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Allowable Fill For Outdoor Cable Trench

Allowable Fill For Outdoor Cable Trench

Allowable Fill For Outdoor Cable Trench

(OP)
I've looked through the NEC but I can't seem to find anything that points to the allowable fill for outdoor precast cable trench. Does anyone know the applicable guide/section for this?

RE: Allowable Fill For Outdoor Cable Trench

In my opinion, if the trench is not exposed to sunshine then:
Art.390 Underfloor Raceways
(C) Trench-Type Raceways Flush with Concrete
390.6 Maximum Number of Conductors in Raceway
shall not exceed 40 percent of the interior crosssectional area of the raceway.

RE: Allowable Fill For Outdoor Cable Trench

(OP)
Thanks for your reply! I saw that section as well but this is going to be outdoor and will definitely be exposed to sunshine/weather. I'm still struggling to locate any guidelines on this.

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