One way to reduce RCD test button failure....
Richard Carr
Helping businesses with electrical compliance, to save time, be compliant & be safe by providing an exceptional customer focused service managed through our online portal | electrical | compliance
A common failure which we see time and time again whilst conducting electrical installation condition reports is the failure of the rcd (residual current device) .
There are 2 instances whereby rcd's can fail......
- Electrically, when tested by simulating an earth fault the device does not operate within the required time.
- Mechanically, when the button marked "T" (See picture above) is pressed and the device does not operate.
Dependant on the manufacturer these can be expensive to replace and more often than not there are a number of these types of devices in most modern installations.
What can be done to prevent this?
- Electrically, these are tested periodically by a competent contractor with the necessary qualifications.
- Mechanically, again these are tested periodically by a competent contractor with the necessary qualifications.
Top tip !!!
It is recommended by the manufacturers that the test button on an rcd is pressed, generally on a monthly basis to verify it's mechanical operation. This will help to ensure that the mechanical operation is free and the circuit is protected by the device itself. There is no reason why a designated person within your business cannot do this, therefore reducing the risk of mechanical failure when the contractor comes to carry out your fixed wiring testing.