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Fourth Edition of the EV Code of Practice now available

The 4th Edition of the IET Code of Practice for Electric Vehicle Charging Equipment Installation is now available. Our Managing Director, who is the lead author of the publication, provides a commentary on the key changes and new information.

The 4th Edition, available from the IET, is updated to BS 7671:2018 + A1:2020, and also includes:

  • guidance for on street installations updated to cover a wide range of situations
  • new information on load unbalance in three-phase installations
  • guidance on the selection and use of new open-PEN detection
  • guidance on the dangers associated with TT islands, and safe separation distances below ground for earth electrodes
  • Amendment 1 (2020) to BS 7671:2018 in its entirety

Open PEN detection where PME conditions apply

Regulation 722.411.4.1 (iii), (iv) and (v) permit the use of protective devices which detect open-circuit protective earth and neutral (PEN) conductors in the PME supply.

These devices are relatively new, and there are no product-specific standards available at present. The 4th Edition provides the guidance that installers need to select and install these new protective devices.

The device described in 722.411.4.1 (iv) is only suitable for installations with single-phase supplies, and should not be used for single-phase charging equipment in a three-phase installation. An important feature of the wording in 722.411.4.1 (iii) and (iv) is that the devices shall not be capable of re-closing onto the conditions they detect are hazardous. In order to provide equivalent safety, a device described in 722.411.4.1 (v) must also have the same feature.

A new approach to phase unbalance in three-phase systems

Our Managing Director has developed a new approach to determining whether exception (i) to Regulation722.411.4.1 applies in a three-phase system. This method removes the need for calculations using the formulas in Annex 722, A722.1 and A722.2, and relies only on knowledge of the worst-case unbalance conditions, and either use of a lookup table, or application of a rule-of-thumb.

This method is described fully in Annex J of the IET Code of Practice for EV Charging Equipment Installation 4th Edition.

Updated guidance on deriving a TT earthing arrangement from a TN supply

Unsafe installation practices have been observed where a separate TT supply is used for electric vehicle charging equipment. Further, this approach may not offer any benefit at all in small curtilage properties, such as a common semi-detached dwelling.

New and extended guidance is now included, to help designers and installers:

  • determine when it is unsafe to employ a TT earthing arrangement in installations with TN supply earthing arrangements
  • understand the risks associated with driving electrodes
  • ensure adequate separation distances below ground, between exposed-conductive-parts connected to different earthing arrangements
  • ensure an adequate separation distance below ground between the TT earth electrode, and buried conductive parts connected to the TN earthing arrangement, and understand that in certain cases, distribution network operators require a greater separation distance

Other new or revised guidance

There is an update to the section on Vehicle as storage, including new material by Dr Andrew Crossland and Mark Collins of Advance Further Energy, and new arrangements for installation of EVSE in prosuming installations by our Managing Director. The section on Integration and smart infrastructure has also been updated to include new material from Cameron Steel of Silver EMS.

The DNO notification process has been updated, and guidance is now included on earthing arrangements for the installation of Mode 4 (DC rapid charging) EVSE, some of which employs isolation between the AC source and the DC vehicle charging supply.

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7 January 2018 Principal Speaking at Seminar BS 7671:2018 18th Edition of the IET Wiring Regulations Interpreted by the experts

Hear about key changes being introduced in 18th Edition, from key committee experts.

BS 7671:2018 Requirements for Electrical Installations should be used for new designs from 1 January 2019. If you’ve been wondering what has changed and what you might need to do differently, attending this update seminar just four days later will give you the answers.

The three experts have active roles in the JPEL/64 committee led approach to the IET Wiring Regulations, so are well-placed to interpret the new edition and explain how it impacts the way you work.

Benefit from the discussion encouraged throughout the day, with plenty of time for delegates to question what, why and how with our panel as well as other delegates. You won’t get such comprehensive clarification by reading articles or sifting through the Regs themselves.

7 January 2019 IET London: Savoy Place

John Bradley, Chair, JPEL/64 – Electrical Installations
Mark Coles, Head of Technical Regulations, IET and Secretary, JPEL/64 Sub-Committee D – External Influences
Graham Kenyon, Chair IET WRPC, Chair JPEL/64 Sub-Committee D – External Influences
View the full programme >
Notes:
1. The content of this post was provided as an IET mailshot in March 2018.
2. G Kenyon Technology Ltd cannot be held responsible for the content of external web-sites linked from this post.

BS 7671:2018 18th Edition of the IET Wiring Regulations Interpreted by the experts

Hear about key changes being introduced in 18th Edition, from key committee experts.

BS 7671:2018 Requirements for Electrical Installations was issued on 2 July 2018. If you’ve been wondering what has changed and what you might need to do differently, attending this update seminar just four days later will give you the answers. A further date has now been added, 7 January 2019 at the IET, Savoy Place, London.

The three experts have active roles in the JPEL/64 committee led approach to the IET Wiring Regulations, so are well-placed to interpret the new edition and explain how it impacts the way you work.

Benefit from the discussion encouraged throughout the day, with plenty of time for delegates to question what, why and how with our panel as well as other delegates. You won’t get such comprehensive clarification by reading articles or sifting through the Regs themselves…
5 July 2018 IET Birmingham: Austin Court (bookings closed)
7 January 2019 IET London: Savoy Place

John Bradley, Chair, JPEL/64 – Electrical Installations
Mark Coles, Head of Technical Regulations, IET and Secretary, JPEL/64 Sub-Committee D – External Influences
Graham Kenyon, Chair IET WRPC, Deputy Chair JPEL/64 Sub-Committee D – External Influences
View the full programme >
Notes:
1. The content of this post was provided as an IET mailshot in March 2018.
2. G Kenyon Technology Ltd cannot be held responsible for the content of external web-sites linked from this post.