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No lb's please! #112535
07/07/01 10:51 PM
07/07/01 10:51 PM
Admin  Offline
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Posts: 3,545
NY, USA
[img]https://www.electrical-contractor.net/Violations/Submissions/nolb's.jpg[/img]
Quote
There is nothing wrong here, I hope. I thought that the wireway would look better than 20 LB's. Also, it turned out to be a lot easier to install since I didn't have to be real meticulous about the hole location in the sheeting. Largest raceway is 1" & the largest conductor is #6thhn.

Tom

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Re: No lb's please! #112536
07/08/01 08:37 AM
07/08/01 08:37 AM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,280
Fullerton, CA USA
Looks like there might be a violation of the 30 conductor in a cross-section rule? (I don't have my book today).

Re: No lb's please! #112537
07/08/01 09:00 AM
07/08/01 09:00 AM
S
sparky  Offline
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Joined: Oct 2000
Posts: 5,372
electure;
very interesting observation, 362-5. does "any cross section" imply the total # of wires in the troffer, or simply those that would cross each other , i.e.-i can hold 30 with one hand?

I do not understand the main rule as applied to the EX, and the derating. do it, don't do it???

Re: No lb's please! #112538
07/08/01 02:09 PM
07/08/01 02:09 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
The "cross section" would be the 4"x4" dimension & would not include the 5' dimension, otherwise, that would be a leangthwise section. Confused? See the second paragraph of 362-5 where it speaks about the cross sectional area of conductors, nothing is said about measuring their areas leangthwise.

If the conductors did a bunch of cross overs, then you could derate them, use as many as you want provided you don't fill up any cross section more than 20%. Derating penalty would be a killer though.

This installation prompted a question that I never received a good answer to. This is labeled as a wireway & I have to use the rules of a wireway. If I had a custom made junction box, I would be able to fit in 426 #12's & no derating. ((4x4x60")/2.25=462)
Is there any differance, other than technical definitions?


Few things are harder to put up with than the annoyance of a good example.
Re: No lb's please! #112539
07/08/01 03:03 PM
07/08/01 03:03 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,372
that's it!, i'm going to hide under my bed.....hold my calls......

Re: No lb's please! #112540
07/08/01 06:08 PM
07/08/01 06:08 PM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,280
Fullerton, CA USA
Your question would have to be answered by having a NRTL sign your 4-4-60 off as a j/b.
I routinely see this section of the code violated, & any reference to this section usually brings a "Huh?" from the one installing the wireway.

Re: No lb's please! #112541
07/09/01 06:12 PM
07/09/01 06:12 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
As far as I know, the only listing requirement for boxes applies to damp & wet locations. If you need to make a custom size box, all you have to do is meet 370-40. I've seen plenty of custom made boxes over the years & there isn't a thing wrong with them. The key , of course, is the box acceptable to the AHJ?


Of course, I've seen a few wireways that you couldn't get the covers on because of the wire inside. Sawmills around here are notorious for this.

Tom

[This message has been edited by Tom (edited 07-09-2001).]


Few things are harder to put up with than the annoyance of a good example.
Re: No lb's please! #112542
07/09/01 06:15 PM
07/09/01 06:15 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
A

[This message has been edited by Tom (edited 07-09-2001).]


Few things are harder to put up with than the annoyance of a good example.

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