The ET practice Jouneymans test. - Page 7 - Electrician Talk - Professional Electrical Contractors Forum

Magnettica · 04-14-2009, 11:36 PM

Quote:

Originally Posted by electricista

We are talking about a dwelling so the calculated load is not continuous thus you can load the meter base to 400 amps. However, the 300 mcm are only rated for 180 amps and because of 240.4 we can use 200 amp breakers to protect them. The catch here is the load on the wire must be 180 amps or less. With 2- 200 amp panels setup like this the total connected load cannot be more than 360 amps (180 x 2).

Not sure what this has to do with the problem presented.

This was just another exam type question. I should have left a few possible answers. A control transformer has a primary amperage rating 1.5 amps. What is the size of the OCPD?

A) 3.0 amps
B) 4.5 amps
C) 7.5 amps
D) 15 amps

By the way, where are you getting 180 amps for 300 Kcmil aluminum? I'm using the 60º column for SER cable that tells me it's good for 190 amps.

(338.10 (B)(4) and 334.80)

electricista · 04-15-2009, 05:34 AM

Quote:

Originally Posted by Magnettica

By the way, where are you getting 180 amps for 300 Kcmil aluminum? I'm using the 60º column for SER cable that tells me it's good for 190 amps.

Yeah, my bad I was doing it from memory cause I was not at my home when I typed that. 190 X 2= 380.

ralpha494 · 04-23-2009, 07:20 PM

What is the load on the neutral conductor of a 480 volt delta to 120/208 volt wye transformer secondary which has 33 A on "A" phase, 12 A on "B" phase, and 17 A on "C" phase?

A. 4 amperes
B. 7 amperes
C. 12 amperes
D. 19 amperes

or this one:

How many supports are required for a two inch EMT nipple, 20 inches long, between a panel and a 12" X 12" X 6" deep box?

A. None
B. One
C. Two
D. Four Brazilian

jfwfmt · 04-23-2009, 09:51 PM

D 19Amps

Ia = 33
Ib = 12
Ic = 17
In = sqrt (Ia*Ia + Ib*Ib + Ic*Ic
-(Ia*Ib + Ib*Ic + Ic* Ia))
In = sqrt (1089 + 144 + 289)
-(396 + 561 + 204))
In = sqrt (1522 - 1161)
In = sqrt (361)
In = 19

B One

358.30(C)

/s/ Jim WIlliams

jfwfmt · 04-23-2009, 09:56 PM

Can I conceal Wiremold 500 within a wall by having it pass perpendicular to the surface of the wall?

A Yes
B No
C insufficient information

Can I conceal Wiremold 700 within a wall by having it pass parallel to the surface of the wall?

A Yes
B No
C insufficient information

/s/ Jim WIlliams

ralpha494 · 04-24-2009, 10:13 AM

I don't believe we answered Magnettica's question. I found it in 430.72 (C) (4), 500% of 1.5 is 7.5.

Here's one for after you find the answer to Jim's. (Hint: you need a thesaurus to find another word for thesaurus and wiremold.)

What is the shortest length of Sch. 40 PVC that can be installed under the ramps in an open parking structure, between two boxes, without an expansion fitting, in a state who's temperature varies between -15 degrees F and 110 degrees F?

Or your area?

Greg · 04-25-2009, 07:32 AM

deleted

Magnettica · 04-26-2009, 08:23 PM

Quote:

Originally Posted by ralpha494

I don't believe we answered Magnettica's question. I found it in 430.72 (C) (4), 500% of 1.5 is 7.5.

Here's one for after you find the answer to Jim's. (Hint: you need a thesaurus to find another word for thesaurus and wiremold.)

What is the shortest length of Sch. 40 PVC that can be installed under the ramps in an open parking structure, between two boxes, without an expansion fitting, in a state who's temperature varies between -15 degrees F and 110 degrees F?

Or your area?

That's it! I had that on my exam. I would never found that if I didn't take an exam prep course. I would have looked at Table 450.3 (B).

Magnettica · 05-01-2009, 02:02 AM

Quote:

Originally Posted by ralpha494

How many supports are required for a two inch EMT nipple, 20 inches long, between a panel and a 12" X 12" X 6" deep box?

A. None
B. One
C. Two
D. Four Brazilian

B. One

New for the 2008 NEC
358.30(C)

kkmtkevin · 05-04-2009, 09:42 PM

taking aptitude test in one week and need help on what best to study. thanks.

ralpha494 · 05-05-2009, 05:06 PM

There was a really good post on this forum in Union Topics entitled IBEW Study Manual about 5 or so pages in.

pudge565 · 05-07-2009, 09:44 AM

I took my practice NOCTI test on Tuesday. I got a 77.8 the highest of my tech class. I credit to reading the forums. Reading the posts and seeing the code references really helped me remeber things.

110431 · 05-12-2009, 04:27 PM

a transformer has 580 turns in its secondary coil and the primary coil has 145 turns on its coil and has a voltage of 120 volts what is the secondary Voltage _____

ralpha494 · 05-12-2009, 05:23 PM

Doesn't anybody want to play?

Can I conceal Wiremold 500 within a wall by having it pass perpendicular to the surface of the wall?

A Yes
B No
C insufficient information

Can I conceal Wiremold 700 within a wall by having it pass parallel to the surface of the wall?

A Yes
B No
C insufficient information

I get yes for the first question 386.10 (4)
and no for the second. 386.12 (5)

For 110431's I get (120 X 580) /145 = 480

For mine I used 352.44 and T352.44 for 125 degrees.

1/4" = 5.07/100' X length so length = (.25 X 100) / 5.07 =4.93 = 4' 11"

In an Operating Room fed by an isolation transformer, which colored wire is attached to the terminal of a 20 ampere, 120 volt receptacle labeled "white"?

A. White
B. Gray
C. Orange
D. Striped orange

Magnettica · 05-12-2009, 05:37 PM

Quote:

Originally Posted by 110431

a transformer has 580 turns in its secondary coil and the primary coil has 145 turns on its coil and has a voltage of 120 volts what is the secondary Voltage _____

Secondary - 580 turns
Primary - 145 turns

The ratio needs to found. This particular ratio is 4:1 (4 turns of 145 = 580 turns)

1 = 120 volts
4 = 480 volts

The secondary voltage here is 480 volts.

Chris Kennedy · 05-12-2009, 06:04 PM

Quote:

Originally Posted by ralpha494

In an Operating Room fed by an isolation transformer, which colored wire is attached to the terminal of a 20 ampere, 120 volt receptacle labeled "white"?

A. White
B. Gray
C. Orange
D. Striped orange

Quote:

517.160(5) Conductor Identification.
The isolated circuit conductors shall be identified as follows:
(1) Isolated Conductor No. 1 — Orange with a distinctive colored stripe other than white, green, or gray
(2) Isolated Conductor No. 2 — Brown with a distinctive colored stripe other than white, green, or gray
For 3-phase systems, the third conductor shall be identified as yellow with a distinctive colored stripe other than white, green, or gray. Where isolated circuit conductors supply 125-volt, single-phase, 15- and 20-ampere receptacles, the striped orange conductor(s) shall be connected to the terminal(s) on the receptacles that are identified in accordance with 200.10(B) for connection to the grounded circuit conductor.

..........

ralpha494 · 05-21-2009, 08:04 PM

Looks like Chris Kennedy isn't going to ask one so I'll do another. I have 104 left.

What is the minimum size equipment grounding conductor for a 15 ampere, gfci protected circuit on a pier in a yacht club?
A. 14 AWG copper
B. 12 AWG copper
C. 10 AWG copper
D. 12 AWG aluminum

Dennis Alwon · 05-21-2009, 08:09 PM

Quote:

Originally Posted by ralpha494

Looks like Chris Kennedy isn't going to ask one so I'll do another. I have 104 left.

What is the minimum size equipment grounding conductor for a 15 ampere, gfci protected circuit on a pier in a yacht club?
A. 14 AWG copper
B. 12 AWG copper
C. 10 AWG copper
D. 12 AWG aluminum

B--- 12 copper and it must be insuated 555.15(C)

Dennis Alwon · 05-21-2009, 08:12 PM

What is the smallest size grounded conductor allowed when feeding a sub panel that has a 100 amp OCPD with a calculated neutral load of 10 amps?

Chris Kennedy · 05-22-2009, 05:56 AM

Quote:

Originally Posted by Dennis Alwon

What is the smallest size grounded conductor allowed when feeding a sub panel that has a 100 amp OCPD with a calculated neutral load of 10 amps?

#8........

Quote:

215.2(A)(1)The size of the feeder circuit grounded conductor shall not be smaller than that required by 250.122, except that 250.122(F) shall not apply where grounded conductors are run in parallel.