ABSTRACT
Where RCDs and RCBOs are used as additional protection against shock, it is essential that they operate within set parameters. The RCD testers used are designed to do just this, and the basic tests required are as follows (Table 10.1):
1. Set the test instrument to the rating of the RCD. 2. Set the test instrument to half rated trip (1/2IΔn). 3. Operate the instrument and the RCD should not trip. 4. Set the instrument to deliver the full rated tripping current of the
RCD (IΔn). 5. Operate the instrument and the RCD should trip out in the required
time. 6. A 30 mA RCD or less, operating at 5 × IΔn, should trip in 40 ms.
