Cable Tray

[new_ee]

Can you run current carrying conductors in a cable tray without them being in a conduit? Could you quote the article to back it up? I believe you can but I'm having a disagreement with a friend.

 

[petersonra]

Re: Cable Tray

why would you put them in conduit at all if in a cable tray?

you would be better off just running conduit.

 

[new_ee]

Re: Cable Tray

Originally posted by petersonra:
why would you put them in conduit at all if in a cable tray?

that's exactly what i was thinking. why use both? this is for a industrial plant with many current carrying conductors for equipment. i dont think we'd want to use conduit here.

 

[jim dungar]

Re: Cable Tray

Are you talking about circuit size (i.e. #12) or larger (i.e. #1/0) conductors? See 392.3(B)(1).

 

[ed downey]

Re: Cable Tray

The Answer To Your Question Is Yes. See Article 392 In 2002 NEC Or Article 318 In 1999 NEC.

Also Verify That The Cable Tray Or If It Is Wire Basket Tray That It Is Rated For 600V Conductors.

I Know Cablofil Makes A Wire Basket Designed For Industrial Applications.
www.cablofil.com
-Ed

 

[new_ee]

Re: Cable Tray

Some of the conductors are larger some smaller. I guess after reading 392 again my question is really do I have to use a certain type of conductor in a cable tray? I can't just run THHN in there?

 

[steve66]

Re: Cable Tray

Per 392.3, single conductors have to be 1/0 or larger and listed for use in a cable tray, and can only be installed in cable trays in industrial establishments...conditions of maintenance...ect.

If you are thinking #12 wires for power and control, there should be multiconductor cables listed for use in cable trays.

I would expect some exception for a totally enclosed cable tray, but I don't see one.

Steve

 

[petersonra]

Re: Cable Tray

Originally posted by steve66:


I would expect some exception for a totally enclosed cable tray, but I don't see one.

Steve

a totally enclosed cable tray is called wireway, and you can put smaller single conductor cables in it.

[ July 15, 2005, 12:41 PM: Message edited by: petersonra ]

 

[don_resqcapt19]

Re: Cable Tray

Bob,

a totally enclosed cable tray is called wireway, and you can put smaller single conductor cables in it.

I don't agree. A wireway and totally enclosed cable tray are not the same product.
Don

 

[petersonra]

Re: Cable Tray

Originally posted by don_resqcapt19:
Bob,

a totally enclosed cable tray is called wireway, and you can put smaller single conductor cables in it.

I don't agree. A wireway and totally enclosed cable tray are not the same product.
Don

I don't think I have ever seen a totally enclosed cable tray. Every one I have ever seen is either a ladder style or is ventilated.

 

[don_resqcapt19]

Re: Cable Tray

Solid bottom tray with a solid top. Not common, but it does exist.
Don