Earth Leakage Testing & Trouble Shooting Nuisance Tripping
Nuisance tripping is a common problem that occurs when an RCD trips when the residual current flowing in the circuit is less than its rated residual operating current.This may be caused by a current surge, voltage surge, or possibly noise on the installation.
One of the most common faults that leads to repeat call-outs is the cumulative leakage current from modern appliances and plug-in power supplies in commercial and industrial installations. These devices generate low levels of leakage current even when there is no fault present. When several appliances are connected to the same circuit, their leakage currents add up and exceed the trip threshold of the RCD protecting the circuit, causing the power to cut out unexpectedly. Earth leakage testing using specified leakage clamps helps quantify the leakage currents flowing at various circuits and is the most recommended method to troubleshoot and rectify nuisance tripping solutions.