EMT stands for electrical metallic tubing, and is a thin-walled raceway that electricians use to pass conductors through. EMT is used indoors and outdoors, and there are several types like Aluminum, Galvanized, and Stainless that can be used in different situations and at different price-points. EMT is allowed to be used in dry, damp, and wet locations as well as in concrete or direct contact with the earth as long as you follow You cannot install EMT where it is subject to physical damage, or where it is used as a support for a luminaire or other equipment.
For both of these RMC rigid metal conduit would be acceptable. Galvanic action is a serious issue to look into when dealing with dissimilar metals touching each other. This is especially dangerous when using EMT as an equipment grounding conductor. Over a long enough time, that one complete conduit system may turn into several disjointed segments due to corrosion, leaving you with no equipment ground.
There are minimum and maximum trade sizes that are allowed to be used as EMT. This makes damaging the conductors inside more likely, as well as more difficult to pull in or out.
So that means no more than 4 degree bends from one box to another. They shield the wires from the external environment so as to make the wire last longer and also to keep humans and pets safe from electric shocks or other such vulnerabilities. Electrical conduits are predominantly made of insulating and sturdy material for optimum functionality.
Although it is best suited for a professional electrician to accomplish most electrical conduit fittings, there are some minor ones that you can easily do on your own. Log in Social login does not work in incognito and private browsers. Please log in with your username or email to continue. No account yet? Create an account. Edit this Article. We use cookies to make wikiHow great. By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow.
Download Article Explore this Article Steps. Tips and Warnings. Things You'll Need. Related Articles. Author Info Last Updated: July 12, Choose the right material for installing electrical conduit fittings: The most preferred material is known as EMT Electrical Metallic Tubing.
EMT is very easy to install as you can effortlessly bend it and assemble it as per your needs. Also, you can conveniently take it off in case your wiring goes wrong somewhere. If you do not have it in your house, you can buy EMT from any of the electrical surplus stores for pretty cheap.
Chalk out a wiring plan: Find out the location of the electrical boxes on your wall to trace the route of the conduit. Draw the path from the main power source to the electrical box. Measure the amount of conduit that you would need: Make appropriate marks in pencil wherever you think the bends should be, and measure the total length of the conduit that would be needed to finish the entire electrical conduit fittings. Now cut the length that you just measured with a tool called hacksaw.
The cut ends are likely to have burrs which can be removed using a deburring tool or with pliers. Make the necessary bends: It is now time to make bends that you had marked on the pipe in the previous step.
Owing to the easy flexibility of EMT, this should not be very difficult. Conduit benders come in handy for doing this bending. Attach fittings to the wall: You can use screws and straps with either single or double holes, available at electrical surplus shops, to attach electrical conduit fittings to the wall. Tape the ends and put the wires in place: Use a widely available fish tape and run it through the entire route of the conduit fittings you just installed.
A coupling joins two pieces of conduit end to end. A sweep makes a slow turn, allowing wires to slide easily, while a pulling elbow makes a sharper turn. Setscrew fittings are commonly used with EMT conduit; they provide joints that are firm but not waterproof. For weathertight joints, use IMC conduit and compression fittings. Oftentimes, it's easiest to just make a drawing of your proposed installation and have a salesperson help you assemble all the parts you need—conduit, sweeps, elbows, boxes, and clamps.
And make sure to buy plenty of wire. Anchor metal boxes to the wall with screws. For exposed wiring use handy boxes, which have rounded edges and metal covers. An offset fitting allows the conduit to run tight up against the wall. Once the boxes are installed, measure the conduit for cutting. The surest method is to hold a piece in place and mark it, rather than using a tape measure. Remember that the conduit slides about an inch into each fitting. Cut the conduit to fit with a hacksaw.
Do not use a tubing cutter, which creates sharp edges inside the conduit that could damage wire insulation. Remove the burrs inside and out with a conduit-reaming attachment on a screwdriver.
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