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Old 08-15-2012, 11:18 AM   #1
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cable clustering with plastic ties


i was wondering if there are any overheating/safety issues with clustering many (and how many?) cables that all need to go through a tight area. was curious if many cables beamed together can be more prone to overheating or current fluctuations etc.

e.g. if i had half a dozen to a dozen some 15 some 20A cables all different circuits beamed together with a cable tie, could that be a fire hazard?

thanks

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Old 08-15-2012, 11:44 AM   #2
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cable clustering with plastic ties


do a google search for bundled romex or bundled cables. You will find all kinds of info.

Generally, you cannot bundle cables for a length greater than 24" If you do, then the cable ampacity would have to be derated per NEC guidelines. the amount of bundling you are talking about would require such derating that the cable would be useless.

You can bundle for lengths less than 24" and I don't believe there are NEC requirements regarding that. ***Not Positive***

And yes, overheating and fire hazards are present when you do large bundling because the cable assembly does not have an effective means to dissapate heat when many are stacked next to each other.

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Old 08-15-2012, 11:47 AM   #3
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cable clustering with plastic ties


thanks boss !!

basically, i am branching off a subpanel. and to feed it, the 4 fat 100A wires need to pass through an area that is rougly 3"x3". 1 240V, 1 120V, neutral and ground, all separate wires. do you foresee that as a problem?
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Old 08-15-2012, 12:19 PM   #4
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cable clustering with plastic ties


The conductors need to be in a conduit. They cannot be run in free air.
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Old 08-15-2012, 12:37 PM   #5
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Quote:
Originally Posted by Jim Port
The conductors need to be in a conduit. They cannot be run in free air.
It is all indoors and behind wall
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Old 08-15-2012, 12:44 PM   #6
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cable clustering with plastic ties


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Originally Posted by amakarevic View Post
It is all indoors and behind wall
Doesn't matter. You can't run individual conductors outside of a conduit. Those "4 fat 100A" conductors MUST be in conduit.
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Old 08-15-2012, 01:39 PM   #7
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cable clustering with plastic ties


I never thought you'd be back after the whole panel in the shelf wall post. Prepare for an arguement on how everyone lacks creativity for not seeing that running cables free air is artistic and we're all code Nazi's for telling him it can't be done.

I really hope you didn't run your conductors free air for the last panel post.
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Old 08-15-2012, 01:44 PM   #8
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cable clustering with plastic ties


Actually going back through posts this is about the fourth panel change i see. It's starting to seem like this is your go to place to come for your side job answers lol.
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Old 08-15-2012, 02:55 PM   #9
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Doesn't matter. You can't run individual conductors outside of a conduit. Those "4 fat 100A" conductors MUST be in conduit.
is there such a thing as 3/3 cable?
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Old 08-15-2012, 03:00 PM   #10
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cable clustering with plastic ties


Yup they make Nm service cable
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Old 08-15-2012, 03:50 PM   #11
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Quote:
Originally Posted by andrew79 View Post
Yup they make Nm service cable
Quote:
334.12 Uses Not Permitted.
(A) Types NM, NMC, and NMS. Types NM, NMC, and
NMS cables shall not be permitted as follows:
(1) In any dwelling or structure not specifically permitted
in 334.10(1), (2), and (3)
Exception: Type NM, NMC, and NMS cable shall be permitted
in Type I and II construction when installed within
raceways permitted to be installed in Type I and II
construction.
(2) Exposed in dropped or suspended ceilings in other
than one- and two-family and multifamily dwellings
(3) As service-entrance cable
(4) In commercial garages having hazardous (classified)
locations as defined in 511.3
(5) In theaters and similar locations, except where permitted
in 518.4(B)
(6) In motion picture studios
(7) In storage battery rooms
(8) In hoistways or on elevators or escalators
(9) Embedded in poured cement, concrete, or aggregate
(10) In hazardous (classified) locations, except where permitted
by the following:
a. 501.10(B)(3)
b. 502.10(B)(3)
c. 504.20
However, you could use type SE.

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