I never suggested anything - that was Jim Michaels. I was just backing him up slightly using what little knowledge I have of these things.
It needn't be a fault condition which causes an imbalance though, if tiny is sufficient. But tiny isn't going to cause anyone any harm. I'd suggest that if there were a large enough imbalance in currents in the two halves of one leg of the ring to be worried, there probably is a fault somewhere which should be rectified before somebody plugs two 3kW heaters into a double socket and melts something.
Hwyl!
M.