Trough Fill

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tacomafc

tacomafc

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Long Island New York
I Need some help with derating. I have a 10 foot X 10 inch trough mounted over 3 200 amp sub-panels I'm going to use two 18 inch pipes from each panel to the trough. The pipe is 2 inch emt. Most of the wire will be 14/2 romex. Could you please let me know if this could be done without going up to a 12/2 romex on a 15 amp breaker. Thank You for your time
-Frank
 
Re: Trough Fill

-Frank,

What I can interpret in your post:
310.15(b)(2)
-The "18 nipples,not being your problem-.


The problem as I interpret being:
366.22(a)- is exceeding 30 current carrying conductors-.The 20% fill may or may-not be a factor,given the fact of you have not denoted in your post,in the knowing exactly what all is in the trough..


:Depending on the way your conductors,are laid out entering this enclosure above the three (3) panels,can you install dividers (end caps internal inside enclosure), to section-out the areas of this trough above the panels.In reducing the #'bers of conductors as a whole, to the given (sectioned) areas.Provided,your not exceeding the 20% fill and 30 currect carrying conductor limitation, of the sectioned areas?

In reading your post,I suspect this installation,in fact already exsist.And not knowing how many current-carrying conductors,are passing through this enclosure,to the denoted (3)200 ampere panels..(have you got more than thirty current carrying conductors,to EACH panel)

Noted: I'm sure in my response to this thread,will raise up some comments..Trying to think off-the-fly...More than likely, non- workable solution in this situation...

[ May 05, 2005, 10:19 AM: Message edited by: dillon3c ]
 
Re: Trough Fill

The only conductors in the trough will be branch circuits for a residential dwelling. The feeders come from below. There will be mostly 15 amp circuits with some small appliance branch circuits and some larger appliances. The reason for the trough is so the electric room looks very neat and clean. I hate when there is a birds nest in the rafters over the panels. All the wire will drop strait in the trough and then go in to the correct panel. As for the amount of conductors I think we should assume that the three 200 amp 42 circuit panels will be maxed out. So that should be 252 current carrying cunductors.
 
Re: Trough Fill

Originally posted by tacomafc:
As for the amount of conductors I think we should assume that the three 200 amp 42 circuit panels will be maxed out.
Click to expand...
Assume,well detail might have been lacking,in first post.You never gave referance of count of current carrying conductors.

I'm assuming you have a current copy of the NEC too,but I would be just -assuming-.

good luck to you sir..
 
Re: Trough Fill

Hey Guy, This is a new 20,000 sq ft house. The three panels currently have zero circuits pulled to them. I was assuming that they will be maxed out ok. I think you have to chill out a little bit.
 
Re: Trough Fill

Oh ya but I dont know about you GUY but I just compleated a 10 hour seminar on the 2005 code at the ibew local 25 hall. So lets not talk about "THE NEW CODE"
 
Re: Trough Fill

I don't what the "new code" has to with this...376.22 is the same in the '05 and '02 NEC...maybe you are under the '99?
(which basically says the same thing in 374-5 and 374-6)

376.22 will direct you to 310.15(B)(2)(a), because of the fill design (252 current carring conductors)...derated to 35%.
Your #14's + #12's will probably need to be bumped up substainially(could be as large as a #6 or #4)....which may also increase the number of nipples exiting each panel.


************
A 10 hour code UPDATE is not the same as actually taking a licensing course and/or having a contractor's license - regardless of who gave the update course in Long Island. I also just completed a 10 hour at a union hall - and conductor fill in a trough was never discussed as it is not "new".
 
Re: Trough Fill

Originally posted by tacomafc:
Sure I know that I was just replying to the other guys comment
Click to expand...
So what is your question? (because I don't know what you mean by "I know that")
 
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