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The Characteristics of Raintight EMT Fittings

The Characteristics of Raintight EMT Fittings

When running EMT in wet locations or in areas exposed to rain and moisture outdoors or indoors, raintight fittings are the order of the day. They protect against water seeping into conduit, outlet boxes or other enclosures.

Electrical manufacturers have marketed raintight EMT compression style fittings for many years. However, in March 2002, UL (Underwriters Laboratories) rescinded all manufacturers¡¯ Raintight listings on EMT fittings because UL testing in accordance with UL Standard 514B the previous year had found that 38% of the tested products were not, in actuality, raintight.

After the rescinding, Underwriters Laboratory required EMT fittings to undergo an upgraded testing and listing process in order to be marked raintight. The testing and listing process incorporates revisions to UL¡¯s Follow-up Testing Program for products listed in accordance with the UL Standard 514B. (UL did not rescind any Listings for rigid fittings.)

New UL Listed Raintight EMT fittings marked ¡°Raintight¡± (available in zinc die-cast and steel), have been redesigned to meet the Standard. While the features contributing to the fittings achieving a raintight state may differ among manufacturers somewhat, the intent is the same ¨C to be raintight.

For example, compression EMT fittings marketed by Sanling Fittings, Inc., marked Raintight, have an internal plastic sealing ring that seals around the tubing when the hex nut is tightened, in addition to the usual split ring on the inside that firmly grips the EMT and maintains electrical conductivity for grounding. And for connectors that terminate in a knockout box, there is a knockout gasket that prevents water from entering the box.