Commercial Parking Lot

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galactic22

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I have a 4160 circut running under a commercial parking lot. Under Table 300.50, Column #6, "under special conditions", it states that it requires a 24 inch deep trench. Can I use column #3 "under general conditions", with RIGID conduit, and need a trench ONLY 6 inches deep or do I have to use coloumn 6 "special conditions'. . . My inspector is telling me 24 inches instead of 6. . . Big difference. . . Thank You!!!
 
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Hv&Lv

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Engineer/Technician
galactic22 said:
I have a 4160 circut running under a commercial parking lot. Under Table 300.50, Column #6, "under special conditions", it states that it requires a 24 inch deep trench. Can I use column #3 "under general conditions", with RIGID conduit, and need a trench ONLY 6 inches deep or do I have to use coloumn 6 "special conditions'. . . My inspector is telling me 24 inches instead of 6. . . Big difference. . . Thank You!!!
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IMO this is the deciding factor beside of Special Conditions; (use if applicable)

Areas Subject to
Vehicular Traffic,
Such as
Thoroughfares and
Commercial Parking
Areas

I would say column 6 is applicable.
 
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jusme123

Senior Member
Location
NY
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JW
...and don't forget he last sentence of 300.5(D)(3) concerning warning ribbon 12" above installation.
 
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david

Senior Member
Location
Pennsylvania
[Tricky question: Commercial parking lot.....

I have a 4160 circuit running under a commercial parking lot. Under Table 300.50, Column #6 , "under special conditions", it states that it requires a 24 inch deep trench. Can i use column #3 "under general conditions", with RIGID conduit, and need a trench ONLY 6 inches deep or do I have to use column 6 "special conditions".... My inspector is telling me 24 inches instead of 6... Big difference...Thank you!!!
Last edited by galactic22; 04-09-13 at 09:43 PM.

04-09-13 10:04 PM #2
david
Originally Posted by galactic22
I have a 4160 circuit running under a commercial parking lot. Under Table 300.50, Column #6 , "under special conditions", it states that it requires a 24 inch deep trench. Can i use column #3 "under general conditions", with RIGID conduit, and need a trench ONLY 6 inches deep or do I have to use column 6 "special conditions".... My inspector is telling me 24 inches instead of 6... Big difference...Thank you!!!

Since your conditions ( commercial parking areas ) is specified in column six and general conditions are for conditions not otherwise specified. I would say you must use column six
 
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