That is not correct. In one house I had the mains was on a spur along our row of houses. One day the neutral developed a fault and got disconnected. The result was that we experienced twice the mains voltage in our houses.This caused lights to fail and also electronic items like the Hi-Fi amplifier which was being used as a baby monitor at the time.We got twice the voltage because the return was then coming from one of the other phases. If the neutral had been connected to the ground this would not have happened.