The new ‘17th’ edition of the wiring regulations (BS7671) came into effect on 1st July 2008.

One of the major changes in the new regulations is in the mandatory use of residual current devices. Whilst RCDs have been around for many years, the new regulations require their use in many more applications...

Under the new regulations all socket outlets in a domestic installation must be protected by an RCD with a trip rating not greater than 30mA. 

Cables concealed in walls or partitions at a depth of less than 50mm must now be protected by a 30mA RCD if they are not mechanically protected.

All circuits in locations containing a bath or shower must now be protected by an RCD not exceeding 30mA

All circuits should not be connected to a single RCD as this would mean a loss of power to the entire property if a fault developed on a single circuit.