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electrical test Flashcards

1
Q

At buildings were communication systems are likely to be used, and inter-system bonding termination shall be provided for the communications systems at an accessible location at the service equipment. It shall be an aluminum or copper bus bar not less than 1/4 in thick by 2 in wide and be of sufficient length to accommodate at least________ terminations for communication systems in addition to other connections.

A

3

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2
Q

The ampacity of a conductor is defined by the NEC to be the maximum current, and amperes, a conductor can carry continuously under the conditions of use without exceeding__________

A

It’s temperature rating

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3
Q

I disconnect switch and closer install in a class 2, division 2 locations shall be listed as

A

Dusttight

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4
Q

The interior of enclosures or raceways install underground Shelby considered as a _______ location

A

Wet

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5
Q

Determine the ampacity (current-carrying capacity) of four size 1/0 awg THE copper current carry conductors install in a common Raceway with an ambient temperature of 86° f.

A

120 amperes

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6
Q

The NEC states each building or other structure shall have only one disconnecting means unless

A

The multiple disconnecting means consists of no more then six, and are housed in separate enclosures with a main service disconnecting means in each enclosure

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7
Q

The NEC defines a continuous load to be a load where the maximum current on the circuit is expected to be continued for at LEAST _______ hours or more

A

Three (3)

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8
Q

Given: You have determined a conductor has a computer ampacity of 74 amperes. What is the MAXIMUM standard ampere rating of the over current protection device the NEC permits to protect this circuit where this is not a motor circuit or part of a multi outlet branch circuit supplying more than one receptacle

A

80 amperes

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9
Q

A 208-vilt, 3-phase, 50 ho, squirrel-cage, continuous-duty, ac motor has a full-load running current rating of _____.

A

143 amperes

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10
Q

Which of the following is permitted in the dedicated electrical space above an indoor installed 3-phase, 480y/277-volt panelboard?

A

Sprinkler protection

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11
Q

Determine the Minimum trade size electrical metallic tubing (EMT) required to enclose eight (8) size 6 AWG copper conductors with THHW insulation, when installed in a 50 foot conduit run.

A

11/4 in

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12
Q

When exceptions are not applicable, when a feeder supplies a continuous low of 240 amperes, the overcurrent protection device protecting this circuit shall have a rating of at LEAST ______ .

A

300 Amperes
240 amperes x 125% = 300 amperes

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13
Q

Liquidtight flexible metal conduit (LFMC) shall be securely fastened WITHIN _______ space of each box or other conduit termination.

A

12 inches or 1’

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14
Q

Where a pull box to be installed will contain conductors of size 4 AWG and larger, and a straight pull of the conductors is to be made, the length of the box shall NOT be less than _______ times the trade diameter of the largest conduit entering the box.

A

Eight or 8

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15
Q

Conduit or tubing nipples not over 24 inches in length might be filled to a maximum of ______ of their cross- sectional area.

A

60%

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16
Q

Determine the MAXIMUM Number of size 14 AWG THHN conductors permitted to be installed in a trade size 3/8 in. Flexible metal conduit (FMC) that contains a bare size 14 AWG grounding conductor, when the FMC has external fittings.

A

4

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17
Q

A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected to, is recognized as a ________ in the NEC.

A

Controller

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18
Q

What is the MAXIMUM distance permitted between supports of straight runs of threaded trade size 2 in. Ridgid metal conduit (RMC)?

A

16 feet

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19
Q

A general-use snap switch with an ampere rating of NOT less than _____ shall be permitted as the motor controller for a single-phase 2 hp, 240-volt motor.

A

24 amperes 12 amperes x 2 = 24 amperes

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20
Q

Which of the following listed types of storage batteries is NOT permitted for use as a source of power for emergency systems?

A

Automotive. Section 700.12(C)

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21
Q

In guest rooms of hotels, motels, and sleeping rooms of dorms a MINIMUM of _____ general-purpose receptacles installed in the room is/are required to be readily accessible.

A

two 210.60(B) requires at least two

22
Q

A listed _____ shall be installed in or on all emergency systems switchboards and panelboards.

A

surge protective device (SPD) Section 700.8 requires emergency systems panelboards and switchboards

23
Q

Where a size 4 AWG or larger conductor enters a panelboard, which of the following must be provided?

A

An insulated bushing. Section 300.4(G) is to reduce that stress and requires an insulated bushing

24
Q

Class _____ locations are those that are hazardous because of the presence of easily ignitable fibers or where materials producing combustible flyings are handled, but in which such fibers/flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures.

A

III. Section 500.5(D).

25
Q

A single-phase, 240-volt, 15 kVA standby generator may be loaded to a MAXIMUM of _____ per line.

A

62.50 amperes. 15 kVA x 1,000 = 15,000 = 62.50 amperes (1)
240 volts 240

26
Q

All motors shall be considered as _____ unless the nature of the apparatus it drives is such that the motor will not operate continuously.

A

continuous duty. Section 430.33

27
Q

Where the motor controller also serves as a disconnecting means, it shall open all _____ conductors to the motor.

A

ungrounded. Section 430.84

28
Q

Before demand factors are taken into consideration for commercial buildings, general-purpose receptacle loads are to be computed at NOT less than _____ per outlet.

A

180 VA. Section 220.14(I)

29
Q

Conductors with ______ insulation have a greater ampacity when used in a dry location compared to when used in a wet location.

A

THHW Refer to Table 310.4(A)

30
Q

Isolating devices or equipment disconnecting means of solar photovoltaic systems shall be installed in circuits connected to equipment at a location within the equipment, or within sight and within at LEAST ______ of the equipment.

A

10 feet. Section 690.15

31
Q

A single-phase, 125-volt receptacle installed to serve a washing machine in the laundry room of a dwelling unit must be installed within at LEAST ______ of the intended location of the appliance.

A

6 feet. Section 210.50(C)

32
Q

When ambient temperature is not a factor, a size 8 AWG single copper conductor with type FEPB insulation, installed in free air, will have a MAXIMUM allowable ampacity of _____.

A

80 amperes. Table 310.17

33
Q

For the purpose of determining conductor fill in a device box, a single-pole switch and/or a three-way switch is counted as equal to _____ conductor(s), based on the largest conductor connected to the switch.

A

two. Section 314.16(B)(4)

34
Q

When determining the required ampacity of the branch-circuit conductors to supply a 3-phase, continuous-duty ac motor, current values given on _____ shall be used.

A

Table 430.250 of the NEC

35
Q

Three-way and four-way switches shall be wired so that all switching is done _____.

A

only in the ungrounded circuit conductor. Section 404.2(A)

36
Q

Determine the MAXIMUM number of size 1 AWG XHHW compact conductors permitted in a trade size 3 in., rigid Schedule 40 PVC conduit more than 24 inches long.

A

21.

37
Q

Infrared commercial and industrial heating appliances shall have overcurrent protection NOT exceeding _____.

A

50 amperes. Section 422.11(C).

38
Q

Class _____ hazardous locations are those in which flammable liquid-produced vapors, or combustible liquid-produced vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.

A

Class I locations are those locations where the handling or processing of volatile flammable liquids such as gasoline or flammable gases such as propane take place

39
Q

In indoor areas where walls are frequently washed, such as laundries or car washes, metallic conduit and metallic panelboards shall be mounted with a MINIMUM _____ space between the wall and conduit or panelboard when the equipment is installed exposed.

A

1/4 in. Section 300.6(D)

40
Q

Armored cable (Type AC) installed horizontally through wooden or metal framing members is considered supported where the support doesn’t exceed _____ intervals.

A

4½ feet. Section 320.30(C)

41
Q

What is the MAXIMUM overcurrent protection allowed for the protection of resistance-type electric space heating equipment?

A

60 amperes. Section 424.22(B).

42
Q

Information technology equipment shall be permitted to be connected to a branch circuit by a listed power-supply cord having a length NOT to exceed _____.

A

15 feet. 645.5(B)(1)

43
Q

All 125-volt, single-phase, 15- or 20-ampere receptacle outlets installed within at LEAST _____ of the outside edge of a dwelling unit bathtub or shower stall require GFCI protection.

A

6 feet. Section 210.8(A)(9)

44
Q

The purpose of an intersystem bonding termination is to provide a means for connecting _____ to the grounding electrode system.

A

bonding conductors for communications systems.

45
Q

Direct-buried conductors emerging from grade shall be protected by raceways or covers up to at LEAST _____ above finished grade.

A

8 feet. Section 300.5(D)(1)

46
Q

What is the MINIMUM size wire type equipment grounding conductor for a 50 ampere branch circuit as required by the NEC?

A

10 AWG. Section 250.122 equipment grounding conductors

47
Q

Disregarding exceptions, all 3-phase, 4-wire, 480Y/277-volt, electrical services, require ground-fault protection for each service disconnecting means when rated for at LEAST _____ or more.

A

1,000 amperes. Section 230.95

48
Q

Determine the conductor ampacity given the following related information:

conductors are size 500 kcmil copper
conductor insulation is THWN
eight (8) current-carrying conductors are in the raceway
ambient temperature is 125 deg. F
conduit length is 50 feet
installation is a wet location

A

178.2 amperes.

Size 500 KCMIL THWN copper ampacity before derating =
380 amperes
380 amperes x .67 (temp. correction) x .7 (adjustment factor) = 178.22 amperes

49
Q

When connecting to luminaires, trade size 3/8 in. flexible metal conduit (FMC) is permitted to enclose tap conductors, provided the length of the FMC does NOT exceed _____.

A

6 feet. Section 348.20(A)(2)

50
Q
A

Electrical journeyman test (4 decks)

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