The Standards and Calibration Laboratory (SCL) has developed a calibration service for the Residual Current Device (RCD) tester. This service was peer reviewed by Dr Murray Early, Principal Research Scientist of the Measurement Standards Laboratory of New Zealand, in December 2018.

An RCD is a device that instantly breaks an electric circuit when it detects current leakage to protect a human body from injury caused by electric shock. According to the Code of Practice for the Electricity (Wiring) Regulations issued by the Electrical and Mechanical Services Department (EMSD), the function of residual current devices should be checked by an RCD tester. The new calibration service for RCD tester calibrates the trip time measurement accuracy and the residual current output accuracy, the two essential parameters in an RCD tester.