This post highlights the changes made to BS7671:2018 that were introduced by Amendment 1: 2020. For more information and training relating to ‘Electric Vehicle Charging Installations’ or any electrical installation training matters please feel free to contact us…
Introduction…
Amendment 1 has been introduced this year to amend Section 722 of BS7671:2018 ‘Electric Vehicle Charging Installations’
It was released on 1st February 2020 and may be implemented from this date onwards. Note: All electric vehicle charging installations commenced after the 31st July 2020 will need to comply with Amendment 1: 2020.
Effects of Amendment 1 on other parts of BS7671:2018…
Within Part 2 Definitions there are no changes to the definitions relating to ‘Electric Vehicle’ on pages 28 and 29.
New symbols have been introduced (see course handout)…
Section 722 Electric Vehicle Charging Installations
Apart from a couple of minor things there’s only really changes to two sets of regulations within Section 722…
* 722.411.4.1
This regulation relates to the methods that should be employed when the installation contains a PME earthing facility (i.e. TN-C-S).
Firstly, and probably the most common method employed is described in point (ii) which has no changes, except that it now says NOTE 3 instead of just NOTE.
Two additional new methods are described in points (iv) and (v) as well as their associated NOTES 4, 5 and 6.
* 722.53 Protection, isolation, switching, control and monitoring
722.531.2 and its associated regulations concerning RCDs have gone and have been replaced by…
* 722.531.3 Residual current devices (RCDs).
This regulation contains much of the information within the previous 722.531.2 as well as additional information regarding the requirement for 30mA RCD protection including the types of RCD used for the charging points.
NOTE: This regulation won’t apply if the circuit supplying the charging point is fed via an isolating transformer ‘i.e. electrical separation’.
Annex A722 (Informative)
Guidance for TN systems where PME conditions apply
A722.3 ‘Earth electrode resistance’. NOTES 2 and 3 have been added which are taken from previous A722.4 Notes 1 and 2.
A722.4 the symbols used in the Annex have been moved to ‘Symbols in Part 2’ and it has been rewritten. A722.4 now provides guidance on monitoring devices described in Regulation 722.411.4.1 (iii)
Fig A722. This diagram and description have also been added as an ‘Example of a separated system where protective conductor current monitoring is required’.
Finally, there is a list of British Standards at the end of the A1 document showing those BS numbers which are referenced within Amendment 1