Outdoor boxes & LB's above ground


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Old 10-16-10, 11:53 AM
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Outdoor boxes & LB's above ground

Is there a rule-of-thumb ---or Code requirement for the distance (inches) above ground for mounting outdoor electrical boxes and LB's?
Measured to bottom of box or LB or to center?
Many thanks!
Bill
 
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Old 10-16-10, 03:40 PM
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There is no code for height of junction boxes or LB fittings outdoors. Common sense must prevail though... if a box or fitting is buried in dirt, it will corrode in a few years. Of course, I dont know much about your project, but I would keep all weather proof boxes and fittings with set screws (like an LB) at least a foot off the ground. This would allow it to be above most snowfall as well. If you can be more specific, so can I.
 
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Old 10-16-10, 04:11 PM
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vjasonv wrote:
and fittings with set screws (like an LB)
Set screw fittings are not rated for outdoor use.
 
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Old 10-16-10, 04:31 PM
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You are correct that set screw fittings should not be used outside... I meant the screws for the cover of a jbox or the cover of an LB. These would rust out and ruin very easily if underground or consistanly wet.

(about set screw fittings... when using EMT outdoor, I'd recommend compression fittings.)
 
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Old 10-16-10, 05:51 PM
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Originally Posted by vjasonv View Post
You are correct that set screw fittings should not be used outside...
Easy for the fingers and brain to get disconnected when typing.
 
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Old 10-16-10, 06:07 PM
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Sounds like a foot off of the ground makes sense.
Many thanks!
Bill
 
 

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