15 Unfortunately, the amperage that can be delivered to loads. it would require bumping up one conduit size and you don't want to), and if you are under a version of the NEC that only requires it for voltage drop, and if the minimum size checks out for voltage drop and you are upsizing the circuit conductors for some other reason, then you could skip upsizing the EGC and just use #6 or #4 per the OCPD size. 150 amps has been considered the minimum for a small home and. So if you have a compelling reason not to upsize the EGC (e.g. Adding 60 to 80 amp subpanel with 4 Aluminum SER service entrance wire from 150 amp main panel. (hence the 200 amp service) According to the online load calculator, I should end up needing a max. This is the main circuit breaker, and its amperage rating will be something like 60, 100, 150, or 200 amps. I want to install an indoor breaker box with 200 amp service about 5. Unfortunately the garage is finished and located at ground level. 35 ft across the attic (which is above the second floor) and around 30-35 down to the garage (below the kitchen level). Probably 30 ft to the attic from the breaker in the kitchen (1st floor). Im wanting to run a 30 amp 240v to my garage. At the top or bottom end of the two rows of branch circuit breakers, there will be a central circuit breaker that controls the power to the entire panel. Add 240V to Garage through New Sub-Panel. The wording on that section has changed some in the past decade, so depending on which version of the NEC you are under (2014, 2017, or 2020), it may be that the EGC upsizing only applies when the circuit conductors are upsized for voltage drop, rather than in all cases. The amperage of these individual breakers will be between 15 and 50 amps, usually. This rule is found in the NEC as 250.122(B). Or if you put 4/0 Al on a 125A breaker, you need to use a #2 Al EGC. So if you put 1/0 Al on a 100A breaker, you should use a #5 Al EGC (which isn't commonly available, so use #4). When your circuit conductors are upsized, the EGC should be upsized correspondingly. for a 100A breaker, #1 Al for a 125A breaker, 1/0 Al for a load up to 120A, or 2/0 Al for a load of 120.5A to 125A for a 150A breaker, 2/0 Al for a load of up to 135A, or 3/0 Al for a load of 135.5A to 150A. However, this assumes that your circuit conductors are the minimum size allowed for the feeder. How would you provide a 150A supply for this feeder? In the few panels I'm familiar with, 2 position double pole breakers max out at 125A, so 150A would require a special 4 position double pole breaker.Īs to sizing the EGC, it works like this: in aluminum, a #6 EGC is good for up to 100A, and a #4 EGC is good for up to 200A. Also check on the equipment specs on both ends, whether the lugs provided can accept 4/0 wire (if not, you can splice to a smaller size at each end, but that's some trouble). I hear PVC conduit is expensive these days, not sure how big a difference 2" vs 3" would be (there's also 2-1/2"). I expect that for aluminum wire, the cost difference between 2/0, 3/0 and 4/0 will be low.
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