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#83423 - 01/30/03 01:06 PM Cable Tray
mountainman Offline

Registered: 01/29/02
Posts: 54
Loc: Richmond Va. U.S.A.
I am refering to the 1996 NEC Handbook, on page 255 article 318-11 the book has a diagram 318-3 shows a one cable distance between each cable. I cannot find a code reference that says you shall maintain one cable width between each cable. What I have is MC cable with 4 5ookcmil conductors. Is there a mandatory spacing requirement, and if so what is the code reference. Thanks Joe

2014 / 2011 NEC & Related Books and Study Guides
#83424 - 01/30/03 01:55 PM Re: Cable Tray
txsparky Offline

Registered: 05/25/01
Posts: 578
Loc: Magnolia,.Texas U.S.A.
I dont have my 96 with me but in the 99NEC 318-11 the spacing is allowed for ampacity reasons(derating)

[This message has been edited by txsparky (edited 01-30-2003).]

#83425 - 01/30/03 02:05 PM Re: Cable Tray
Redsy Offline

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
The spacing configuration you refer to permits ampacities in accordance with Table B.103.3 in Annex B of the '02 code.
Otherwise, 392.9 refers to tray fill based on cable sizes.

[This message has been edited by Redsy (edited 01-30-2003).]

#83426 - 01/31/03 06:27 AM Re: Cable Tray
JBD Offline

Registered: 07/12/01
Posts: 599
Loc: WI, USA
FYI - There is a website with application answers, sponsored by cabletray manufacturers -


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