Lesson 113 - GFCI, AFCI, and Other Special-Purpose Receptacles Quiz

6 (2017 NEC: 330.30(B))

What is the maximum distance permitted between straps (supports) where 12-2 Type MC cable is run for some distance between boxes or enclosures? ___ feet

True

Although the National Electrical Code contains requirements for making holes and notches in framing members, in order to protect the cables installed in them, electricians must also be aware that building codes also have requirements for holes and notches in framing members, in order not to weaken the structure of the building.

used to support luminaires (2017 NEC: 352.10 | 2017 NEC: 352.12(B))

As covered by Article 352, rigid nonmetallic conduit is permitted to do all of the following, except where ___.

3 m (10 ft), 900 mm (3 ft) (2017 NEC: 358.30(A))

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.

6 (2017 NEC: 352.30 (Table))

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

3 (Voltage at the fixtures = 211 - V d = 208 mc010-1.jpg V d = 3 volts cma = 2KIL ÷ V d = (2 × 12 × 15.182 × 350) ÷ 3 = 42510 cmils mc010-2.jpg 3 AWG 2017 NEC: Ch 9-T. 8)

Refer to Figure 110.16. You are to run 320 feet of PVC underground from a panel to a 30-foot-tall parking lot light pole. Install copper THHN/THWN circuit conductors from the breaker to the luminaires on top of the pole. The luminaires will draw a total current of 15.182 amps. The voltage measured at the circuit breaker is 211 volts. In order to supply at least 208 volts to the luminaires, the smallest size wire is ___ AWG. Use NEC ® Chapter 9, Table 8 and K=12.

3 5 (2017 NEC: 210.19(A)(1) I-Note 4)

The Code recommends a voltage drop no greater than ___ percent for feeders and no greater than ___ percent total for feeders and branch circuits together.

II only

The fitting shown in Figure 110.11 at A can be used on Type MC or AC cables with ___ armor. I. aluminum II. steel

1 (2017 NEC: 350.30(A))

The maximum distance permitted between a box and the first strap (support) for an installation using 1" LFMC (liquidtight flexible metal conduit) is ___ ft.

202.8 (208 - (208)(.025) = 202.8 volts)

The specifications require that you limit the voltage drop on any circuit to 2.5%. For a 208-volt circuit, this means that the voltage applied to any load cannot be less than ___ volts.

resistance

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.

4 1/ 2 (2017 NEC: 320.30(B))

What is the maximum distance permitted between straps (supports) where 12-2 Type AC cable is run for some distance between boxes or enclosures? ___ feet

3.46 (V d = 2KIL ÷ cma = (2)(12)(30)(50) ÷ 10380 = 3.46 volts)

What is the voltage drop on a 120-volt circuit consisting of 10 AWG copper wire where the load is 30 amps and the distance between the panel and the load is 50 ft (Use K=12)

7.35 volts

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)

10 (2017 NEC: 330.108)

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

is (2017 NEC: 348.60)

When a 3' long piece of trade size 3/ 4 flexible metal conduit is installed (for flexibility) so that the connected equipment can vibrate freely, an equipment grounding conductor ___ required to be installed with the circuit conductors. The "flex" and the fittings are listed for grounding.

conductor

When there's a current leakage from a tool or piece of equipment, the current will flow through any available ___ until it reaches a grounded surface or grounding conductor.

1 (2017 NEC: 358.22)

When using EMT, the maximum number of conductors shall not exceed that permitted by the percentage fill specified in Chapter 9, Table ___.

12 in (2017 NEC: 330.30(B))

Where 12-2 Type MC cable is installed, the maximum distance permitted between a box and the first strap (support) is ___.

Rigid

Which of the following wiring methods provides the best protection against physical damage?