MustNo's Flashcards by steve mac

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?

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

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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?

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

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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Manhole covers shall have a min weight of?

100 lbs
110.26A2

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

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

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

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

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

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

SWD and HID
(only for florescent lighting)
240.83D

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

15 feet
230.24(B)

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

30 amps
240.51A

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

230.82 1-9

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

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

4 copper

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

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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?

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

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

3x8AWG or 2x6AWG
334.15(c)

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

8 inches
314.17C

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

12 inches
314.17C

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Light poles shall have a handhole of not less than ____

2” x 4”
410.30.B.1

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

422.16(B)(1)
listed for use

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

150%
430.52

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What is the maximum surface temperature of T2A?

536
500.8C (masters)

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Where do you need a tamper-proof receptacle?

Elementary schools

where don’t you need a tamperproof receptacle?

high schools

Car wash recept is rated for what type of location?

Wet location

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

class I division II 514.3(b)(1)

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

18 in 514.3(b)(1)

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

life safety branch circuit 517.32A

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

8 517.18b

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

14 517.18b

Key things to know from chapter 5 especially

recreational vehicles, ventilation areas

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

18 inches 625.50

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

24 inches 625.50

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

non-overcurrent light (device)

Key things to know especially in chapter six

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

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

605.9a-d

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

6 Annex C table C.1A Compact

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

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

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

10 annex C table c.2

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

homeowner, electrical contractor codesec

17 feet show window require how many receptacles above window?

Below 18=1 210.62

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

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

Key things ch 6

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

Rules for feeders and services (dwellings only)

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

Can you run two service panels on one meter?

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

Feeders to adjacent buildings

225.30… know this

Power formula and ohms law for 3 phase

Multiply voltage by 1.73 first

Straight pull box multiplier

Angled pull box multiplier

Voltage drop formula

2RAD/1000 #wires*Distance *amps*Ohms/1000 Ch9 table 8

3 phase voltage drop

Distance *#wires*amps*ohms*.866/1000 Ch9 table 8

Copper clad is the same as

Aluminum wire

Key things motors

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

OC protection for motor

430.52