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Free webinar – RCDs: Selection, Types and Testing

On 1st December 2020, our Managing Director, Graham Kenyon, is presenting of the topic of Selection and types of RCDs, as part of the IET Webinar RCDs: Selection, Types and Testing. John Peckham, of Astute Technical Services Limited, is providing a presentation on RCD Testing. The event will be hosted by Colin Penfold, of the Operations department of Defra, and Colin, John and Graham will be answering live questions raised during the Webinar.

Did you miss this, or won’t be available at the stated time? Don’t worry – simply register now to view after the event!

Further information and registration for this event can be found here

Title: RCDs: Selection, Types and Testing
Date: Tuesday 1st December 2020
Time: 3 pm BST, 7 am USA PST, 10 am USA EST
Duration: 1 hour 30 minutes

IET Wiring Matters Article on the 4th Edition EV Code of Practice

Our Managing Director, Graham Kenyon, has prepared an article for the latest Issue 80 – May 2020 – of the IET’s Wiring Matters industry publication. looking at the the key changes in the 4th Edition of the IET Code of Practice for Electric Vehicle Charging Equipment Installation.

As Graham is the technical author of the publication, the article provides a unique perspective on the technical aspects.

Read the article here

The online course for EV charging equipment installation has also been updated to reflect the 4th Edition of the IET Code of Practice, and Amendment 1 (2020) to BS 7671:2018.

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.

G Kenyon Technology Ltd is not responsible for the contents of other sites linked from this page

December 2018 Corrigendum available for BS 7671:2018

IET publishes Corrigendum for the 18th Edition

The IET have today (20 December 2018) published a Corridengum to BS 7671:2018 (IET Wiring Regulations 18th Edition).

To download the Corrigendum, please visit the IET’s dedicated BS 7671 web page.

G Kenyon Technology Ltd are not responsible for the contents of web-sites linked from this post

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.

RCD protection for socket-outlets in the 18th Edition (BS 7671:2018)

(c) IET anbd BSI

Image from IET web-site

The publication of the 18th Edition of the IET WIring Regulations (forthcoming BS 7671:2018) is imminent, and BSI and the IET have publicised some of the key changes, which can be viewed on the IET web-site.

When Amendment No. 3 to BS 7671:2008 was published in 2015, we reported on changes to RCD protection for socket-outlets in Regulation 411.3.3, with socket-outlets in AC systems rated up to and including 20 A requiring RCD protection unless a risk assessment stated otherwise.

With the 18th Edition, Regulation 411.3.3 requires all socket-outlets in AC systems rated up to and including 32 A to be protected by a 30 mA RCD, the only exception being for installations other than in dwellings, where a documented risk assessment determines RCD protection is not necessary.

The salient facts here for Regulation 411.3.3 that designers will be obliged to consider are:

  1. The upper rating for socket-outlets requiring RCD protection in accordance with Regulation 411.3.3 has increased from 20 A to 32 A.
  2. There is no longer an exception to Regulation 411.3.3 for dwellings, regardless of whether a risk assessment was in place, and regardless of the appliance(s) to be served. An AC appliance that is not compatible with 30 mA RCDs in dwellings must therefore be permanently connected to the electrical installation, unless it is rated for use with a socket-outlet exceeding 32 A.
  3. If an exception is made in installations other than dwellings, to omit RCD protection for socket-outlets rated at 32 A or less, there must be a documented risk assessment that determines RCD protection is not necessary.
G Kenyon Technology Ltd is not responsible for the content of other web-sites linked from this article.

 

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.