Lesson 132

What is the maximum voltage between circuit conductors when using plug fuses? Select one: a. 125 b. 150 c. 250 d. 300

a. 125

Generally, overcurrent devices ___ permitted to be connected to the grounded circuit conductor. Select one: a. are b. are not

b. are not

Generally, an overcurrent protective device is not permitted to be continuously loaded to more than percent of its rating. Select one: a. 100 b. 50 c. 125 d. 80

d. 80

When used within an enclosed or confined space, the space must be certified as_ if a conventional light string is used. Select one: a. "Safe for Energized Work" b. "Safe for Work" c. "OK to use conventional string" d. "Safe Work Area"

a. "Safe for Energized Work"

Which of the following is a type of circuit condition? I. ground fault II. short circuit Select one: a. I& II b. Il only c. I only d. neither I nor II

a. I& II

Which of the following is a type of circuit condition? I. short circuit Il. Overload Select one: a. I& II b. Il only c. I only d. neither I nor II

a. I& II

A fused switch is permitted to be located I. in the bathroom in a house II. in an electrical room in a school III. in a bathroom in a hotel room Select one: a. Il only b. Il & III only c. I, II & III d. I & III only e. Ill only

a. Il only

Some portable light strings must be grounded. Select one: a. True b. False

a. True

Guards around the lamps in a conventional light string _ necessary. Select one: a. are b. are not

a. are

Usually, panelboards are constructed to have a depth that is_ than that of a load center. Select one: a. deeper b. shallower

a. deeper

If a circuit breaker trips, you should Select one: a. determine why it tripped before resetting the breaker b. immediately reset the breaker

a. determine why it tripped before resetting the breaker

Scenario 132.31 Circuit #1 has all conduit fittings tight and the equipment grounding conductor is bonded to each metal box. Circuit #2 has loose conduit fittings and the equipment grounding conductor was not bonded to each metal box. Refer to Scenario 132.31. The total resistance of the ground-return path is _. Select one: a. lower in Circuit #1 b. higher in Circuit #1 c. the same as Circuit #2

a. lower in Circuit #1

Does the NEC® permit a panelboard to be installed in a bathroom in a dwelling? Select one: a. No b. Yes

a.No

Which of the following circuit conditions will cause a circuit breaker to trip? I. short-circuit II. overload IlI. normal Select one: a. I only b. I & Il only c. Il only d. I, II & III e. Il & IlI only

b. I & Il only

Which of the following are standard size circuit breakers? I. 3,500 II. 4,000 III. 4,500 Select one: a. I, II & Ill b. II only c. I only d. I & II only e. III only

b. II only

Which of the following is a type of circuit condition? I. selective coordination Il. overload Select one: a. I & II b. Il only c. I only d. neither I nor II

b. Il only

Refer to Figure 132.101. The panel shown is 120/208-volt, 3Ø, 4-wire. The disconnect switch is fused with plug fuses and supplied from a 2-pole breaker in space 6-8 in the panel. Is this a Code violation? Select one: a. Yes b. No

b. No

When a load calculation results in an ampere rating that does not match the ampacity of the conductor, which of the following is permitted? Select one: a. Select an OCPD rated at not more than twice the ampacity of the conductor. b. Select an OCPD of the next higher standard ampere rating. c. Select an OCPD rated at not more than 125% of the ampacity of the conductor.

b. Select an OCPD of the next higher standard ampere rating.

When installed in a safety switch, fuses __ permitted to be connected to a neutral conductor. Select one: a. are b. are not

b. are not

When you change a broken lamp, you_ need to disconnect the power from the light string as long as you wear gloves. Select one: a. do not b. do

b. do

To provide accurate protection for prolonged overloads, a dual-element, time-delay fuse will open after about 10 seconds at a current of_ times the fuse rating. Select one: a. two b. five c. ten d. six

b. five

The panel shown in Figure 132.101 is 120/208-volt, 3Ø, 4-wire. The disconnect switch is fused with plug fuses and supplied from a 2-pole breaker in space 6-8 in the panel. This ___ a Code violation. Select one: a. is b. is not

b. is not

Generally, fuses must be__. Select one: a. accessible b. readily accessible

b. readily accessible

Which of the following are standard size circuit breakers? I. 90 II. 100 Select one: a. I only b. Il only c. both I & II d. neither I nor II

c. both I & II

Which of the following is a true statement about a load that draws 35 amps? I. The circuit conductors must be able to carry at least 35 amps. II. The circuit breaker must be rated for at least 35 amps. Select one: a. I only b. II only c. both I & II d. neither I nor II

c. both I & II

According to Ohm's Law, when all conduit fittings are tight and the equipment grounding conductors are bonded to each metal box, the total resistance of the ground-return path _. Consequently, when a ground fault occurs, the overcurrent protective device (fuse or breaker) can open as quickly as possible because the fault current is as high as possible. HINT: I = E = R Select one: a. is increased b. stays the same regardless c. is decreased

c. is decreased

In general, overcurrent protection of conductors is__. Select one: a. sized according to the connected load b. sized according to the size of the neutral conductor c. sized according to the ampacity of the conductor

c. sized according to the ampacity of the conductor

When using portable light strings, you should inspect the wiring and fixtures to make certain that the__. Select one: a. plug ends are intact b. outer insulation is not damaged c. fixtures are not cracked d. all of these

d. all of these

What determines the breaker or fuse size installed in a circuit? Select one: a. circuit voltage b. circuit resistance c. circuit capacitance d. circuit current

d. circuit current

Which of the following are standard size circuit breakers? I. 120 II. 130 Select one: a. I only b. Il only c. both I & II d. neither I nor II

d. neither I nor II

The NEC® has limitations on where OCPDs, such as panelboard installations, can be installed due to the presence of combustible materials. These are specified at Select one: a. 314.20 b. 410.12 c. 422.17 d. 430.14(B) e. 240.24(D)V

e. 240.24(D)V

The Code reference that specifies the voltage system that can be used for plug-fuse installations is Select one: a. 240.50(A)(1) b. 240.60(A)(2) c. 240.60(A)(1) d. 230.90(A) e. 240.50(A)(2)

e. 240.50(A)(2)

Which of the following are standard size circuit breakers? I. 325 II. 350 III. 375 Select one: a. II & Ill only b. I & II only c. I, II & Ill d. I only e. II only

e. II only

Which of the following types of current travel through a circuit breaker? Select one: a. short-circuit b. ground-fault c. normal d. overload e. all of these

e. all of these