

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

Accepted Answer

The answer of Outdoor lighting fixtures and associated equipment ____...

Question 10

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

Accepted Answer

The answer of The last sentence of 250.4(A)(5) states that...

Question 11

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

Accepted Answer

The answer of Explain why, in colder parts of the...

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.

Accepted Answer

The answer of Explain the rationale for installing supplemental overcurrent...

Question 13

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

Accepted Answer

Type UF (Underground Feeder) cable is specifically designed for direct burial applications and is suitable for use in wet locations. Type NMB (Non-Metallic Sheathed) and Type NMS (Non-Metallic Sheathed) cables are not designed for direct burial and must be protected by conduit if used underground.

Question 14

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

Accepted Answer

According to NEC (National Electric Code) 338.10(B), UF cable is not permitted for use as service entrance cable.

Question 15

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

Accepted Answer

Vibration can cause the filament in the light bulb to break, leading to lamp burnout.

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.

Accepted Answer

The answer of Direct-burial cable is normally required to have...

Question 17

Metallic conduit buried underground must be protected against ____.

Accepted Answer

The answer of Metallic conduit buried underground must be protected...

Question 18

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

Accepted Answer

The answer of Article ____________________ covers low-voltage lighting systems operating...

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.

Accepted Answer

The answer of Explain why a post lamp cannot be...

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.

Accepted Answer

The recommended approach to provide adequate lighting in a residential garage is to install one 100-watt lamp on the ceiling above each side of an automobile. This will ensure good visibility and enough lighting for any tasks that need to be performed in the garage.

Quiz 16: Branch Circuits for the Garage and Outdoors