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How to Install a PVC Coated Metal Conduit Fitting
Special Tripod Instructions
- 1). When applying a fitting to rigid conduit, it is often necessary to clamp the end of the pipe into a threading tripod in order to keep the pipe firmly stationary.
- 2). With PVC-coated pipe, however, it is important to protect the PVC coating from the teeth of the clamp by first cutting a 6-inch piece of rigid conduit with a band saw, then cutting it down the middle with a Sawzall (or sabre) saw.
- 3). Afterward, place it around the PVC-coated pipe and tighten the clamp around the section of rigid conduit. The cut down the middle will allow the 6-inch piece to close around the PVC-coated pipe and keep it stationary without damaging it.
- 1). When you have to cut the PVC-coated conduit in order to add a fitting, use an electric band saw for cutting instead of the industrial tube cutter that is often used, as the tube cutter will cause serious damage to the PVC coating.
- 2). Ream the inside of the pipe out with a file to prevent any sharp edges from cutting wires.
- 3). Wipe any shavings from the pipe with a rag.
- 1). After cutting the pipe, it is necessary to first thread it with either a hand threader or a hand-held electrical pipe threader. Before doing this, however, you will have to remove the PVC coating so that the threader will fit onto the pipe. Do this by making a deep cut around the diameter of the pipe about one inch back from the end of the pipe with a sharp pocket knife, then make another deep cut from that original to the end of the pipe. Now you can easily peel the 1-inch piece of PVC off with a little help from the knife.
- 2). Place the threader onto the end of the pipe and thread the pipe until there is at least one inch of thread. Be sure to add cutting oil to prevent damage to the threading die.
- 3). Wipe off all the cutting oil with a rag after threading the pipe.
Applying the Fitting
- 1). Now that you are ready to apply the fitting, do so as you normally would, by spinning the coupling or angle fitting onto the threads.
- 2). When tightening it, however, you will use either a cloth-strap wrench or leather-strap wrench instead of channel locks or a chain wrench.
- 3). If you do not have a cloth-strap wrench, you cut another small piece of pipe in the aforementioned manner, albeit customized to fit the fitting you are using, and simply tighten using channel locks or a chain wrench.