Every type of conduit has a listed approved series of connectors and couplings that are designed to be used as fittings for those specific raceways. Today we look at EMT couplings and connectors - set screw, compression, and rain-tight more specifically.

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COUPLINGS
Let’s start out with couplings. A coupling is literally used to “couple” two pieces of conduit together. There are various styles of couplings, each with it’s own unique purpose that we’ll get into in this article. A coupling is the same on both sides, so there’s no right way to put it on. There are, however, some considerations that should be made when using set screw connectors for aesthetics and workability in the future.

CONNECTORS
Connectors look very similar to couplings but have a distinct difference. Connectors are meant to slide over the end of a piece of conduit on one side, and tighten down to the inside of a box or enclosure on the other end. You use connectors at the ends of conduit runs to land into a box. You will almost always use both couplings and connectors in every conduit run together.

SET-SCREW
Set-screw connectors are used indoors only. They’re not designed to withstand wet conditions, so we only use them in buildings. They work by tightening a set-screw down on the conduit once it is slid in place to keep a firm connection to the conduit. Larger sizes of couplings and connectors will have multiple set-screws that you have to use to properly secure the fitting to the conduit.

Using set-screw style connectors and couplings is often times much quicker than using compression fittings, as all you need to do is tighten the screw down and move on.

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