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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