It's tough for me to imagine how 100 amps wouldn't be more than adequate. Of course, you don't need to run a full 200 amp feeder to your shop as this seems like total overkill unless you have some very special requirements. You will have to look at that table for specifics but it allows you to use 1 or 2 sizes smaller wire if you qualify. Distance Aside from the branch circuit wiring, another important thing to consider when installing a service panel is the wire used for the service entrance. 12 gauge is a little thicker than 14 gauge, and 10. This table lets you use an undersized feeder wire. What is the Recommended Size Wire for a 200 Amp Service Panel at 300 Ft. 14 gauge wire is normally the smallest wire that you will find in the service panel. We will show you how this 250A ampacity is calculated. If that is a separate 200 amp service to feed your shop (just located at the house) and it feeds only the shop you can use smaller feeder wires under the special table in the NEC for feeders that supply 100 percent of the load. The 250 KCMIL wire is the perfect size wire for 200 amp service because it has 255A ampacity (a minimum of 250A ampacity requirement is satisfied). That bare aluminum wire in your picture is your neutral. I don't have my ampacity table handy but as I recall you need 3/0 copper or 250kcmil aluminum for 200 amps with 75 degree rated terminations.įor 3 3/0 copper and one #4 ground you need 2 inch conduit sch 40 PVC for under 40 percent fill ratio. Two phase wires (hots) and neutral and a ground. Based on what I see in the picture I'm looking at running 2 large insulated wires (probably aluminum wire I assume?) Do I also need to run a ground wire? I've got a permit and I plan to have an Electrician help me with the actual connecting of all the wires.Ĭan I get some help with a recommendation on the wires I need to run between the house and the shop? Please understand I've got very little knowledge in this arena. for the shop so once I get the feeder wire in there I'm ready to get started. At 75 degrees C, 3/0 Al is 155 amps and 4/0 Al is good for 180 amps so 4/0 Al with 3/0 AL neutral would be my guess. I've bought the breaker panel and all the boxes, wire, etc. I won't stake my life on this so it's a comment. The shop has a ground lug already installed in the foundation. I've measured the string and I'm going to need 90' of wire to connect the house panel to the shop panel. I've got a 2" (Inside Diameter measurement) conduit running between the house and the shop. House has 400A total and was pre-wired with a 200A service to feed the shop (see photo) ![]() I've got a detached shop that I'm trying to get wired up. What wire size do I need for a 200A residential service Ask Question Asked 2 years, 4 months ago Modified 2 years, 4 months ago Viewed 3k times 1 I’m planning on upgrading my electrical service to 200 amps but I’m not sure what aluminum wire size I need.
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