Working with conduit requires using special fixtures to joint the pipes to each other and to boxes. This section illustrates the most common couplers.

Joining sections end to end

To join sections end to end, use either setscrew or compression couplings, securely fitted.

Anchoring the conduit

Anchor conduit runs with at least one strap every 8 feet and a strap within 3 feet of every box. For masonry walls, use screws and plastic anchors. When attaching to framing, simply drive barbed straps into the wood.

To mount conduit inside walls, bore holes in the studs (see Running Cable in Finished Space, Related Projects), or notch the framing and secure it with straps or metal plates every 8 feet.

The various types of box connectors differ mainly in the way they attach to conduit. Compression connectors grab the conduit as you tighten the nut with a wrench. To install a setscrew connector, slip it on and tighten the screw. Both types are available in 90-degree versions.

All these connectors attach to the box with the same threaded stud and locknut arrangement used with cable connectors (see Connecting Cable to Boxes, Related Projects). Insert the stud into a knockout hole, turn the locknut finger tight, then tap the nut with a hammer and screwdriver to tighten it. A two-piece connector comes in handy when space is tight inside a box. Instead of a locknut, it has a compression fitting. As you tighten the nut, the fitting squeezes the conduit.