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    The 18th Edition of the IET Wiring Regulations

    1st July 2018 > released

    1st January 2019 > came into full effect

Summary of the Main Changes

Requirements for RCD protection 

•    Regulation 411.3.3 now applies to socket outlets rated up to 32A 

•    There is still an exception to omit RCD protection where, other than for an installation in a dwelling, a documented risk assessment determines that RCD protection is not necessary 

Recommended installation of AFDDs 

•    New Regulation 421.1.7 has been introduced recommending the installation of arc fault detection devices in AC final circuits of a fixed installation 

•    The Regulation gives examples of where such devices can be used, including premises with sleeping accommodation and locations with endangering of irreplaceable goods 

Requirements for SPDs 

•    The focus of Section 443 has moved from lightning to switching overvoltage 

•    The AQ criteria for determining if protection against transient overvoltage is needed are no longer included in BS 7671 

•    Instead, new Regulation 443.4 requires that protection against overvoltage is provided where overvoltage would result in:

-    Serious injury to, or loss of, human life 

-    Interruption of public services or damage to cultural heritage 

-    Interruption of commercial or industrial activity 

-    A large number of co-located individuals being affected

•    In all other cases, a risk assessment must be completed 

•    There is an exception to this risk assessment for single dwelling units where the value of the installation and equipment therein does not justify such protection – however, the cost of equipment at risk will far outweigh the cost of additional protection in virtually all instances 

Requirements for fire-resistant supports 

•    Regulation 521.11.201, which requires wiring systems to be supported against premature collapse in the event of a fire, has been extended 

•    It now requires fire resistant supports to be used throughout the installation and not just in escape routes 

Energy efficiency advisory notes 

•    A new appendix provides recommendations for optimising the overall efficient use of electricity in the design and erection of electrical installations

  • Unlock more on the 18th Edition

    Free and available to all electricians, mySchneider Electrician portal gives you access to further 18th Edition content including webinars, online training modules, detail on surge protection and more.

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