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LEARNIT > MustNo's > Flashcards

MustNo's Flashcards

1
Q

A Restaurant has a 15.5 ft plug strip for their TV’s, which are likely to be used at the same time. What is the VA?

A

2880 VA
feet/1 (since it’s likely), then round up = 15.5/1 = 16… * 180VA = 2880VA

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2
Q

A Restaurant has a 15.5 ft plug strip for their TV’s, which are unlikely to be used at the same time. What is the VA?

A

since unlikely, use 5 as denominator, round up
feet/5 )since it’s unlikely), then round up = 15.5/5 = 4…* 180VA = 720va

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3
Q

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

A

355.44
delta T consonant * ft / 100 = rate
temp change = 30 F, rate from table = .54/100 * 500 = 2.7… look up rate in
one Q on expansion…

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4
Q

Manhole covers shall have a min weight of?

A

100 lbs
110.26A2

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5
Q

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

A

20 amp 1500 watts
210.11C2, 220.12J, 220.52B

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6
Q

18 feet of show window requires how many receptacles above window?

A

2
below 18=1, 18 or above = 2
mincode/2 + mincode = 12/2 + 12 = 18
210.62

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7
Q

A conference room is 250 sq ft and has a 12.5-foot wall. How many floor receptacles are needed?

A

1
less than 322.5ft = 1, everything else = 2…
mincode/2 + mincode= 215/2 + 215 = 322.5
210.71(b)(2)

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8
Q

Circuit breakers used as switches in 120-volt florescent lighting shall be marked as?

A

SWD and HID
(only for florescent lighting)
240.83D

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9
Q

What is the minimum height of a SE conductor rated 600volts going above a pedestrian walkway?

A

15 feet
230.24(B)

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10
Q

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

A

30 amps
240.51A

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11
Q

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

A

230.82 1-9

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12
Q

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

A

2 awg
83% rule…100-400amp……multiple by 83%… 200 * .83 = 166A…
Pg150…feeder over 100A so use 75deg copper…2.0 copper feeder = 2awg copper clad ground pg 116
2awg on table 250.66

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13
Q

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

A

4 copper

100 * .83 = 83…use 75 deg… = #4 copper
310.15(b)(7)

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14
Q

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

A

2

310.15(b)(16)
Non coincidental loads so use largest = 75A…feeder less than 100 = 60 deg column = #2 copper

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15
Q

Type NM cable shall ber approved for installing under the lowder edges of joist in crawspaces if the wire is at least _____ size

A

3x8AWG or 2x6AWG
334.15(c)

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16
Q

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

A

8 inches
314.17C

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17
Q

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

A

12 inches
314.17C

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18
Q

Light poles shall have a handhole of not less than ____

A

2” x 4”
410.30.B.1

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19
Q

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

A

422.16(B)(1)
listed for use

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20
Q

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

A

150%
430.52

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21
Q

What is the maximum surface temperature of T2A?

A

536
500.8C (masters)

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22
Q

Where do you need a tamper-proof receptacle?

A

Elementary schools

23
Q

where don’t you need a tamperproof receptacle?

A

high schools

24
Q

Car wash recept is rated for what type of location?

A

Wet location

25
Q

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

A

class I division II
514.3(b)(1)

26
Q

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

A

18 in
514.3(b)(1)

27
Q

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

A

life safety branch circuit
517.32A

28
Q

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

A

8
517.18b

29
Q

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

A

14
517.18b

30
Q

Key things to know from chapter 5 especially

A

recreational vehicles, ventilation areas

31
Q

Indoor receptacles for an electric vehicle charging station shall be mounted at a minimum height of?

A

18 inches
625.50

32
Q

Outdoor receptacles for an electric vehicle charging station shall be mounted at a minimum height of?

A

24 inches
625.50

33
Q

For photovoltaic systems, what cannot be connected to the supply side?

A

non-overcurrent light (device)

34
Q

Key things to know especially in chapter six

A

office furnishings, x-ray equipment, solar photovoltaic systems, electric vehicle charging stations, swimming pools

35
Q

Key article to know for office furnishings free standing cord and plug

A

605.9a-d

36
Q

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

A

6
Annex C table C.1A
Compact

37
Q

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

A

1 inch
table 4 and table 5…. #8 thhn = .0366 * 4 …. #10 thhn = .0211 * 6….. table 4, over two wire 40% = 1 inch
Watch out for nipples…use 60% for nipples

38
Q

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

A

10
annex C table c.2

39
Q

A ___ or ___ can pull a permit and be responsible for the work on a single-family dwelling

A

homeowner, electrical contractor
codesec

40
Q

17 feet show window require how many receptacles above window?

A

Below 18=1
210.62

40
Q

Conference room 12.5 sq ft wall, 323 sq feet, how many floor receptacles?

A

less than 322.5ft = 1, everything else = 2…
mincode/2 + mincode= 215/2 + 215 = 322.5

41
Q

Key things ch 6

A

Office furnishings, X ray equip, solar photovoltaic, ev charging, swimming pools

42
Q

Rules for feeders and services (dwellings only)

A

Take amps and multiply by 83%

Feeders:
100A or less, use 60 deg column
Over 100A use 75 deg

Service: always 75 deg

Use 90 deg only if lugs and wires are rated

43
Q

Can you run two service panels on one meter?

A

Yes, if off line side of main
-has to be underground

44
Q

Feeders to adjacent buildings

A

225.30… know this

45
Q

Power formula and ohms law for 3 phase

A

Multiply voltage by 1.73 first

46
Q

Straight pull box multiplier

A

8x

47
Q

Angled pull box multiplier

A

6x

48
Q

Voltage drop formula

A

2RAD/1000
#wires*Distance ampsOhms/1000

Ch9 table 8

49
Q

3 phase voltage drop

A

Distance #wiresampsohms.866/1000
Ch9 table 8

50
Q

Copper clad is the same as

A

Aluminum wire

51
Q

Key things motors

A

Conductor rating = 125%
Disconnect rating = 115%
Overcurrent protection = 430.52
Efficiency formula = watts/(voltsampspower factor)
746watt=1hp

52
Q

OC protection for motor

A

430.52

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