Safety Switches. A.K.A.  RCD (Residual Current Device) or ELCB (Earth Leakage Circuit Breaker) or RCBO (Residual Current Circuit Breaker with Over-current Protection) Why do you need them and how do they work? In NSW Safety Switches are mandatory in all new buildings and must be added if extensions or alterations are made to an existing building. … Continue reading Safety Switches NSW