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Q and A sheet Flashcards

1
Q

What does FLC mean?

A

Full load current

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2
Q

An electrical device that consists of a frame, plunger, and uses an up down motion to operate is called a what?

A

solenoid

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3
Q

Types of equipment grounding conductors?
a. rigid metal conduit
b. Listed liquid titght flexible metal conduit
c. flexible metal tubing
d. Electrical metal tubing

A
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4
Q

Class 3 inherently limited power source circuits are not rated for over how many volts?

A

100 volts

(ch9 table 11.B)

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5
Q

How many #10 RHW* conductors can be placed inside a 1” ENT pipe?

A

10

(Annex C Table C.2)

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6
Q

What size RMC pipe is needed for the total square inch area (including insulation) of: (4) #8 THHN and (6) #10 THHN wires?

A

1 inch

(Table 4 and Table 5)

can’t use annex C…
8=.0366 x 4, 10=.0211*6…
over 2 wire = 40% = 1 inch

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7
Q

How many #8 THHW, compact conductors can be placed inside 1” EMT trade size conduit?

A

6

Annex C Table C.1A

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8
Q

An electrical tubing nipple is defined as tubing ___ or less in length and may be filled to a maximum of ___ % of the total available internal square inch area of the tubing.

A

24”, 60%

Ch9 Table 1 Note 4

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9
Q

Max conductor fill rate for all types of conduits (over 24” length) with over 2 conductors, including cellar concrete raceways, is?

A

40%

Ch9 Table 1

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10
Q

Hybrid communication wire shall have a min voltage of ___ volts?

A

600v

800.179(i)

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11
Q

Communication wire shall have a min voltage of ___ volts?

A

300v

800.179

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12
Q

How many inches has to be separated between class 2 and class 3 circuits?

A

2 inches

225.136(i)

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13
Q

Where a portable optional standby source is used as a ___ it shall be grounded to a grounding electrode

A

separately derived system

know 202.11a-b

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14
Q

Key things to know from Ch 6:

A

Office furnishings,

x-ray equipment,

solar photovoltaic systems,

Electric vehicle charging systems,

swimming pools,

welders (arc and resistance)

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15
Q

Direct Current Turbines shall be installed in: MC, RMC, IMC, BS?

A

MC

One Q on DC Turbine

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16
Q

Photovoltaic supply can be run in what type of raceway?

A

MC

690.31(g)(2)

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17
Q

Bonding to a pool grid must have what type of devices?

A

Pressure devices

680.26, 250.8a

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18
Q

In office furnishings, the flexible power cord shall not exceed __ in length.

A

2 feet

Know 605.9a-d, one Q

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19
Q

Neon tubing exceeding 1000V shall not be installed in?

A

Dwelling Units

600.31(l)

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20
Q

Commercial buildings with accessibility to pedestrians shall provide at least one ___ receptacle

A

20 amp

600.5A

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21
Q

What size branch circuit is required for a sign outside a commercial pedestrian door?

A

20 amp

600.5(A)

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22
Q

For photobvoltaic systems, what cannot be connected to the supply side

A

non-overcurrent light (device)

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23
Q

Indoor receptacle for an electric vehicle charging stations shall be mounted at a minimum height of?

A

18 inches

625.50

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24
Q

Outdoor receptacle for an electric vehicle charging stations shall be mounted at a minimum height of?

A

24 inches

625.50

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25
Q

Key things to know for Chapter 5:

A

Commercial garages (major v minor),

recreational vehicles,

healthcare facilities,

marinas and boatyards

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26
Q

A boat hoist receptacle shall be mounted not less than ____ above the deck surface of the pier and not below the electrical datum plane on a fixed pier.

A

12 inches

555.19

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27
Q

For a mobile home, the grounded conductor shall be ____

A

insulated

550.16(A)(1)

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28
Q

In general care areas, each patient bed shall be provided with a min of ____ receptacles.

A

8

517.17b

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29
Q

In critical care areas, each patient bed shall be provided with a min of ____ receptacles.

A

14

517.17b

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30
Q

Disconnecting means for a mobile home shall be a min of what height?

A

2 feet

550.11A

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31
Q

Anesthetizing locations shall be classified as ____

A

class 1 / division 1,

517.60(a)(1)

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32
Q

Anesthetizing locations shall extend upwards to a level of ____

A

5 feet

517.60(a)(1)

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33
Q

What type of cable can’t be used as a ground for critical and EM branch circuits of a hospital?

A

Isolated ground

517.19

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34
Q

In health care facilities, the EM light circuit shall wired on the ___

A

life safety branch circuit

517.32A

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35
Q

Occupancy of ____ people or more must be wired in MC or conduit

A

100

518.1

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36
Q

Liquid propane indoor storage tank are class ___ division ___ within 5’ of tank

A

Class 1 Division 1

514.3(B)(2)

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37
Q

In gas stations, how far from the floor up is class 1 div 1?

A

18in

514.3(b)(1)

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38
Q

An outdoors gasoline dispensing device up to 18” above grade level within 20” horizontally of any edge of the enclosure is ____?

A

Class 1 Division II

514.3(b)(1)

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39
Q

What is the max surface temp of T2A?

A

536

500.8C

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40
Q

When do you need/not need tamper proof receptacles?

A

Need: elementary school. Don’t need: high school, warehouse
406.12

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41
Q

What type of receptacle do you need for a car wash?

A

Wet location
406.???

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42
Q

Disconnections means for motor circuits rated 600V or less shall have an ampere rating not less than ___ percent of the FLC rating?

A

115%

430.110A

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43
Q

By what percent is the FLC of a wound rotor motor multiplied to determine the motors minimum OCPD using inverse time breaker?

A

150%

430.52

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44
Q

Fuses are put on the current carrying conductors as well as the grounded conductor if it is what type of motor feeder?

A

3 wire/ 3-phase

430.36

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45
Q

Conductors supplying several motors shall have an ampacity of not less than the sum of the motors plus ___ percent of the highest rated motor?

A

25%

430.24

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46
Q

A conductor supplying a single motor used in continuous duty application shall have an ampacity of ____ percent of the motor’s FLC?

A

125%

430.22

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47
Q

Branch circuits supplying two or more outlets for fixed electrical space heating equipment shall be rated for not over how many amps?

A

30 amps

424.3(A)

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48
Q

What type of cable does a garbage disposal cord have to be made of?

A

listed for use

422.16(B)(1)

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49
Q

Electrically operated kitchen waste disposers shall be permitted to be cord and plug connected with a flexible cord of not more than how many inches and not less than how many inches?

A

36 inches, 18 inches

422.16(b)(1)(2)

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50
Q

A furnace has to be run on what type of circuit?

A

Individual branch circuit

422.12

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51
Q

What is the minimum space between a recessed fixture and thermal insulation?

A

3 inches

410.116B

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52
Q

Light poles shall have a handhole of not less than ___

A

2” x 4”

410.30(B)1

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53
Q

What color triangle marking will be on noise cancelling outlet?

A

orange

406.3(D)

54
Q

A general use snap switch shall be connected to no more than what percent of its rated use?

A

80%

404.14(A)3

55
Q

Key things to know Chapter 3:

A

Anything dealing with raceways: distance between supports, termination points, installation…

Ampacities tables are in this chapter,

article 393: low voltage suspended ceiling power distribution systems
service is 75 deg F always.

56
Q

What is the max number of conductors allowed in an auxiliary gutter?

A

30

366.22(a)

57
Q

Type RTRC shall be permitted to be unsupported where the raceway is not more than __ long, and remains in unbroken length, and terminated in an outlet box.

A

3’

355.30(A)

58
Q

What is the expansion rate of 250 feet of PVC that goes from a temperature change of -20 deg F to 80 deg F.

A

10.15

{4.06*250/100}

352.44

59
Q

What is the max distance between supports for a 1” rigid PVC?

A

3 feet

352.30

60
Q

10 feet of equipment grounding conductor cannot be made of what?

A

FMC

342.20A/350.118 7b

61
Q

For gas stations, ____ can be used as a raceway under class 1 division 1, under 8 inches of fill dirt.

A

RMC

344.10C

62
Q

What type of cable is not approved for service entrance cable?

A

UF

340.12

63
Q

What is the temperature rating for the conductor of type NM CABLE?

A

60 C

344.80

64
Q

What is the max distance from a panel that a type MI cable must be secured?

A

6 feet

332.30

65
Q

Floor boxes must be made of what?

A

UL Listed

314.27(b)

66
Q

A Fixture box shall be independently supported if the fixture weighs more than how many pounds?

A

50 lbs.

314.27(A)2

67
Q

Type NM cable shall be secured how many inches from a non-metallic box if there is no clamp?

A

8 inches

3114.17C

68
Q

Type NM cable shall be secured how many inches from a metallic box if there is no clamp?

A

12 inches

3114.17C

69
Q

What is the max number of #14 conductors allowed in a 4” x 2 1/8” metal octagonal trade sized box?

A

10

314.16(A)

70
Q

What is the required free space in a junction box for a #10 conductor?”

A

2.5 cubic inches

314.16(b)

71
Q

Type NM cable shall be approved for installing under the lower edges of a joist in crawl spaces if the wire is at least three — AWG or two —- AWG

A

three #8AWG or two #6AWG

334.15(c)

72
Q

When using a round box where conductors or connectors require the use of a locknuts or bushing are to be connected, to what part of the box can they not be connected?

A

side of the box

314.2

73
Q

What type of conductor is rated for direct burial?

A

UF

310.104a, 340.10

74
Q

What is the min size THW conductor that can be used to supply a 200 amp single phase commercial building?

A

3/0 copper

310.15(b)(16)

75
Q

A Single-family dwelling has a 100-amp service. What size feeder will be required to supply a 75-amp electric space heater and a 25-amp air conditioner?

A

2

…non coionidental, use largest = 75A..feeder less than 100 = 60 deg, = #2

310.15(b)(16)

76
Q

What is the overcurrent protection for 8 #12 THNN conductors in a ½ in pipe?

A

20 amp

…pg 148:8=70%, pg 150…#12 = 30A x .7 = 20A

77
Q

What is the min size wire needed to supply a 100-amp single phase 3 wire main service on a mobile home?

A

4 copper

310.15(b)(7)

78
Q

What is the smallest size conductor you can run in parallel?

A

1/0

310.10(H)(1)

79
Q

At what rated voltage does direct burial cable have to be shielded?

A

2,000V

310.10(f)

80
Q

When direct burial exit the ground, what shall they be enclosed in?

A

Raceway

300.5(D)(4)

81
Q

The minimum distance any edge of a stud must be from the edge of a hole for nm cable is ___

A

1 ¼ inches

{300.4(a)(1)}

82
Q

What is the minimum size copper-clad grounding electrode conductor needed for a 200 amp, single phase dwelling copper feeder?

A

2 AWG

{310.15(b)(17)}{250.66}

…. 83% rule: 100-400A, take amp and multiply by 83%…200x.83 = 166A = 2.0… 2.0 = 2AWG from 250.66. pg150: 310.15.b.17…pg 119, pg 155?, 1q on copper, 1q on copper clad, 4Q ampacity
AWG {310.15(b)(17)}{250.66}

83
Q

What is the minimum size main bonding jumper for an 800 Kcmil service entrance conductor?

A

2/0

250.102C(1)

84
Q

When a metal enclosure is required to protect the grounding electyrode conductor, the enclosure has to be bonded to ____ at both ends.

A

Grounding electrode conductor

{250.64(e)}

85
Q

What size grounding electrode conductor must always be protected from physical damage?

A

6 or larger

{250.64(b)}

86
Q

What is the minimum space between ground rods?

A

6 feet

{250.53(B)}

87
Q

A ground rod shall be at least how many inches in diameter?

A

5/8 inch

{250.52(5)(b)}

88
Q

How many feet of a rod electrode need to be in contact with the earth?

A

8 feet

{250.53(g)}

89
Q

What is the minimum size wire for a ground ring?

A

2 copper

(250.52(a)(4)

90
Q

A concrete encased electrode with electrically conducted coated steel reinforcing bars shall be at least ____ in continuous length

A

20 feet

{250.64(B)}

91
Q

A concrete encased electrode with electrically conducted coated steel reinforcing bars shall be at least ____ in diameter

A

½ inch

{250.64(B)}

92
Q

High impedance ground systems operate at a minimum of what voltage?

A

480 volts

{250.36}1

93
Q

The green screw in a main panel enclosure serves as what?

A

Main bonding jumper

{250.28B}

94
Q

What is the smallest size grounded conductor you can run in parallel?

A

1/0

{250.24C}

95
Q

A grounding electrode conductor may be spliced together by: welding, cable clamps, exothermic welding, or all of the above?

A

Exothermic welding

{250.8(A)(4)}

96
Q

A type S fuse is installed in an Edison base fuse holder for what primary reason?

A

Non-interchangeable

{240.53(B)}

97
Q

What is the minimum height of a SE (service entrance?) conductor rated 600 volts going above a pedestrian sidewalk?

A

15 feet

…watch out for verticle clearance trick question voltage….

230.24(B)

98
Q

What the maximum number is of disconnects at the main service?

A

Six

{230.74?}

99
Q

What is the minimum service disconnect of a commercial building?

A

60 amps

{230.79(D)}

100
Q

What is the minimum service disconnect of a residential single family dwelling?

A

100 amps

101
Q

What cannot be connected to the supply side of a service disconnect

A

230.82, 1-9…ground …check code ref

102
Q

When fuses serve as overcurrent protection, a disconnecting means shall be supplied on the line side of all fused circuits that exceed 160 volts if the fuses are accessible to who?

A

Other than qualified personnel

{240.40}

103
Q

Edison base fuse holders shall be a maximum of what voltage?

A

125 volts

{240.51a}

104
Q

Edison base fuses shall not operate at over how many amps?

A

30 amps

105
Q

Does a vehicle garage require illumination under the illuminated entryway rule?

A

No

{210.7(D)(A2)

106
Q

Does a man door require illumination under the illuminated entryway rule?

A

Yes

{210.70(D)(A2)

107
Q

Does a service door require illumination under the illuminated entryway rule?

A

Yes

{210.70(D)(A2)

108
Q

General branch circuit lighting load for a hospital shall be calculated at ___ watts per square ft?

A

2 Watts

{220.12}

109
Q

In dwelling units, new additions to the lighting branch circuit shall be calculated in accordance with 220.12 when over ____ sq ft

A

500 sq ft

{220.16(A)1}

110
Q

Where SE (service entrance?) cable enters the building, the conduit has to be ____

A

Sealed

{225.27}

111
Q

The conductors for festoon lighting shall be supported by messenger wire in all spans exceeding ___ ft

A

40 ft

{225.6(B)}

112
Q

What is the minimum service rating for a single-family dwelling with 6 or more two-wire branch circuits?

A

100 amps

{230.79(C)}

113
Q

Circuit breakers used as switches in 120-volt fluorescent lighting shall be marked as ____

A

Most correct answer is C. A and B (HID and SWD)…only for florescent lighting

{240.83(d)}

114
Q

The width of the 120/240 volt panel working area shall be a minimum of ___ ft, and the door shall be open able to at least 90 deg.

A

2.5 ft

{110.26(a)2}

115
Q

Manhole covers shall have a minimum weight of ___

A

100 lbs

{110.73}

116
Q

A 240-volt boat hoist receptacle has to be ____

A

GFCI Protected

{210.8C)

117
Q

Non-dwelling unit receptacles installed in/on the ___ shall be GFCI protected: a. rooftops, b.outdoors, c. dedicated snow melting equipment, d.sinks?

A

Rooftops, outdoors, and sinks

118
Q

What is the minimum rating for a laundry circuit in a single family dwelling?

A

20 amps 1500watts

{210.11C2}, {220.12J, {220.52B}

119
Q

A receptacle on an individual branch circuit can be rated for what percent?

A

100%

{210.22}

120
Q

What size branch circuits shall supply only non-lighting loads?

A

larger than 50 amps

{210.24)

121
Q

What type of lamp holder shall be connected to a load in excess of 20 amps?

A

Heavy duty

{210.24)

122
Q

The laundry outlet shall be installed within how many feet of the designated applicate location?

A

6 ft

{210.45(C)}

123
Q

Receptacle outlet in the first floor shall not be counted as part of the required number of wall receptacle outlets unless located within how many inches of the wall?

A

18 inches

{210.52(a)(3)}

124
Q

Types of equipment grounding conductors?
a. rigid metal conduit
b. Listed liquid titght flexible metal conduit
c. flexible metal tubing
d. Electrical metal tubing

A

A & D: electrical metal tubing and
rigid metal conduit

125
Q

What is the cross sectional area in circular mils ofa solid wire with diameter of 0.102?

A

10,380

126
Q

A restaurant has 15.5 foot plug strip for all their television systems which are likely to be used at the same time. What is the VA?

A

2880 VA…

15.5/1, round up = 16, X 180 = 2880

{ch9 table 8…3-5 questions on ch9table8, anne c, ch9table5, ch9table4}…

127
Q

What if the TV’s are unlikely to be used at the same time, 15.5 foot plug strip.

A

720VA

unlikely: 15.5/5 = 3.1, round up to 4, x180 = 720

{ch9 table 8…3-5 questions on ch9table8, anne c, ch9table5, ch9table4}…

128
Q

An apartment has 8 water heaters at 800 watts, what is the VA?

A

4800VA

of appliances x nameplate x demand = 8x800x.75 = 4800VA

129
Q

What is the expansion rate of 500ft type RTRC that goes from 80 deg F to 50 deg F

A

2.7

Temp change = 30 deg C….54/100ft from table… (.54/100)*500=2.7

{355.44}

130
Q

240 volt to ground, 200 amp panel in condition 3 needs a minimum front clearance of ___ ft

A

4ft

{110.26(a)1}

131
Q

What is the minimum clearance in front of a service panel?

A

3 ft

{110.26(A)1}

LEARNIT (5 decks)

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