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18th Edition Mythbuster

Guide to the New 18th Edition Wiring Regulations

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www.cudis.co.uk<br />

Introduction<br />

<strong>18th</strong> <strong>Edition</strong> of the IET Wiring Regulations (BS7671:2018 Requirements for Electrical Installations) is now fully<br />

effective and installations designed after January 1st 2019 must comply with these requirements. The Regulations<br />

apply to the design, erection and verification of electrical installations, also additions and alterations to existing<br />

installations.<br />

In this guide we provide an overview of some of the changes including those regarding surge protection and RCD<br />

types. This information provided is no substitute for the BS7671:2018 regulations and designers & installers should<br />

follow the requirements & recommendations within the regulations.<br />

Low Voltage Assemblies (421.1.201)<br />

There has been no change in this regulation or any other regulation<br />

which results in the way consumer units and distribution boards are<br />

constructed. Within domestic/household premises, consumer units<br />

and similar switchgear assemblies shall comply with BS EN 61439-3<br />

(effective January 2016) and shall have their enclosure manufactured<br />

from non-combustible material or be enclosed in a cabinet or<br />

enclosure constructed of a non-combustible material.<br />

Integration of Devices and Components (536.4.203)<br />

In low voltage assemblies e.g. consumer units/distribution boards and incorporated devices/components shall<br />

only be declared suitable according to the manufacturer of the assembly. Essentially this means that you must<br />

use the board manufacturer’s approved control devices (MCBs, RCDs, etc). So, typically, the board and it’s<br />

component devices will come from the same manufacturer. Cudis only declare Cudis devices to be suitable for<br />

it’s boards. If a deviation from assembly manufacturer’s instructions is introduced then the person introducing the<br />

deviation becomes the manufacturer and takes on the corresponding obligations.<br />

Additional Requirements for Socket Outlets (411.3.3)<br />

Additional protection by use of a 30mA RCD is now required for all socket outlets with ratings up to and including<br />

32A and all domestic lighting circuits. Without exception, every socket outlet in a dwelling must have RCD<br />

protection. If the installation is not a dwelling and if RCD protection may not be desirable for certain applications<br />

(such as supply to a computer server), a documented risk assessment will be required to determine that RCD<br />

protection is not necessary.<br />

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