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Journeyman Electrician > JM Electrician > Flashcards

JM Electrician Flashcards

1
Q

Max Distance between straps for a straight 1” rigid conduit run is? (RMC/GRC)

A

Table 344.30 (B)(2)

12 FEET

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2
Q

NM cable is “not Permitted” in concrete.

A

334.12 (A)(9)

True

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3
Q

What is the classification for a receipt. 16”AFF in a garage?

A

511.3(A)

Unclassified

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4
Q

Define Motor Controller.

A

430.2-controller

Make and break current only

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5
Q

What is the max. Resistance of Rod and Plate Electrodes?

A

250.56

25 OHMS

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6
Q

Type UF cable “cannot” be used as a…

A

340.12(1)

Service Entrance Cable

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7
Q

Where is a disconnect prohibited?

A

230.70(A)(2)

Bathrooms

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8
Q

How deep must a 30A Type UF cable used for landscape lighting at a residence be buried?

A

Table 300.5

6 inches

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9
Q

Overhead conductor clearance for swimming pools is?

A

Table 680.8

22 1/2 feet

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10
Q

What is the min. size wire you can use for parallel feeders?

A

310.4

1/0 awg

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11
Q

Wet-Niche underwater luminare forming shells in contact w/pool water must be?

A

680.23(B)(1)

Brass or other approved corrosion resistant metal.

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12
Q

What is required for taps made on direct burial cables?

A

110.14(B) or 300.5(C)

listed means

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13
Q

The use of a ladder to access or remove without damaging the building is considered to be…..

A

100 definitions

Accessible

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14
Q

What size schedule 40 PVC is required for 5 conductors that have across sect. area of 3 1/2?

A

Chap. 9 Table 4

3 1/2 inches

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15
Q

How far must your cable be installed from the edge of a stud to be protected from damage?

A

300.4(D)

1 1/4 inches

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16
Q

How far must you strap a cable leaving a box w/ breakers and conduit seals?

A

501.15(A)(1)

18 inches

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17
Q

In walls w/ combustible material, the box must be?

A

312.3

Flush w/ the wall or project there from

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18
Q

How many switched receipts. are required in a storage area?

A

210.70(A)(3)

1

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19
Q

If there is more than one service disconnect on the same property….

A

225.33(A)
They must be grounded together.
No more than 6 disconnects

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20
Q

NM cable is permitted in a unfinished basement!

A

334.15(C)

True

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21
Q

What is the min. depth of wiring space if you are servicing 277V circuit w/ exposed live parts on both sides?

A

Table 110.26(A)(1)

4 feet

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22
Q

What receipt. rating are you allowed on a 20A circuit breaker?

A

Table 210.21(B)(3)

15 and 20 Amp recepts.

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23
Q

What is the minimum bend radius for NM cable w/a radius of 1/4”?

A

334.24
(.25x5=1.25)
1 1/4 inch
- The bending radius shall not be less than 5x the diameter of the cable.

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24
Q

How many type TW #14 wires can you put in 3/8” FMC w/ the fitting on inside of conduit?

A

348.22 / Table 348.22

2

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25
Q

Devices mounted on finished surfaces that are flammable(wood) shall be…

A

314.20

mounted flush with or project there from

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26
Q

Over current protection “shall not” be required for conductors from a battery rated less than _____ volts if the battery provides power for starting, ignition, or control of prime movers.

A

48 volts

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27
Q

Boxes at ceiling-suspended fan outlets “can not”support more than….

A

35 lbs

unless they are listed for and marked w/ the max weight to be supported.

28
Q

3 phase Y transformer?

A

0

29
Q

Elect. equipt. w/ exposed parts on one side requires a working distance of?

A

3 feet

30
Q

A JW encounters a sub-panel fed w/ type SE cable. What must he do?

A

Make sure all grounded and ungrounded conductors have insulation

31
Q

The code recognizes 2 conditions for the derating of conductors, it is the combo of these that ultimately determines the amount a conductor can be derated.

A
  1. Ambient temp.

2. # of conductors in a conduit

32
Q

Is it permitted to use steel pipe and alum. fittings and also alum. RMC w/ steel fittings where not subject to corrosive influences?

A

YES

33
Q

An NM cable is installed in an air duct, is this allowed?

A

NO!

34
Q

What is the max distance you can run #12 w/ a load of 8amps?

A

150 feet

35
Q

What size NM cable for 240V, 15,000VA?

A

4

36
Q

In a crawl space where there is no storage area or equipment, do you need to install a switch or receipt.?

A

NO!

37
Q

The reason for parallel feeders is to?

A

Reduce inductive heat

38
Q

Why must there be ventilation in a room where you store batteries?

A

To prevent an explosive air/gas mixture

39
Q

Which method is approved for the bonding of a clothes dryer?

A

None of the above

40
Q

When there is more than 1 ground rod, how far must the second be placed?

A

6 feet

41
Q

What is the max. number of switches that may be used as the disconnecting means for a feeder?

A

6

42
Q

Service mast as supports must be…

A

225.17 or 230.28

ADEQUATE STRENGTH or be supported by braces or guys to safely withstand the strain imposed on it.

43
Q

Parallel feeders must have…

A 
310.4
(1-5)
Must be terminated in the same manner/
Same size/
Same Material/
Insulation type/
Length
44
Q

The min. headroom required for switchboards is?

A

110.26(E)

6 1/2 feet

45
Q

Are GFI receipts. required in bathrooms and attached garages?

A

210.8(A)(1-8)
YES
Bathrooms, Garages, outdoors, crawlspaces, unfinished basements, kitchen, boathouse, laundry/ utility/ wet bar

46
Q

Why must you install conduit in a continuous manner?

A

300.10

Far a safe continuity path back to the service.

47
Q

Electrical Signs are to be…

A

600.3

LISTED! and installed in conformance w/ that listing, unless otherwise approved by special permission

48
Q

How far must you strap NM cable from an NM box?

A

334.30

12 inches

49
Q

What does the interrupting rating of a circuit breaker protect?

A

100 definitions

Max current/amps of conductor

50
Q

The two main safety concerns in a hospital in a power outage are…

A

517.33

Illumination and telephone Equipt. rm

51
Q

What is the min. ampacity for a 3 phase, 23v, 15hp inductive type motor?

A

Table 430.250

42 Amps

52
Q

What circuit must operate in the “life safety” branch of health facilities?

A

Automatically operated doors used for building egress

53
Q

How many 20 amp lighting circuits are required for a 3000 sqft residence?

A

5

54
Q

What is the min. length of cord on kitchen waste disposal?

A

18 inches

55
Q

Objectionable current flow…

A

Installed at different location

56
Q

What is the inverse time circuit breaker required for a motor rated for 20a?

A

20x250%=50A

57
Q

What is the classification for a garage w/out vents where flammable material is stored?

A

Class 1, Div.2

58
Q

“Sample” A metal box w/clamps is to contain 2- 14/2 NMC w/GRD, 1- 14/3 NMC w/GRD and one receipt. what is the min. size box(in cu. in.) permitted?

A 
314.16 (B)(1.5)
7#14@2.0 cu.in.=   14 cu.in
1-clamp(#14)=          2 cu.in
2-strap(#14)=            4 cu.in
1-ground(#14)=         2 cu.in
                                22 cu.in
59
Q

“SAMPLE” A conduit has 3 #12 thru the riffing; 2-#12 that enter and splice in the fitting; 2-#12 that leave the fitting.
What is the min. cubic inch capacity that the manufacture must have marked on the fitting?

A 
314.16(C)(2) / 314.16(B)(1) table
#12= 2.25 cu.in
*a conductor which passes thru counts as 1.
3-#12- 3x2.25=6.75
4-#12- 4x2.55=9
 6.75+9=15.75 cu.in
15.75 cu.in
60
Q

“SAMPLE” What is the ampacity of 4 - 4/0 THHN copper conductors in a raceway installed thru an smb. temp. of 40*C

A 
Table 310.15(B)(2)(a)
4-6 conductors 80%
4/0    230A     230x.80=184A
82% derate for 45*C
184Ax.82=150.88
150.88A
61
Q
  1. Abandoned Cond. & cords
A

NO unless approved

62
Q
  1. Smoke detectors
A

SHALL NOT

63
Q
  1. Show windows
A

18” within

64
Q
  1. Service disconnect
A

Inside and out of building

65
Q
  1. Clark County New
A

Concrete Encased

Journeyman Electrician (1 decks)

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