18th Edition Iet Wiring Regulations. Electric W... Apr 2026

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

RCDs (30mA) are required for socket outlets (up to 32A) where they may be used by children, disabled persons, or in general-use domestic settings. 18th edition IET wiring regulations. Electric w...

: AFDDs are now mandatory for single-phase AC final circuits supplying socket-outlets (up to 32A) in specific high-risk buildings: Higher Risk Residential Buildings (HRRBs). Houses in Multiple Occupation (HMOs). Purpose-built student accommodation and care homes. Omitting an RCD via a risk assessment is

: 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) : Houses in Multiple Occupation (HMOs)

The 18th Edition places a heavy emphasis on fire safety, protection of sensitive electronic equipment, and the integration of renewable energy technologies.

The (BS 7671:2018+A2:2022) is the national standard for electrical installations in the UK. The current version incorporates Amendment 2 (2022) , which became mandatory for all new designs and installations on September 28, 2022. Key Focus Areas and Mandatory Changes