[RE-wrenches] Trench Wiring - Ampacity Derating

[cwarfel]

I think the factors you have to consider include:

- the number of conductors in the trench,

-are they in a jacketed cable,

-are they separate conductors,

-are they considered "closely bundled",

-what is the distance of the conductor system once it exits the ground 
before entering a conditioned space, and will it be in conduit.

Chris


On 8/5/2017 5:36 PM, Corey Shalanski wrote:
> How should we treat direct burial wires in a trench for ampacity 
> derating purposes?
> - Should they be considered "in a raceway or cable"? [NEC 310.15(B)(3)(a)]
> - If it is determined that "spacing" must be maintained, what minimum 
> spacing is acceptable/permissible?
>
> I would be interested to hear what means and methods others have used 
> to deal with this issue.
>
> --
> Corey Shalanski
> Joule Energy
> New Orleans, LA
>
>
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-- 
Christopher Warfel, PE
Entech Engineering, Inc.
401-466-8978

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