Lesson 110 Quiz

The support requirements for ENT are located in the NEC® in Section ____.

362.30

You have to run a 240-volt circuit to a 24-amp load that is located 321 feet away from the panel. The smallest size wire you can pull in for the circuit is ___ AWG. The voltage drop can't exceed 4.8 volts. Use K = 10.9

4

The NEC® requirements for securing Schedule 40 PVC in horizontal runs are located in Section ____.

352.30

What size equipment grounding conductor is contained in 10-3 Type MC cable?

10

A branch circuit for a copy machine has 124 volts available at the circuit breaker. Because the copier draws 15.4 amps, there is a total of 13.2 volts dropped in the branch circuit conductors. With the copier operating, the voltage that would be measured at the receptacle where the copy machine is connected would be ____ volts.

110.8

A 13.9-amp, 240-volt load is connected to a 2-pole circuit breaker in a 120/240-volt, 1Ø, 3-wire panelboard using 12-2 AC cable. Use K = 11.3 and limit the voltage dropped in the circuit conductors to 2.5%. The maximum length of the cable that can be used for the circuit is ___ feet.

124

In the NEC®, voltage drop for branch circuits is covered in ___.

210.19(A) I-Note 4

EMT shall be securely fastened in place at least every ____. In addition, each EMT run between termination points shall be securely fastened within ____ of each outlet box, junction box, device box, cabinet, conduit body, or other tubing termination.

3 m (10 ft), 900 mm (3 ft)

According to the NEC®, what is the largest size of flexible metallic tubing (FMT) that can be used?

3/4 inch

____ is the Code Article that provides the requirements for Type AC cable.

320

Horizontal runs of trade size 3 Schedule 40 PVC conduit must be supported at ____ ft intervals.

6

What is the percentage of voltage drop on a 120-volt circuit? 12 AWG copper conductors were used and the load draws 20 amperes. The distance from the panel to the load is 100 feet. Use K = 12 to calculate the voltage dropped in the conductors.

6%

What is the voltage drop on a 120-volt circuit? The circuit uses 12 AWG copper conductors and has a load of 20 amperes. There is a distance of 100 feet from the panel to the load. (Use K=12)

7.35 volts

When Type MC cable is installed in horizontal runs through the holes in sheet metal studs and joists, do additional supports have to be installed (Caddy clips for example)? The MC cable is securely fastened within the required distance from any boxes or enclosures and the framing members are on 24" centers.

No

Trade size 1 Schedule 40 and Schedule 80 PVC use the same fittings (couplings and connectors). Note: PVC "connectors" are properly identified as male or female adapters.

True

When MC cable is used as the wiring method, the fittings used with the MC cable are required to be listed for MC cable.

True

Support and physical protection requirements for Type AC cable are similar to those for ____.

Type NM cable

A 3-foot long piece of LFMC (liquidtight flexible metal conduit) will be installed to connect a motor that is going to vibrate. Does the NEC® require that a separate equipment grounding conductor be installed?

Yes

A 4-foot long piece of FMC (flexible metal conduit) will be installed to connect a motor that is going to vibrate. Does the NEC® require that a separate equipment grounding conductor be installed?

Yes

When making connections to motorized appliances such as food waste disposers, washers, dryers, air-conditioners, and heat pumps that may be subject to vibration, ____ is an acceptable choice for the wiring method.

flexible metal conduit

As the length of wire in a circuit increases, the circuit resistance ____.

increases

Armored cable includes a(n) ____ to ensure a low-impedance grounding path.

internal bonding strip

When connections to motorized appliances such as food waste disposers, washers, dryers, air-conditioners, and heat pumps that may be subject to vibration are made, ____ is an acceptable choice for the wiring method.

liquidtight flexible nonmetallic conduit

Alflex® Type NM liquidtight flexible nonmetallic conduit can be installed ____.

outside in the sunlight where the temperature is -15°F in a concrete slab

Voltage drop problems can be caused by any of the following conditions: • wire too small for load served • circuit conductors too long • poor or corroded connections at terminals • conductors operating at high temperatures (higher temperatures increase resistance) The presence of one or more of these conditions causes an increase in the total ____ of the circuit.

resistance