![]() It’s thicker than EMT and suitable for outdoor applications, all while being easy to handle. Next is intermediate metal conduit, or IMC. It’s thin to the point that you can use a conduit bender for it however, it cannot be threaded and is best used indoors and in concrete. Here are some of the common ones used for service connections.įirst is electrical metallic tubing, or EMT. ![]() Types of Conduitĭifferent materials can be used as conduits. ![]() The NEC provides several diameters for your reference in Chapter 9. Lastly, select the size needed for your choice of conduit. For instance, a 350 feet run of copper will need 300 kcmil wires, while a 50 feet run of the same material will need 2/0 AWG.Īfter determining the wire thickness, we need to determine the cross-sectional area of the wires that we will use.ĭetermine the number of wires that will be used, calculate their total area using chapter 9 of the NEC, and check the maximum space allowable. The voltage drop must not exceed 3%, so the wires must be thicker for longer runs. Copper wires have better current ratings than aluminum ones, so copper wires may be thinner than aluminum wires.Īlso, the voltage drop must also be considered. Ways to Determine Conduit Size for 200 Amp Serviceįirst, to determine the 200 amp service conduit size, we have to know the wire used, especially the material. Having more than two 90 degree bends in the conduit will decrease the maximum allowable occupied space by 15%. Thus, the cable must only occupy 40% of the conduit.Īlso, the number of 90 degree bends in the conduit will also affect the conduit size. Usually, a 200 amp service entrance cable may be a triplex (3 wires) for single phase, or quadruplex (4 wires) for three-phase service.
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