129

Raceways ___ required to be completely installed between boxes before pulling in the wires.

are

A 120V clothes dryer located in a finished basement laundry room requires the following:

both

A dwelling unit unfinished area uses 12 AWG NM wiring method and a 20A OCPD. Which of the following receptacles meets the NEC® requirements?

either a or b

This piece of equipment contains 4 heating elements that are equally rated. Each has the same power and voltage rating. Refer to Figure 129.106. When the equipment is energized and the current flowing through the element connected at T3 & T4 is 10 amps, the current flowing through the branch circuit conductors between the circuit breaker and the equipment ___.

is 20 amps

This piece of equipment contains 4 heating elements that are equally rated. Each has the same power and voltage rating. Refer to Figure 129.106. When the equipment is energized and the power used by the element connected at T3 & T4 is 1.2 kW, the power used by the equipment (all 4 elements) ___.

is 4.8 kW

What is the minimum trade size EMT required to contain four 8 AWG THHN/THWN copper conductors?

none of these

What is the minimum trade size FMC required to contain three 1/0 AWG THHN/THWN copper conductors?

none of these

Tamper-resistant receptacles are required in a dwelling unit basement.

true

From NEC® Table 8 in Ch 9, the overall diameter of a 1/0 bare stranded copper conductor is ___ inches.

.372

The overall diameter (including insulation) of a 250 kcmil THHN/THWN copper conductor is ___ inches at the ?. The conductor shown below is close to its actual size.

.711

HVAC equipment is located in a finished mechanical room in a dwelling unit basement. How many receptacle outlets are required?

1

What is the minimum number of receptacles required in an unfinished basement?

1

What is the minimum size LFMC (liquidtight flexible metal conduit) required where sixteen 10 AWG THHN/THWN copper conductors are to be pulled into the conduit?

1

What minimum size Schedule 40 PVC conduit is required where the following conductors are to be installed?Two #2 THHN/THWN plus One #4 THHN/THWN

1

A piece of FMC (flexible metal conduit) must be at least a trade size ___ where twelve each 8 AWG THHN/THWN conductors are to be installed.

1 1/4

Eleven #12, five #10, and six #6 THHN/THWN conductors will be installed in a run of EMT. The smallest trade size EMT you can use is ___.

1 1/4

Trade size ___ is the minimum size Schedule 40 PVC (rigid polyvinyl chloride conduit) that can contain thirteen 8 AWG copper THHN/THWN conductors.

1 1/4

What is the minimum size Schedule 40 PVC required where sixteen 10 AWG THHN/THWN copper conductors are to be pulled into the conduit?

1 1/4

What is the minimum trade size EMT required to contain three 1/0 AWG THHN/THWN copper conductors?

1 1/4

When they are installed in a conduit with other circuits, 10 AWG THHN/THWN circuit conductors can carry ___ amps. There are a total of 32 current-carrying conductors in the conduit. The conduit is run 20 feet from the panel to a pull box. The conduit is located above the ceiling where the temperature is 125 degrees Fahrenheit. Don't forget to use the Table 310.16 in the 90° C column.

12.16

Both the schematic (near right) and the pictorial drawing (far right) are shown. The fixed resistance of EACH of the four elements in the furnace is 40 ohms. Refer to Figure 129.104. If the leads of a voltmeter are placed at T3 and T4, the meter will indicate ___ volts.

120

When the corrected ampacity of a 10 AWG copper conductor is 12.86 amps, the maximum size circuit breaker permitted to protect the conductors is ___.

15

There is a total of 29 current-carrying conductors in a conduit. The conduit contains both 10 AWG and 12 AWG THHN/THWN copper conductors. The 10 AWG conductors now have a corrected ampacity of ___ amps.

18

How much current can a #10 THHN/THWN conductor carry where it is installed in a conduit with other wires? There are eight current-carrying conductors in the conduit. The conduit is installed through the bar joists above the ceiling where the temperature is 141 degrees Fahrenheit. Don't forget to use the 90°C column in NEC® Table 310.16 for ampacity correction.

18.2

The duct heater contains 4 heating elements that are equally rated. Each has the same power and voltage rating. An equivalent schematic is shown at the right. Refer to Figure 129.105. If the resistance of each element is 20 ohms, the duct heater will draw ___ amps.

24

A short length of EMT is run between two panels. The ampacity values for the conductors in this EMT need not be derated, as long as the length of the EMT does not exceed ___.

24 inches

The duct heater contains 4 heating elements that are equally rated. Each has the same power and voltage rating. An equivalent schematic is shown at the right. Refer to Figure 129.105. The voltage applied to element R2 is ___ volts.

240

According to Table 4 in Chapter 9 in the NEC®, the total cross-sectional area of a 2" FMC is ___ in2.

3.269

Trade size ___ is the minimum size RMC (rigid metal conduit) that can contain six 8 AWG copper THHN/THWN conductors.

3/4

What is the minimum trade size Schedule 80 PVC required to contain four 8 AWG THHN/THWN copper conductors?

3/4

A furnace with four resistance-heating elements installed is shown above at the left. The schematic for this equipment is shown at the right. Each element is rated at 1,200 watts at 250 volts. What is the total power delivered by the furnace (all four heating elements together) when connected to the 480-volt circuit shown in Figure 128.303?

4,424

Before corrections, the maximum allowable ampacity of a 10 AWG copper THHN/THWN conductor is ___ amperes.

40

Both the schematic (near right) and the pictorial drawing (far right) are shown. The fixed resistance of EACH of the four elements in the furnace is 40 ohms. Refer to Figure 129.104. When connected to the circuit, the total current drawn by the furnace (all four heating elements together) is ___ amps.

6

Receptacles in a finished basement must be installed such that no point measured horizontally along the floor line of any wall space is more than ___ feet from a receptacle outlet.

6

Refer to Figure 128.301. The total heating element load will deliver ___ kW of power.

6.092

Refer to Figure 128.301. The total resistance of the circuit is ___ ohms.

7.1

Seven 1/0 AWG THHN/THWN copper current-carrying conductors are installed in a conduit. The conduit is installed in an area where the summertime temperature is 152ºF. What is the maximum size OCP permitted to protect the conductors in the conduit?

70

A cross-sectional representation is shown at the right. This is a 1 1/2 trade size RMC with the approximate dimensions. A single 3 AWG THWN/THHN conductor is shown lying inside the conduit. If a run of conduit was made between two pull boxes, the maximum number of these 3 AWG conductors that can be installed in the RMC is ___. To answer correctly, refer to the NEC®requirements.

8

A raceway with two, 3-wire branch circuits consists of four ungrounded conductors and two grounded conductors. All of the circuit conductors are current-carrying. The ampacity of these conductors must be based on ___ percent of the ampacity values as found in Table 310.16.

80

What part of the NEC® is a reference for calculating conduit fill where all conductors are the same size?

Annex C

The number of conductors permitted in 80 PVC is specified in Table ___.

C.10, Annex C

Which of these trade size 1/2 inch raceways has the smallest inside diameter? Refer to the appropriate table among those shown in NEC® Chapter 9 - Table 4.

Electrical Nonmetallic Tubing

A 30A 240V receptacle is located in a finished basement 7 feet from a utility sink. This requires the following:

Ground-fault circuit protection

Which of the following locations are required to have GFCI protection for receptacles? I. Unfinished basement II. Finished basement

I and II

Using Table 4 in Chapter 9 in the NEC®, which of the following 21/2-inch raceways has the smallest cross-sectional area?

Schedule 40 PVC (rigid polyvinyl chloride conduit)