Header Graphic

Calibrating RCDT - Residual Current Device Testers

According to the QLD Electrical Safety Act 2002 -  Section 18 - (2)(b) : if a testing instrument can not be visually confirmed as being correctly functioning and safe — that the instrument is tested at least every 6 months to ensure it is in proper working order.


RCD Current measurement
RDC Tests Phase Start Angle
RCD Trip Time Measurement
RCD Current Duration Measurement
Line Voltage Measurement



RCD (Residual Current Devices) operate by sensing when a current flow in the live and neutral conductors within an installation are not equal and opposite. Any imbalance implies that an additional current path exists, typically through the earth due to excessive leakage or fault situation.


RCD testers are designed to simulate a range of fault currents, and to time the operation of the device. This will indicate the ability of the RCD to interrupt a particular fault current within the specified time limits to ensure protection against electrocution, fire or damage. Calibration ensures that a tester complies to its manufacturers specifications and can accurately test an RCD for a Pass / Fail result.


Ensure your equipment is in specification so that the RCD testing you do is conducted in accordance with AS/NZS 3760 "In-service safety inspection and testing of electrical equipment" and AS/NZS 3190 "Approval and test specification – Residual current devices (current-operated earth-leakage devices)"



All measurements are traceable to national and international standards via a registered NATA laboratory or a mutually recognised international testing authority. (See NATA’s International Activities