5.10Testing the residual current device#

The RCD is an electromechanical device, having moving parts that can become immovable with age or contaminants. As such, it requires regular activation to ensure that it operates correctly.

Using the test button on the RCD regularly establishes:

1. 1.the RCD is functioning correctly, and
2. 2.the integrity of the electrical and mechanical elements of the tripping device.

However, this test does not provide a means of checking:

1. 3.the continuity of the main earthing conductor or the associated circuit protective earthing conductors
2. 4.any earth electrode or other means of earthing, or
3. 5.any other part of the associated electrical installation earthing.

It is recommended that testing of the RCD for correct operation is carried out at least annually by pressing the test button. More frequent testing may be required, depending on the application. Other tests may be required in accordance with the manufacturer’s recommendations.