Hi, I'm a newby hear and wonder if anyone can help me with this question. I work on a ship and our sockets are 2 phase 220volt instead of Live and Neutral 220volt, i.e we do not have a star point at our transformer. Our network voltage is 11KV / 440v Delta / Delta and then transformed down to 440v Delta / 220v Delta wound. Will RCCD's work on this sytem as there is no earthed star point at the supply transformer for the leakage current to return to on the low voltage side of our installation.