Can a sealing gasket be installed on the interior of the enclosure to maintain the rating?

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Queston

When a Type 3R metal enclosure is penetrated with a conduit, can a sealing gasket be installed on the interior of the enclosure to maintain the rating?

 

Answer

No, UL lists sealing gaskets under the product category “Outlet Bushings and Fittings, (QCRV).” Guide Information for this category can be found in UL’s Online Certifications Directory at www.ul.com/database and on page 296 in the 2010 UL White Book.

Sealing gaskets are intended for use with threaded rigid metal conduit and intermediate metal conduit with one sealing gasket on the outside and an ordinary locknut or sealing locknut on the opposite side of the enclosure for wet locations or liquid-tight applications. Sealing gaskets may also be used with listed wet location or liquid-tight fittings where so marked on the fitting carton.