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Posted by RBM on September 8, 2006, 5:09 pm
There is typically no gasket because the metal of the box has a slightly
raised collar that fits under the hub. water would run around the collar
rather than into the enclosure
No sealant is used for threaded pipe
Two locknuts is fine for the bottom of the enclosure, be sure to use a
threaded bushing
> Hello,
>
> I'm somewhat familiar with the use of different electrical metal
> conduits (e.g. RMC and EMT), but I'm wondering what additional
> procedures are required when making up connections outdoors. A few
> questions:
>
> 1) For an overhead connection to a box (enclosure), a hub is typically
> held onto the top of the box by 4 screws. Is the mating of the two
> metal surfaces raintight, or is an additional washer or silicone
> needed between the two surfaces?
>
> 2) For a threaded RMC connection, is any silicone or other thread
> sealant required?
>
> 3) When making an RMC connection to a knockout at the bottom of a box
> (enclosure), is the use of two locknuts sufficient, or is a
> different termination fitting required?
>
> Thanks, Wayne
>
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