Deck 14: Branch Circuit Installation

Question 1

The receptacle installed for a clothes washing machine located in a laundry area of an unfinished basement or a bathroom must be GFCI protected.

Answer 1

True

Question 2

A receptacle located under a kitchen sink for a cord-and-plug-connected garbage disposal must be GFCI protected.

Answer 2

False

Question 3

A(n) __________ circuit breaker has a trip time that gets faster as the fault current flowing through it gets larger.

A) dual-element
B) inverse time
C) plug fuse
D) type S

Answer 3

B

Question 4

The NEC permits low-voltage Class 2 doorbell cable to be run next to 120 or 240 volt branch circuits wired with nonmetallic sheathed cable.

Question 5

HACR is an acronym found on some circuit breakers and stands for 'heating, air conditioning, and ventilation'.

Question 6

The NEC requires most motor applications to be protected by overload devices sized not more than __________ of the motor's nameplate current rating.

A) 100%
B) 115%
C) 125%
D) 150%

Question 7

In the NEC, a bathroom is defined as an area that has a basin, a toilet and a __________.

A) urinal
B) tub
C) shower
D) Any of the above

Question 8

If a counter mounted cooktop unit has a nameplate rating of 7300 watts at 240 volts, the current draw will be __________ amperes.

A) 30.41
B) 41.65
C) 60.83
D) 72.6

Question 9

In a laundry room, receptacles must be placed so that no point along the wall is more than six feet from a receptacle.

Question 10

A receptacle for a gas-fired range is permitted to be connected to a small appliance circuit.

Question 11

Smoke detectors in homes must be hardwired to the electrical system but may have battery backup.

Question 12

The working space requirements of Section 110.26 in the NEC must be maintained when the disconnecting means for an air conditioning unit on the outside of the house is installed.

Question 13

A general lighting branch circuit installed in a house and protected by a 15-ampere circuit breaker may be wired with a __________ AWG copper conductor.

A) 14
B) 12
C) 10
D) Any of the above

Question 14

Electric water heaters must be wired with a three-wire cable because the white conductor in a two-wire cable is not permitted to be used as an ungrounded conductor in this type of installation.

Question 15

In an electric motor circuit the size of the circuit breaker and the circuit conductors is determined by the __________ of the motor.

A) horsepower rating
B) full load current
C) voltage rating
D) All of the above

Question 16

Electric ranges installed in houses are typically wired for __________ volt operation.

A) 120
B) 208
C) 240
D) 120/240

Question 17

There is no maximum number of receptacles allowed on 15, or 20 amp branch circuits in a house but it is suggested that the maximum number of receptacles permitted on a 15-amp rated circuit be no more than 10 and the maximum number of receptacles permitted on a 20-amp rated circuit be no more than __________.

A) 12
B) 13
C) 14
D) 15

Question 18

The minimum number of small appliance circuits required by the NEC in each house is __________.

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

Question 19

The NEC requires at least one 15 or 20 amp, 125 volt receptacle in a bathroom and it must be located no more than __________ inches from the edge of the basin.

A) 8"
B) 12"
C) 30"
D) 36"

Question 20

If a new electric clothes dryer is being installed in a home built before 1996 that has a three-wire cord-and-plug connection, the circuit must be replaced to accept a four-wire cord and plug.

Question 21

The NEC requires that small appliance branch circuits be protected with ____________________-ampere overcurrent protection devices.

Question 22

A ____________________-ampere overcurrent protection device is required for a residential general purpose branch circuit wired with a 12 AWG copper conductor.

Question 23

A(n) _________________________________ is a fuse type that has a time-delay feature built into it and is often used as an overcurrent protection device for electric motor circuits.

Question 24

When installing a receptacle for a cord and plug connected appliance, the receptacle must be located no more than __________ feet from the appliance.

A) 2
B) 5
C) 6
D) 8

Question 25

Which table in the NEC is used to determine the maximum rating of the motor short circuit and ground fault protection device (fuse or circuit breaker)?

A) Table 250.66
B) Table 310.104(A)
C) Table 430.52
D) Table 8, Chapter 9

Question 26

A hot water heating system is sometimes referred to as a(n) __________ heating system.

A) forced air
B) gas
C) electric
D) hydronic

Question 27

When determining the amount of electric heating to be installed in a house the rule of thumb is to use _______ watts per square foot for each heated area in a house.

A) 10
B) 100
C) 1
D) 50

Question 28

Who decides whether 15 or 20 amp rated general lighting circuits will be installed in a residential electrical system?

A) The homeowner
B) The architect
C) The electrical contractor
D) The plumber

Question 29

If an electric water heater is connected to water piping with connections that are designed so the water heater can be quickly and easily removed, a flexible cord and plug connection is allowed.

Question 30

Which NEC Table will tell you the full load current for a single-phase electric motor?

A) Table 310.15(B)(16)
B) Table 430.248
C) Table 8, Chapter 9
D) Table 430.250

Question 31

Most residential electric water heaters operate on 240 volts, are wired with 10 AWG conductors, and are protected with a __________-ampere overcurrent protection device.

A) 20
B) 30
C) 40
D) 50

Question 32

A(n) __________-colored switch cover is used to identify an oil burner safety switch.

A) orange
B) red
C) blue
D) yellow

Question 33

If an electric clothes dryer has a rating of 6 kW at 120/240 volts, it will draw ____________________ amperes.

Question 34

While there is no limit to the number of receptacles that can be connected to a general lighting branch circuit, a good rule of thumb is to assign each receptacle outlet a value of ____________________ amperes.

Question 35

Instead of installing the required bathroom receptacle on a wall or partition adjacent to the basin, it may be installed on the side or face of the basin cabinet, as long as it is located no more than __________ inches below the countertop.

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

Question 36

Where should carbon monoxide (CO) alarms be mounted?

A) near bedrooms and living areas
B) where occupants where hear the alarm while sleeping
C) on each level of a home and out of reach of children
D) all of the above

Question 37

On an individual branch circuit where no other items are served by the circuit, an air conditioner load cannot exceed __________ of the branch circuit ampacity.

A) 50%
B) 70%
C) 80%
D) 100%

Question 38

The NEC requires a laundry circuit to be rated at ____________________ amperes.

Question 39

A wall-mounted electric oven has a nameplate rating of 9 kW at 240 volts. The rated current is ____________________ amperes.

Question 40

The chime transformer is used to transform the 120 V residential circuit voltage down to the voltage that a chime system will operate on, usually ____________________ volts.

Question 41

Explain why some areas of the country have a high number of homes heated by electric heat, while in other parts of the country most homes are heated by oil or gas.

Question 42

When an installation technique is used that brings the circuit conductors directly to an electrical appliance and then terminates them at the appliance, the appliance is said to be ____________________.

Question 43

Explain what a carbon monoxide detector does.

Question 44

Discuss some of the drawbacks to wireless chimes.

Question 45

Explain how smoke detectors work.