MustNo's

Question 1

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?

Answer 1

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

Question 2

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?

Answer 2

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

Question 3

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

Answer 3

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…

Question 4

Manhole covers shall have a min weight of?

Answer 4

100 lbs
110.26A2

Question 5

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

Answer 5

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

Question 6

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

Answer 6

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

Question 7

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

Answer 7

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

Question 8

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

Answer 8

SWD and HID
(only for florescent lighting)
240.83D

Question 9

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

Answer 9

15 feet
230.24(B)

Question 10

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

Answer 10

30 amps
240.51A

Question 11

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

Answer 11

230.82 1-9

Question 12

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

Answer 12

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

Question 13

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

Answer 13

4 copper

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

Question 14

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?

Answer 14

2

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

Question 15

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

Answer 15

3x8AWG or 2x6AWG
334.15(c)

Question 16

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

Answer 16

8 inches
314.17C

Question 17

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

Answer 17

12 inches
314.17C

Question 18

Light poles shall have a handhole of not less than ____

Answer 18

2” x 4”
410.30.B.1

Question 19

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

Answer 19

422.16(B)(1)
listed for use

Question 20

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

Answer 20

150%
430.52

Question 21

What is the maximum surface temperature of T2A?

Answer 21

536
500.8C (masters)

Question 22

Where do you need a tamper-proof receptacle?

Answer 22

Elementary schools

Question 23

where don’t you need a tamperproof receptacle?

Answer 23

high schools

Question 24

Car wash recept is rated for what type of location?

Answer 24

Wet location

Question 25

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

Answer 25

class I division II 514.3(b)(1)

Question 26

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

Answer 26

18 in 514.3(b)(1)

Question 27

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

Answer 27

life safety branch circuit 517.32A

Question 28

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

Answer 28

8 517.18b

Question 29

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

Answer 29

14 517.18b

Question 30

Key things to know from chapter 5 especially

Answer 30

recreational vehicles, ventilation areas

Question 31

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

Answer 31

18 inches 625.50

Question 32

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

Answer 32

24 inches 625.50

Question 33

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

Answer 33

non-overcurrent light (device)

Question 34

Key things to know especially in chapter six

Answer 34

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

Question 35

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

Answer 35

605.9a-d

Question 36

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

Answer 36

6 Annex C table C.1A Compact

Question 37

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

Answer 37

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

Question 38

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

Answer 38

10 annex C table c.2

Question 39

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

Answer 39

homeowner, electrical contractor codesec

Question 40

17 feet show window require how many receptacles above window?

Answer 40

Below 18=1 210.62

Question 40

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

Answer 40

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

Question 41

Key things ch 6

Answer 41

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

Question 42

Rules for feeders and services (dwellings only)

Answer 42

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

Question 43

Can you run two service panels on one meter?

Answer 43

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

Question 44

Feeders to adjacent buildings

Answer 44

225.30… know this

Question 45

Power formula and ohms law for 3 phase

Answer 45

Multiply voltage by 1.73 first

Question 46

Straight pull box multiplier

Answer 46

8x

Question 47

Angled pull box multiplier

Answer 47

6x

Question 48

Voltage drop formula

Answer 48

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

Question 49

3 phase voltage drop

Answer 49

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

Question 50

Copper clad is the same as

Answer 50

Aluminum wire

Question 51

Key things motors

Answer 51

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

Question 52

OC protection for motor

Answer 52

430.52