Omitting an RCD via a risk assessment is now more restricted and generally not permitted in dwellings. Electricians Guide To The Building Regulations 18th Edition
The 18th Edition places a heavy emphasis on fire safety, protection of sensitive electronic equipment, and the integration of renewable energy technologies. 18th edition IET wiring regulations. Electric w...
: Protection against transient overvoltages is required where consequences could result in serious injury, failure of safety services (like fire alarms), or significant financial/data loss. For other cases, SPDs must be installed unless the owner specifically signs a declaration accepting the risk of equipment damage. Residual Current Devices (RCDs) : Omitting an RCD via a risk assessment is