Alternate to conduit chairs

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cadpoint

cadpoint

Senior Member
Location
Durham, NC
Occupation
Electrician - but not by NC Law.
Do you even have to support 4" conduits in the dirt, telephone or other wise?

In a parking deck lowest floor in dirt under the slab to be below required miminum, this will be a single row of 6 - 4" in the dirt, is there anything other than chairs?

I don't want to even use kendorf and straps. This will not have a concrete incasement either.

Any suggestions ?
 
most of the time I use crushed stone for backfill under a slab. nothing fancy, just make a somewhat smooth bed for the conduit to lay on, then cover it with more stone.
 
sometimes we save old 3/4 and 1/2 emt just for that purpose (thats a waste of kendorf) chairs make nicer pictures tho
 
cadpoint said:
Do you even have to support 4" conduits in the dirt, telephone or other wise?

In a parking deck lowest floor in dirt under the slab to be below required miminum, this will be a single row of 6 - 4" in the dirt, is there anything other than chairs?

I don't want to even use kendorf and straps. This will not have a concrete incasement either.

Any suggestions ?
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What's a kendorf??? supply houses around here can't even spell that !
 
Manufactured sand or flowable fill. I do not see the need for conduit chairs when concrete encasement is not required. Depending on your labor rates the amount of labor to properly compact a trench will far outweigh the cost of manufactured sand or flowable fill.
 
dcspector said:
A lot of Inspectors and Electricians (should be the same) feel that is a violation of 300.5(F) "sharply angular substances"
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I almost posted this same response earlier, then read 300.(5) again. If the crushed rock is small enough, then IMO it would not contribute to this.

where materials may damage raceways,
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chris kennedy said:
I almost posted this same response earlier, then read 300.(5) again. If the crushed rock is small enough, then IMO it would not contribute to this.
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Chris I just threw that out there. The reasoning from others was due to mechanical compaction. I personnaly am silent on that one. I usually check specs for engineering requirements.....most of the time it is sand.
 
dcspector said:
most of the time it is sand.
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Yeah, thats what I use, usually have some lying around.


Lifeskillsunderground12-5012.jpg
 
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