Rigid elbow be considered encased under a slab

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JJWalecka

JJWalecka

Senior Member
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New England
Would a rigid elbow be considered encased by two inches of concrete if buried under a two inch slab?

Would the concrete have to encircle the rigid elbow?

Thank you for your time and effort.

Justin J. Walecka
 
Re: Rigid elbow be considered encased under a slab

JJWalecka said:
Would a rigid elbow be considered encased by two inches of concrete if buried under a two inch slab?

Would the concrete have to encircle the rigid elbow?

Thank you for your time and effort.

Justin J. Walecka
Click to expand...

314.29 Boxes, Conduit Bodies, and Handhole Enclosures to Be Accessible.
Boxes, conduit bodies, and handhole enclosures shall be installed so that the wiring contained in them can be rendered accessible without removing any part of the building or, in underground circuits, without excavating sidewalks, paving, earth, or other substance that is to be used to establish the finished grade.
 
Justin,
If you are asking about Exception #3 to 250.86, I would accept it, but the installation does not meet the letter of the code rule and others would be likely to red tag it.
Don
 
Thank you to all for your time.

I am referring to;

250.86 Other conductors Enclosures and raceway

Exception No. 3

A Metal elbow shall not be required to be grounded where it is installed in a nonmetallic raceway and is isolated from possible contact by a minimum cover of 18 inches to any part of the elbow or it is ENCASED in not less than 2 inches of concrete.

Would the elbow be Encased as duplicated here if under a 2 inch slab?
 
encased is just that ENCASED all the way around the conduit ...
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While I agree that the letter of the rule requires encasement, however I would still accept this installation. The purpose of the rule is to prevent contact with a possibly energized isolated metal raceway. The installation in the original post prevents this contact. There would be no increase in safety by encasing it completely. You need to check with your AHJ as he may enforce the letter of the rule, but he could also accept it using 90.4.
Don
 
This is what makes working with the NEC, job experience and some common sense a good mixture. As has been said before the NEC cannot think of every example in the working world, and safety is the bottom line.
Like Don, I think this would be acceptable, as it would be a safe installation.
 
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