Types of RCDs

Further information:

Meter box mounted RCDs

RCDs are required by law to be fitted to the power and lighting circuits of new homes and houses for sale or lease.

They are generally located alongside circuit breakers in the main meter box or distribution board of the residence. They can be distinguished from the circuit breakers by the test button.

A minimum of two RCDs are required to ensure some light and power remains if one operates. Two RCDs also reduces the possibility of tripping due to some appliances which have low levels of earth leakage.

Combination RCD and circuit breakers

Home owners can choose to install combined circuit breaker and RCDs. These devices protect the electrical circuits and appliances as well as preventing electrocution. Various brands are available.

These combination RCDs are an attractive option for retro-fitting into existing meter boxes with little or no spare space.

Portable RCDs

Portable RCDs attached to a power board or extension lead are available. RCDs on power boards and extension leads only protect the circuits of appliances connected to them. They are essential for people using power tools or electrical appliances outside that are not protected by a meter box RCD or power point RCD.

Power point RCDs

RCDs may be fitted to a power point and can be distinguished by the test button on the face plate. They must be fitted to the first power point after the meter box. They are suitable for protecting electrical appliances in specific areas such as bathrooms and workshops.