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#77271 05/19/01 07:23 AM
Joined: May 2001
Posts: 129
F
frodo Offline OP
Member
given a 24" cable tray that contains only 500mcm stacked in layers what is the violation there?

twelve 500mcm cables are distributed across the bottom of the tray...ladder type...on top of those is another layer.

as i read the code it doesnt allow for this.

given the addition of multi-conductor cables it gets even more restrictive.

thanks for any input

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#77272 05/19/01 08:24 PM
Joined: Apr 2001
Posts: 507
G
Member
OK Frodo,
I'm bored and no one else has answered, I'll bite.

318-10(1) seems clear with no provisions for exceptions.

Single conductor cables, 2000v or less,

(1) Where all cables are 1000kcmil or larger, the sum of the diameters shall not exceed the cable tray width.

GJ

#77273 05/19/01 08:29 PM
Joined: Apr 2001
Posts: 507
G
Member
If the voltage is over 2kv, (this is a powerhouse, right?)
then 318-12 and 318-13 are even more restrictive.

#77274 05/19/01 08:32 PM
Joined: Apr 2001
Posts: 507
G
Member
It's Saturday night and I'm digging thru the NEC and posting at ECN........

man, I gotta' get a life. [Linked Image] [Linked Image] [Linked Image]

#77275 05/19/01 09:31 PM
Joined: May 2001
Posts: 129
F
frodo Offline OP
Member
Quote
Originally posted by golf junkie:
It's Saturday night and I'm digging thru the NEC and posting at ECN........

man, I gotta' get a life. [Linked Image] [Linked Image] [Linked Image]

yeah its sat night and being away from home is about as bad...

yes it is a powerhouse...but the voltage is 480vac...

the contractor is not even attempting to follow the nec on the job...

there are a lot of violations around....this is one that i really wanted to be sure on so i figured i would ask for some opinions..they have stacked a couple layers of 500MCM conductors in a 24" tray and i think they are planning on dumping some control cables in there as well as some multi-conductor power cables...3/C 12, etc...

ge requires that the nec be followed if it is on our equipment even if it is a powerhouse...i have never seen a job where the nec was not recognized..

pictures available

thanks for the input

#77276 05/19/01 10:10 PM
Joined: May 2001
Posts: 129
F
frodo Offline OP
Member
Quote
Originally posted by golf junkie:
OK Frodo,
I'm bored and no one else has answered, I'll bite.

318-10(1) seems clear with no provisions for exceptions.

Single conductor cables, 2000v or less,

(1) Where all cables are 1000kcmil or larger, the sum of the diameters shall not exceed the cable tray width.

GJ

don't you mean 318-10 (2) 500mcm are smaller than 1000kcmil i thought?

i was thinking 318-8, 9 & 10 covered it pretty well, indicating that you can not stack single conductors except for grouping?

#77277 05/19/01 10:35 PM
Joined: Apr 2001
Posts: 507
G
Member
Frodo,
You're right....
I had confused the conductor size with your post on seal offs.

My bad.

GJ


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