MEXICOWANDERER wrote:
NYET You are stuck in DC logic. nununu
Only the n or the u of the sine wave can be occupied by any one phase. Even two phases occupy 66% of the total ampacity. Three phases will occupy 100% of the ampacity. This is why "measuring" neutral is tricky.
Achieving BALANCE of voltages is the crucial element. On a three phase system phase to neutral then phase to phase is vital for a healthy system. I have seen insanely imbalanced 3 phase wye systems down here with 90 volt phases with an orphan measuring 145+ to neutral. This is where a trained electrician earns his money. Above 12 Kv a trained engineer is the best bet. Especially in sub stations where multi transformers of different voltages may be present.
I think he was talking about the neutral in the RV cord. Yes, a cheater could overload it since both 50A 120V legs are sending current down it at the same time.
This is the reason why shared neutral household wiring requires a double pole breaker. It’s to make sure each individual circuit is on the opposite phase and doesn’t overload the neutral. My 1970”s house had a couple of shared neutral circuits but ironically the breakers didn’t have their bridging bar. The inspector flagged it when I went to sell. I swapped them for legit 240V ones and was good to go.
