[rohrmann]

If you have 240 volts across the two hot legs and have a bad neutral, you will get one leg very low and the other leg will be very high, but those two voltages will add up to 240 volts. I've measured on one occasion 180 volts on one leg and 60 volts on the other, and the lights inside the customer's house were extremely bright, which indicated the lights were on the high leg. A bad splice on the neutral at the weatherhead was the cause, and as soon as it was repaired, the voltage was 120 volts on each leg.