18th Edition BS7671:2018+ Amendment 2:2022

Amendment 2 And The Design And Installation Of Residential Consumer Units

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Your Lewden 18th edition
Amendment 2 guide
Your guide to AFDDs

Amendment 2 of the Eighteenth edition of the IET Wiring Regulations (BS7671:2018+A2:2022), came into effect on 28th March 2022 and may be implemented immediately.

Amendment 1 (BS7671:2018+A2:2022) remains current until its withdrawal on 27th September 2022.

Amendment 2 Release

The release of Amendment 2 has introduced some fundamental changes which impact on the design and installation of a Residential Consumer Unit.

The document which you can download below sets out to identify and review the key areas affected by the new amendments, as follows:

Arc Fault Detection Devices (AFDD’s)

Regulation 421.1.7

Within Certain types of premises, protection against arcing faults is now mandatory requirement for final circuits rated up to 32A supplying socket outlet’s. For all other premises, the use of AFDDs on final circuits rate up to 32A Supplying socket outlets is recommended.

Find out more here

We also have a Lewden Guide to our P4 Series combined AFDD & RCBO, which can be downloaded for free here

You can view our range of AFDDs here

Surge Protection Devices

Section 443

Significant changes to 443.5 have resulted in the calculated risk assessment method for determining the requirement for SPD protection being deleted. Surge protection against indirect lighting strikes is now mandatory where consequences could result in injury or loss of life, loss of safety services, or financial or data loss. In all other cases, protection against indirect lighting strikes shall always be provided, unless the owner of the installation declares that it is not required due to any loss being accepted and tolerable.

Find out more here

You can view our range of Surge Protection Devices here

Residual Current Devices (RCDs)

Section 531.3.2

A new clause 531.3.2 (ii) reinforces the use of RCBOs in residential premises as a specific consideration for limiting the risk of unwanted tripping in final circuits

Type AC RCDs are now only permitted for use on circuits serving fixed equipment where it is known that the load current cannot generate any dc component, for example electric heating appliances or simple filament lighting

Find out more here

View our range of RCDs and RCBOs here

RCD Testing

Section 643

Amendments to clauses 643.7 & 643.8 have simplified the requirements for testing RCDs within an installation irrespective of RCD type (excluding time delayed RCDs), testing is now only required to be conducted using an alternating test current (AC) at rated residual operating current.

Find out more here

Want to see our full summary on this and many more changes relating to the design and installation of residential consumer units?

Download our full guide here!

Your Lewden AMD2 Guide

Download Here
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