Question pertains to a 200 amp service (second panel) at another building off a 400 (380) amp meter can at the existing home.There was some discussion among us that an old rule of thumb was that the neutral could be two sizes smaller than the ungrounded conductors for the feeder from a 380 (400) meter can, other 200 amp panel unaffected.. Can't remember where the section was that made an allowance to drop two sizes. Had something to do with the balance of the 2 unground conductors in harmony with the neutral. any thoughts?
Thanks in advance
Thanks in advance