![]() ![]() Then bag the 200A breaker and leave it in the bottom of the panel for that happy day in the future. The 200A version of the panel is so popular that cost wise, you are probably better off buying the 200A version of that panel, then buying a retrofit 100A main breaker for it. Only difference is you fit a 100A main breaker in the farm panel instead of 200A. Since you expect to go to 200A, I advise still doing the above. If your existing feeder to the house is only 100A, then go ahead and feed it from one of those four 2-pole brakers, just slap a 100A breaker in there (90A if the wire is #2 aluminum or #4 copper).Except my service is only 100A 50A to the RV stand (they don't need more unless there are two RV stands). Then you use the 8 breaker spaces for four 2-pole "feeder breakers" - e.g. You might need a 2-inch rigid metal conduit for 200 amp overhead service, or least a 2 inch schedule 80 PVC pipe for underground service entrances, depending on whether the raceway is subject to physical damage. If you are using a four-wire direct burial cable, then just use the ground wire in the cable as it will be quite amply sized for the job it is doing if you are using PVC conduit, then bare 8AWG copper would be my choice to keep conduit fill down. The idea is you come off the "thru lugs" to the biggest load - e.g. "Thru Lugs" carrying the full 200A onward.In Table 250.66, it lists a 4 AWG copper grounding conductor for 2/0 copper or 4/0 aluminum service conductors, which are the sizes used for 200A services. Top Sellers Most Popular Price Low to High Price High to Low Top Rated Products. In the NEC, there appears to be two tables that contradict each other in regard to the minimum sized equipment grounding conductor. 8 breaker spaces (they also make 4-space versions, avoid - too few). Get free shipping on qualified 200 Service Entrance Wires products or Buy Online Pick Up in Store today in the Electrical Department.welding in the shed with the compressor running. You still want to make each feeder big enough it won't trip on its local loads e.g. But that allows for intermittent and "non-simultaneous use". You are restricted on how much total load you can have on the service, and this is based on a Load Calculation. even though these add up to more than 200A. ![]() So for instance if you have 200A service, it is OK to have 200A going to the house, 100A going to the shed, 50A to an RV stand, 30A to a well, etc. The person is incorrectly applying 310.15(B)(7) on the assumption that your entire service is 100A, and they don't even realize their blunder because they're just giving 4th generation hand-me-down advice from someone else who misapplied 310.15(B)(7).Īctually, you need #1 Al / #3 Cu for 100A, and 310.15(B)(7) is saying that you never need larger than 4/0 (which isn't very helpful lol). Now, often when you go shopping for 100A wire, some fool will tell you "oh use #2 aluminum or #4 copper". So that calculates out to 4/0 aluminum (180A). So any feeder - even if it's 200A feeder - only needs to be 166A not 200A. You never need to use wires larger than that anywhere that's served by that service. NEC 310.15(B)(7)says that you take your entire (planned) service size - 200A - and multiply it by. Apply 310.15(B)(7) to your entire service ![]()
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