This type is available in many trade sizes (from ½ to 6), but it is also expensive due to its strength. Third is rigid metal conduit or RMC, which is made of galvanized steel, aluminum, or brass. 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. I was up and running.ĭecided to install an electric tankless water heater and 150amp sub with three wires because tankless heater only has three wires.Usually, a 200 amp service entrance cable may be a triplex (3 wires) for single phase, or quadruplex (4 wires) for three-phase service. finally after a failed inspection because of #6 wire on my ground rods, individual wires instead of SEU wire and mechanical bolt lugs instead of crimp lugs got a pass the second time. Ran 3 wires to the panel in the trailer and added a #6 solid ground that went to the water pipes. Some shopping around and buying supplies as I could afford. More time goes by and I decide to tackle a 200amp service to the garage in my efforts to get rid of the pole problem. Home at the time had bonded neutral and ground in fuse panel and breaker panel. I decided to replace 50 amp fuse panel that fed our 100 amp panel inside with a 100 amp breaker disconnect and some 4 conductor 2/0 wire. Some time goes by we get decided to try to tackle the service in stages when the wire going from main fuse panel starts showing bare wires that I noticed when I was weeding around the pole. The guy comes over and starts to say your meter pole should be redone sometime soon OMG spent all my money on roofing/plumbing. Gets really interested when we go to have our power turned on. New painted metal roofing new faucets and some new plumping. Slowly did some work to repair what I could. What are the requirements for a breaker panel in a laundry room?Īt Nineteen bought a piece of property with a mobile home and garage. I currently have a #6 solid copper ground in the 100 amp panel going to the water main and looks like a 6 or 8 aluminum going to the trailer frame should I replace this one? What should I do about grounding in both panels. Today I seperated the bonded neutral and ground and straightened out the panel a little bit. Then 2" schedule 80 conduit (because I will have some left over) going from the 200 amp panel in wash room to the 100 amp sub panel.Ģ00 amps because we have an electric tankless water heater electric heat for backup and may add an electric stove. Install 200 amp sub panel in utility/laundry room. I am going to run 2" schedule 80 conduit from the garage to the mobile home 24" underground about 10 feet with expansion couplings 90 feet of wire/conduit total. Right now I am trying to rewire my service that has a 100amp sub panel and 150 am sub panel in my mobile home. I am currently trying to redo this mess of a hack job that I am shocked even passed now.
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