My jw test is coming up soon, I need help studying. So give me all you got.

Here's one from a quiz I give my students. BTW ... it's a trick question:

The service drop attaches to the house above the second story window and the meter is 5' from the ground. You only have 9" between the window and the corner of the building. Is this sufficient clearance to run the SEC down to the meter? If not, how much do I need?

What is longer, a stick of 1/2" EMT or a strick of 1" Gal?

When can a white conductor be used as a hot conductor and if done how must it be identified? Code article please.

Steve,

Does the window open or is it plate glass that stays shut?

Does a cross-eyed dyslexic read normally?

?yllamron daer cixelsyd deye-ssorc a seoD

Why does it hurt when I....

Never mind.

200.7 (c)(3) reidentified as white. on the supply side of the switch.

sorry
I meant to indicate it use. not white.

Bucketman, welcome to the forum. Have you seen this thread yet?
https://www.electrical-contractor.net/ubb/Forum2/HTML/001846.html

You can also take an exam here.
http://www.mikeholt.com/examprep.php?id=exampreponlinejourneyman

Good luck.

Roger

ya I looked at that. it's really great.
1/2 emt and 1" gal come both in ten foot sticks.

LOL,
nayR!

[This message has been edited by Trumpy (edited 01-08-2005).]

Here's one:
You have 118 feet of two inch rigid between the panel and the box. What is the minimum number of straps required to support it?

I think the pipe question got ya tho.
EMT is ten feet without the coupling rigid is ten feet with the coupling, making them 9'11".

Hey bucket, I have found most of the folks on this forum to be pretty durn good people and very helpful. So I hope some of the posts on your thread don't take you back.

( I think they get more friendly as you get further and further from the East Coast. )

Your answer to my question is not correct.
Should be 200.7 (C)(2)

I have been looking around for that for a couple days though. Thanks for doing my home work!

What is the maximum number of conductors one may place inside EMT Conduit?

Please give number of conductors, size of conductors, size of EMT, and OCPD size assuming non-continuous loads.

Hint: This Calculator may help...

OUCH!!


Bill

Bill I concur!!! double ouch!!!

Sun Tzu wrote in the 'Art of War', about 2300 years ago - do not under estimate your enemy. I say do not under estimate your friends, including us Easterners !!!

Pierre

"What is the maximum number of conductors one may place inside EMT Conduit?"

singl or three phase?

1" emt @ (24")
#12 awg
20 amp ocp
# of thhn conductore are 26

1"emt @ (25")
#12 awg
20 amp ocp
# of thhn @ 75c conductore are 6+ground unbalanced

-single phase 9+gound balanced
-three phase 8+gound balanced

What 3 IBEW locals make the most money per hour?

Does this comply? State NEC refferance.

2 Bx off-sets, 3 - 90's, 2 - 45's on the same run of conduit.

Local3Jr, are you going to give us an A,B,C,D, choice?

Welcome to the forum, but Union or Nonunion affiliation is a blind issue here.

Roger

Local3Jr,

I agree with Roger, leave that out of this....

{Sentence removed by Webmaster}
Dnkldorf: Let's not stir anything here.

[This message has been edited by Webmaster (edited 01-09-2005).]

Dnk,

Someone is not a word. I think you meant to say some one.

Local3Jr,

In case you don't know, We're a mixed group here, we don't talk about affiliations. We focus on the Codes and doing the job better and safer.

With that said, Welcome to ECN.


Bill

State NEC ?

the national electrical code 344.26
not more then 360 between pull points.

Yep, Box off-sets count too!

You have no idea how many times I say that to people that have been at this for years.

And I'll take a stap at Local3jr's Q?

Chicago, SF, and NYC. If not LA.

Yes, let's say three-phase...

(Oops-forgot that little important issue)

Hmmm...

I get 161 #8's in a 4" EMT non-cont rated will net me 17.5A and a 20A Breaker.

Correct?

711- 14 AWG type Z conductors in a 4 in EMT conduit, as per Table C1 - page 646 NEC 2002.
Using a 6 amp fuse as per 240.6(A) - This is feeding many motors .
Pierre

[This message has been edited by PCBelarge (edited 01-09-2005).]

In a 2 story dwelling do you need smokes down stairs even if there is no hallway?

In a basement you have 2 exits does code require lights to be on 3, ways

If you have an ISO ground bus in a sub panel can you take this wire and bond it directly to the cold water pipe?

When wiring an Elevator when and why do you a Shunt Trip Breaker?

3 phase 480v A/C unit has a 600V disconnect slow blow fuses does the breaker still need to be HVAC rated?


How many breakers are allowed in an out building sub panel before you need a main disconnect on that sub panel.

The foreman tells you; above the ceiling is a conditioned space. Does this mean you have to use compression fittings? What about phone and data cable, fire, class 2 wires? Does it need to be in EMT?

Dnkldorf: makes no difference

Who first asked Doug W's question:
"Why does it hurt when I ....."?
(answer = Zappa)


Can a #2 conductor be installed in parallel with another #2 conductor? If so, under what circumstances? If not, why?

#1 You go on a service call for fixtures not working on outside light poles for a car lot. The problem is a bad time clock feeding a contactor so you replace it. While you were investigating the problem you see these poles are fed with (9) 20 amp circuits from a 120/208 v service .

Now you find that all these circuits share (1) #6 THHN neutral, is this legal?

Yes
No

#2 In a dwelling unit you can install _______ receptacles on a 15 amp circuit.

A 10
B 13
C As many as you can carry in a wheelbarrow
D There is no limit

#3 Which of the following statements about the Grounding Electrode Conductor
(GEC) is false?

A It must be green or marked green
B It must be sized per article 250.66
C It can be orange
D It can be copper, aluminum, or copper clad aluminum

#4 Before the 2002 code gray could be used for an ungrounded (hot) conductor.

True
False

#5 The smallest wire that is allowed to be run in parallel per the NEC is

A 1/0
B #1
C #20
D 500 MCM

I will post the answers later.


Roger

bucketman,

Here's a hypothetical reasoning problem:
(nothing to do with code)

If you have a Light in the Attic and 3 switches in the Basement (1 turns on that light) - How can you fgure out, by yourself, which switch it is and only make the trip up to the Attic 1 time?

Everything works, the Attic is not within sight and no one else is there.

If anyone else has heard the answer to this before please do not let it out right away.


Bill

Great questions Roger.

Thank you Ryan. I like Bill's question too.

oot sruoy ekil I ,WTB

Roger


[This message has been edited by Roger (edited 01-10-2005).]

Roger
I will take a stab at your dubious questions

1. No - 9 x .0133 = .1197 Which equates to a 2/0 Phase conductor. 250.66 2/0 - 4AWG neutral
2. D
3. A
4. True
5. C - 620.12(A)(1)

Pierre

Hello Pierre, I will post the answers tommorow evening.

Roger

I'll give it a shot Roger

#1 Yes
#2 D
#3 C
#4 False
#5 B

Oh the suspense

Okay I'll wait,

Pierre

Q: "In a 2 story dwelling do you need smokes down stairs even if there is no hallway"

A: one on every level.

Is this in the NEC?

Q: "In a basement you have 2 exits does code require lights to be on 3, ways"

A: On the exterior entrance and exits lights
at each man door with their own wall
switchs or motion.

A: On the interior only on the stairways with six risers or more and landing level with entry shall REQUIER threeway.

I'll take a shot Roger
1.No #2 220.22
2.A
3.C
4.True
5.1/0 Feeders #20 Lighting fixture wires

Q: When wiring an Elevator when and why do you a Shunt Trip Breaker?

A: when their is an application of water via sprinklers in pit or machine room and the like.


But thats a gess i didn't really find much.

Q: "How many breakers are allowed in an out building sub panel before you need a main disconnect on that sub panel."

A: A little tricky their dave. if its a seperate building you need a main no mater how meny breakers.

Bucket: Try the "how many breakers" question one more time. Are you in article 225?

What is the minimum size conductor needed to connect the secondary of a transformer to a panel with a 400 amp main breaker.

Bucketman
How about an answer. 01/12/05

[This message has been edited by Bob (edited 01-11-2005).]

[This message has been edited by Bob (edited 01-12-2005).]

Here's an easy one for Bucketman:

Which NEC Section/Article states the correct Ground-Pin orientation of a Receptacle?

... Just kidding!!

Here is the real Q:

Which of these Seperately Derived Systems (SDS) may use the OCPD on the Primary side to protect the Secondary side feeders - and why? :

<OL TYPE=A>

[*] 480 VAC Pri. x 120 VAC Sec. 1 Phase 2 Wire,

[*] 240 VAC Pri. X 600 VAC Sec. 1 Phase 2 Wire,

[*] 600 VAC Pri. X 120/240 VAC Sec. 1 Phase 3 Wire,

[*] 480 VAC Pri. X 208Y/120 VAC Sec. 3 Phase 4 Wire,

[*] 240 VAC Pri. X 600 VAC Sec. 3 Phase 3 Wire,

[*] 600 VAC Pri. X 120/240 VAC Sec. 3 Phase 4 Wire.
</OL>

All Transformers are Isolated types (Primary-Secondary windings Isolated), and are sizes between 37.5 and 45 KVA.

***NOTE***

*VAC = Volts, Alternating Current,
* Pri. = Primary,
* Sec. = Secondary.

This one is a piece of cake!

Scott35

1. What does "BIL" mean?

2. Where can I find a balustrade?

3. When are starwashers permitted to be used?

1) Basic insulation level

2) On a stairway or balcony

3) When Orion's Belt gets dirty

Here are the answers to my questions from yesterday with the questions reposted.

#1 You go on a service call for fixtures not working on outside light poles for a car lot. The problem is a bad time clock feeding a contactor so you replace it. While you were investigating the problem you see these poles are fed with (9) 20 amp circuits from a 120/208 v service .
Now you find that all these circuits share (1) #6 THHN neutral, is this legal?

Yes
No

#2 In a dwelling unit you can install _______ receptacles on a 15 amp circuit.

A 10
B 13
C As many as you can carry in a wheelbarrow
D There is no limit

#3 Which of the following statements about the Grounding Electrode Conductor
(GEC) is false?

A It must be green or marked green
B It must be sized per article 250.66
C It can be orange
D It can be copper, aluminum, or copper clad aluminum

#4 Before the 2002 code gray could be used for an ungrounded (hot) conductor.

True
False

#5 The smallest wire that is allowed to be run in parallel per the NEC is

A 1/0
B #1
C #20
D 500 MCM


Answers ;

#1 Yes, see 225.7(B)

#2 D, 220.3(B)(10) although there is a minimum number of circuits to serve the square footage and the required circuits per article 210, there is no limit to the number of receptacles that can be on each
circuit.

#3 A, see 250.62 note there is no color required and in fact it can be any color except “white or gray” see 200.7 (A)

#4 True, see that the NEC recognizes this in the FPN under 200.10(D)

#5 C, see 620.12(A)(1)



(edited to correct spacing)

Roger



[This message has been edited by Roger (edited 01-11-2005).]

6-6-98
Somebody asked the question about the three switches in the basement and the light bulb in the attic.
Here is the answer: RAY: You turn the first switch on. You leave it on for ten minutes. Why, you ask? You'll see in a minute. Then you turn it off and you turn the second switch on and you go upstairs.

This is an old puzzler from CarTalk.com with Tom and Ray, the tappit brothers. Look under puzzler and archives. These are pretty good.
~Peter

Thats a good one, anyone else have anymore like that?

Q:"What is the minimum size conductor needed to connect the secondary of a transformer to a panel with a 400 amp main breaker."

A:600 kcmil thhn @75c is good for 420amp.
But two paralleled 3/0 is good for 400amp.

i'm i missing something?

Bucketman
You did no miss a thing. You are right on.
The reason I asked this question was because there was some confusion on another forum regarding 240.3B and transformer secondary.
Some felt that 500 kcm was the minimum size.
However 240.20C requires the ampacity of the conductor to match the OC device.

[This message has been edited by Bob (edited 01-16-2005).]

Q:"Which of these Seperately Derived Systems (SDS) may use the OCPD on the Primary side to protect the Secondary side feeders - and why?"

A: (A)
240.(C)(1) & 450.3 (B)

Q:"Which of these Seperately Derived Systems (SDS) may use the OCPD on the Primary side to protect the Secondary side feeders - and why?"


I was thinking "A", "B" and "E" would qualify, as they all have a "Single" Secondary Output Voltage", whereas "C", "D" and "F" would nt qualify, as they have Multiwire Secondaries.

Scott35

Since you're still going at it.

Someone asked me: "where in the NEC does it say I must use MC to hardwire a disposal"?

Q:" Someone asked me: "where in the NEC does it say I must use MC to hardwire a disposal"?

A: 422.16 (B)(1)
this is the only specific this I found on disposals
you should also be able to use flex.

Well I'm 3000 miles from the east coast, but in an easterly direction. Not sure whether that makes me very friendly or a real grouch!

Which begs the question: What is the difference between gray and natural gray?

Naw, Pauluk it just means your even further West than I am. Hey, only kidding around about the regional "Nice Guy" thing. Just a friendly poke.

I passed thanks for all the help.

congratulations!

Congratulations indeed!

And I will follow suit. Congratulations!

Roger

what UL listing are can lights?