JM Electrician

Question 1

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

Answer 1

Table 344.30 (B)(2)

12 FEET

Question 2

NM cable is “not Permitted” in concrete.

Answer 2

334.12 (A)(9)

True

Question 3

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

Answer 3

511.3(A)

Unclassified

Question 4

Define Motor Controller.

Answer 4

430.2-controller

Make and break current only

Question 5

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

Answer 5

250.56

25 OHMS

Question 6

Type UF cable “cannot” be used as a…

Answer 6

340.12(1)

Service Entrance Cable

Question 7

Where is a disconnect prohibited?

Answer 7

230.70(A)(2)

Bathrooms

Question 8

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

Answer 8

Table 300.5

6 inches

Question 9

Overhead conductor clearance for swimming pools is?

Answer 9

Table 680.8

22 1/2 feet

Question 10

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

Answer 10

310.4

1/0 awg

Question 11

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

Answer 11

680.23(B)(1)

Brass or other approved corrosion resistant metal.

Question 12

What is required for taps made on direct burial cables?

Answer 12

110.14(B) or 300.5(C)

listed means

Question 13

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

Answer 13

100 definitions

Accessible

Question 14

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

Answer 14

Chap. 9 Table 4

3 1/2 inches

Question 15

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

Answer 15

300.4(D)

1 1/4 inches

Question 16

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

Answer 16

501.15(A)(1)

18 inches

Question 17

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

Answer 17

312.3

Flush w/ the wall or project there from

Question 18

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

Answer 18

210.70(A)(3)

1

Question 19

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

Answer 19

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

Question 20

NM cable is permitted in a unfinished basement!

Answer 20

334.15(C)

True

Question 21

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

Answer 21

Table 110.26(A)(1)

4 feet

Question 22

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

Answer 22

Table 210.21(B)(3)

15 and 20 Amp recepts.

Question 23

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

Answer 23

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

Question 24

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

Answer 24

348.22 / Table 348.22

2

Question 25

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

Answer 25

314.20 | mounted flush with or project there from

Question 26

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.

Answer 26

48 volts

Question 27

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

Answer 27

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

Question 28

3 phase Y transformer?

Answer 28

0

Question 29

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

Answer 29

3 feet

Question 30

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

Answer 30

Make sure all grounded and ungrounded conductors have insulation

Question 31

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.

Answer 31

1. Ambient temp. | 2. # of conductors in a conduit

Question 32

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

Answer 32

YES

Question 33

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

Answer 33

NO!

Question 34

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

Answer 34

150 feet

Question 35

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

Answer 35

#4

Question 36

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

Answer 36

NO!

Question 37

The reason for parallel feeders is to?

Answer 37

Reduce inductive heat

Question 38

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

Answer 38

To prevent an explosive air/gas mixture

Question 39

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

Answer 39

None of the above

Question 40

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

Answer 40

6 feet

Question 41

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

Answer 41

6

Question 42

Service mast as supports must be...

Answer 42

225.17 or 230.28 | ADEQUATE STRENGTH or be supported by braces or guys to safely withstand the strain imposed on it.

Question 43

Parallel feeders must have...

Answer 43

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

Question 44

The min. headroom required for switchboards is?

Answer 44

110.26(E) | 6 1/2 feet

Question 45

Are GFI receipts. required in bathrooms and attached garages?

Answer 45

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

Question 46

Why must you install conduit in a continuous manner?

Answer 46

300.10 | Far a safe continuity path back to the service.

Question 47

Electrical Signs are to be...

Answer 47

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

Question 48

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

Answer 48

334.30 | 12 inches

Question 49

What does the interrupting rating of a circuit breaker protect?

Answer 49

100 definitions | Max current/amps of conductor

Question 50

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

Answer 50

517.33 | Illumination and telephone Equipt. rm

Question 51

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

Answer 51

Table 430.250 | 42 Amps

Question 52

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

Answer 52

Automatically operated doors used for building egress

Question 53

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

Answer 53

5

Question 54

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

Answer 54

18 inches

Question 55

Objectionable current flow...

Answer 55

Installed at different location

Question 56

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

Answer 56

20x250%=50A

Question 57

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

Answer 57

Class 1, Div.2

Question 58

“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?

Answer 58

``` 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 ```

Question 59

“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?

Answer 59

``` 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 ```

Question 60

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

Answer 60

``` 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 ```

Question 61

1. Abandoned Cond. & cords

Answer 61

NO unless approved

Question 62

2. Smoke detectors

Answer 62

SHALL NOT

Question 63

3. Show windows

Answer 63

18” within

Question 64

4. Service disconnect

Answer 64

Inside and out of building

Question 65

5. Clark County New

Answer 65

Concrete Encased