Cutting & reaming conduit. EMT can be cut using a tubing cutter or a simple hacksaw. After cutting, be sure to “ream,” or smooth, the edges with a round metal file. If you don’t, burrs or ragged edges could damage the conductors.
Conduit routing logistics. If the simplest route you can plan still contains more than a total of 360 degrees in bends, installing a pull box in a central location (and definitely at a T intersection where a conduit splits in two) will help ease the wires through the route. After the wires are pulled, add a faceplate to conceal the exposed wires. If you don’t have the need for a pull box, simply use corner elbows.
Conduit straps should be used to anchor EMT 3 feet from a pull box and no more than every 10 feet elsewhere in the run. Depending on the surface to which the conduit is being mounted, use the appropriate fastening devices.
Making conduit connections. Sections of EMT can be joined using threadless setscrew couplings. End pieces of conduit slip inside either end of the coupling and are tightened down with setscrews. Elbow fittings come with their own dedicated setscrews.
Joining conduit to boxes. With indoor applications, metal conduit runs to a square or octagonal metal box through a knockout. Choose a box that is large enough to easily accommodate the size of the conduit.
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