Deck 15: Special Residential Wiring Situations

Question 1

A GFCI feed-through receptacle is an acceptable means to provide the required GFCI protection to hydromassage bathtubs and their associated equipment.

Answer 1

False
Section 680.71 states that the entire circuit must be protected, so a GFCI breaker must be used.

Question 2

If the feeder supplying power to a loadcenter in a detached garage is installed with an equipment grounding conductor, the NEC does not require a separate grounding electrode system to be established at the detached garage.

Answer 2

False
Section 250.32 requires a separate grounding electrode system

Question 3

The maximum distance between receptacle outlets in a garage is __________ feet.

A) 4
B) 6
C) 12
D) There is no NEC requirement

Answer 3

D

Question 4

In attached garages, the NEC requires at least __________.

A) one single 125-volt receptacle only
B) one duplex 125-volt receptacle only
C) one wall switch-controlled lighting outlet only
D) one 125-volt, 15- or 20-ampere receptacle for each vehicle bay and one wall switch-controlled lighting outlet

Question 5

An overhead garage door is not considered an entrance or exit by the NEC and therefore does not require a lighting outlet(s) to be installed over or next to it.

Question 6

If two ground rods are installed at a detached garage, they must be located at least 12' (1.8 m) apart.

Question 7

A detached garage supplied with electrical power must always have at least one 125-volt, 15- or 20-ampere receptacle installed in each vehicle bay located not more than ' above the floor and at least one wall switch-controlled lighting outlet.

Question 8

Outdoor lighting fixtures can be mounted on trees.

Question 9

Overhead conductor spans are permitted to be supported by trees.

Question 10

PVC conduit is not permitted as the only means of support for a junction box used with underwater lighting when wiring permanently installed swimming pools.

Question 11

When used as an interior wiring method, Type UF cable must be installed according to the same rules as Type NM cable.

Question 12

When installing branch-circuit wiring in a raceway from an electrical panel inside the house to pool-associated motors, an insulated equipment grounding conductor __________.

A) must be installed
B) may be installed
C) shall not be installed
D) depends if the raceway is metallic or nonmetallic

Question 13

All 15- and 20-ampere, 125- and 250-volt nonlocking receptacles used outdoors must be listed as weather-resistant.

Question 14

Good wiring practices require electricians to install at least __________ lighting outlets in a two-car garage to provide adequate lighting.

A) 1
B) 2
C) 3
D) 4

Question 15

According to the NEC, which of the following 125-volt, 15- or 20-ampere duplex receptacles installed in a garage to serve cord-and-plug appliances, such as a refrigerator or freezer, require GFCI protection?

A) Duplex receptacles located beside the appliance
B) Duplex receptacles located behind the appliance
C) Duplex receptacles located on the wall and just above the appliance
D) All of the above

Question 16

Section 625.40 requires any receptacle outlet that is installed in a garage for the purpose of charging an electric vehicle to be supplied by a separate branch circuit and the branch circuit cannot have any other outlets on it.

Question 17

Section 210.52(G)(1) requires that at least two receptacle outlets be installed for each vehicle bay in an attached garage or a detached garage with electric power.

Question 18

Any 15- or 20-ampere, 125-250 volt receptacle installed in a wet location must have a cover or enclosure that keeps it weatherproof, but only when there isn't anything plugged into it.

Question 19

Incandescent lamps used for lighting in a garage can be replaced with LED lamps.

Question 20

If you are required to install wiring for a storage shed or other accessory building, install the wiring the same as for a detached garage.

Question 21

If a cable is buried underground to bring power to a detached garage, Type ____________________ cable is typically used.

Question 22

When bonding the various metal parts of a permanently installed swimming pool, all bonding wires must be solid copper and be ____ AWG or larger.

A) 10
B) 8
C) 6
D) 4

Question 23

The most important installation practice for a permanently installed swimming pool is the proper grounding and bonding together of all ____________________ parts in and around the pool.

Question 24

For spas and hot tubs, at least one 125-volt, 15- or 20-ampere rated receptacle must be installed at least __________ from the inside wall of the spa or hot tub.

A) 3
B) 5
C) 6
D) 10

Question 25

Assuming a 20-ampere circuit breaker and GFCI protection, the minimum burial depth for a Type UF cable running to a 120-volt pole light at a residence is __________ inches.

A) 6
B) 12
C) 18
D) 24

Question 26

In an outdoor pool area, the NEC requires luminaires, ceiling-suspended paddle fans, or lighting outlets not to be installed over the pool or an area extending __________ feet horizontally from the inside wall of the pool.

A) 5
B) 10
C) 12
D) 20

Question 27

Type UF cable can be used outdoors in direct exposure to the sun only if __________.

A) it is listed as being sunlight resistant
B) it has a sunlight-resistant marking on the cable sheathing
C) it is rated for less than 300 volts
D) both A and B

Question 28

According to the NEC, the minimum burial depth for a direct buried cable like Type UF is __________ inches.(General Rule)

A) 6
B) 12
C) 18
D) 24

Question 29

Cord-and-plug-connected lighting fixture assemblies for storage pools are permitted as long as the lamp operates at no more than __________ .

A) the low-voltage contact limit
B) 24 volts
C) 120 volts
D) 150 volts

Question 30

A permanently installed swimming pool must have at least one 125-volt, 15- or 20-ampere receptacle located a minimum of __________ feet from the inside wall of the pool.

A) 3
B) 5
C) 6
D) 10

Question 31

Locations subject to saturation with water or other liquids in unprotected areas exposed to the weather are called ____________________ locations.

Question 32

The NEC requires that if a feeder supplying a detached garage from the service in the main house has an equipment-grounding conductor installed with the feeder, the grounded conductor __________ be connected to the equipment-grounding conductor or to the grounding electrode system in the garage.

A) may
B) shall
C) shall not
D) could

Question 33

For a permanently installed swimming pool, any 15- or 20-ampere, 125 through 250 volt rated receptacle located within __________ feet of a pool's inside wall must be GFCI protected.

A) 3
B) 10
C) 12
D) 20

Question 34

The conductors that provide electrical power to permanently installed pool lighting fixtures must be GFCI protected if the voltage is above __________ .

A) the low-voltage contact limit
B) 24 volts
C) 120 volts
D) the high-voltage contact limit

Question 35

The minimum burial depth for type UF cable can be found in Table __________ of the NEC.

A) 110.26
B) 220.12
C) 300.5
D) 310.15(B)(16)

Question 36

Pool motors can be cord-and-plug connected but if they are, the cord can't be more than __________ feet long and must contain an equipment-grounding conductor sized according to Table 250.122.

A) 1
B) 2
C) 3
D) 4

Question 37

A light-sensing device used to control lighting fixtures in response to detected light levels is called a _________.

A) transfer switch
B) no-niche luminaire
C) dry-niche luminaire
D) photocell

Question 38

A welding process for joining materials that employs molten metal to permanently join the conductors together is called __________ welding.

A) stick
B) thermal
C) exothermic
D) cohesive

Question 39

Without a special ballast, fluorescent lamps installed in a garage usually will not start when exposed to temperatures below __________ degrees F.

A) 60
B) 50
C) 70
D) 80

Question 40

Article __________ in the NEC covers the requirements for swimming pools, hot tubs, and hydromassage tubs.

A) 110
B) 250
C) 440
D) 680

Question 41

Describe a multiwire branch circuit.

Question 42

Explain why a 14 AWG Type NM cable is not permitted to be used for a spa or hot tub.

Question 43

A circuit rated at 6600 watts and 240 volts will draw ____________________ amperes.

Question 44

If a conductor or cable has a(n) ____________________ in their insulation designation, such as THWN, it means that it is suitable for installation in a wet location.

Question 45

If a lighting fixture is installed under a canopy or under an open porch, it is considered to be in a(n) ____________________ location.

Question 46

A(n) ____________________ switch eliminates the possibility of a generator voltage being applied to the secondary of the utility's supply transformer.

Question 47

Receptacle outlets located outdoors that are fed using an underground wiring method and supported by conduit must have at least ____________________ conduit(s) threaded wrench-tight into the box.

Question 48

A(n) ____________________ is a rotating machine used to convert mechanical energy into electrical energy.

Question 49

Explain the benefits of the new generator-ready loadcenters.