Earth Loop & RCD Testers
About Earth Loop & RCD Testers
Earth loop testers can be used to easily identify and measure earth loops present within electrical systems, verifying the loop impedance of live electrical circuits. Most work without having to disconnect the electrical supply and are designed not to trip RCDs attached to a circuit.
Also designed to work across phase to earth, phase to neutral and phase to phase connections, earth loop testers can use either 2-wire or 3-wire testing methods to evaluate earth loops.
RCD testers are designed to specifically measure that RCDs are correctly integrated into a circuit. When testing, the RCD tester will apply trip current levels to the RCD, allowing the user to ascertain at what threshold the RCD will trip. Many testers include automatic 'ramp' testing which will cycle through the available ranges until the correct tripping level is ascertained.