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18th Edition of BS7671 Wiring Regulations


A few weeks ago Electacourse went to NICEIC LiveSouth and heard Mark Coles of the IET talk about the 18th Edition of BS7671 Wiring Regulations.

When is the 18th Edition coming?

What we know so far about the 18th Edition Regulations is that the current anticipated publication date is July 2018. Electacourse have a number of offers to help our 17th Edition customers who are thinking whether to do the 17th Edition Course now or wait for the still unconfirmed publication date of the 18th Edition. See the chart below.

What changes are likely?

Protection against overvoltages

Clause 443 is likely to be significantly revised. BS7671 is dependent on International (IEC) and European (CENELEC – more about this below) standards. Both IEC and CENELEC have published major updates concerning overvoltage.

It is likely protection against transient overvoltage will be significantly changed in BS7671. Protection would have to be provided where the consequences affect human life, public services and commercial/industrial activity. And in line with the general trend of electricians being required to understand and exercise risk assessment, assessment will need to be made of whether protection is required in light of the potential human and commercial consequences of no protection.

Protection against fire

Chapter 42 concerns protection and precautions relating to fire caused by electrical equipment. It seems likely that BS7671:2018 will include regulations concerning the installation of arc fault detection devices – in response to the fact that RCDs cannot detect series or parallel arcing – faults which do not result in leakage current to earth.

Section 753

Section 753 will be extended to include embedded electrical heating systems for surface heating. This will include de-icing and frost prevention systems. Major revisions will include regulations relating to the protection against the effects of overheating caused by electrical short-circuits in embedded units and relating to harmful influence between the heating system and other electrical and non-electrical installations.

Energy efficiency

This major new section will cover several energy efficient areas, such as electric vehicles, lighting, metering, cable losses, transformer losses, power-factor correction, and harmonics


The wiring regulations BS7671 are decided upon by the UK committee JPEL/64, more information about the working of JPEL/64 can be found on the Wiring Matters blog.

JPEL/64 is informed by the UK’s commitment to the International Electrotechnical Committee (IEC) and the European Committee for Electrotechnical Standardization (CENELEC). The relationships between BS761, IEC and CENELEC are well explained by Mark Coles, the Technical Regulations Manager at the IET in his blog – Mark Coles blog.

IEC and CENELEC have their own update schedules. In addition to the likely BS7671 changes indicated above there will be many other smaller changes arising from these other standard bodies which will find their way in to the 18th Edition – these will be in addition to updates originating from JPEL/64’s consideration of electrical installation practice and requirements and the laws applicable in the UK.

What about Brexit and how will that change the 18th Edition schedule?

CENELEC is a European organisation and has a membership of 33 European states (ie more than just the EU states). The consequences of Brexit and the withdrawal of the UK from the European Union should not affect the UK membership of CENELEC. There is no indication at present that Brexit will change the anticipated publication schedule of the 18th Edition for July 2018.

Upgrade to 18th Edition Course for Electacourse customers

Electacourse 17th Edition Course sign up date* Taken
2382-15 exam?
Our promise
Up to 1 year No Free upgrade to new 18th Edition Course
Up to 1 year Yes Free course material upgrade. 18th Edition exam at cost price
Up to 2 years No 60% discount on 18th Edition Course material only
Up to 2 years Yes 40% discount on 18th Edition Course material only
Over 2 years No 20% discount on new 18th Edition Course
Over 2 years Yes 15% discount on new 18th Edition Course
*Year = the number of years between the date you signed-up for Electacourse 17th Edition Course and date of release of 18th Edition


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