18TH EDITION AMENDMENT 1 TECHNICAL
TOOLBOX TALKS
Electric vehicle charging was one of the subjects due to be discussed at our Toolbox Talks. With the events now cancelled due to coronavirus, keep an eye out for the alternative methods in which we will deliver this information.
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253 V or less than 207 V rms v. An alternative device to options iii or iv above which does not result in a lesser degree of safety. Previously only options i, ii and iii were given but these were not likely to be used as the requirements are difficult to satisfy. However, manufacturers of EV charging equipment are now developing products which incorporate safety devices in the EV charging equipment and the two new options reflect this. Please note that with regard to using these options, the designer of the EV charging installation retains overall responsibility for establishing the safety of the installation. It is also highlighted that it may not
always be possible to achieve adequate separation distances between different earthing systems when using one of the five options, therefore connection to a TT earthing system may be an alternative option.
RCD protection Requirements for RCD protection of the charging point socket–outlets or vehicle connector and specific protection against DC fault current have also now been clarified. The requirements for RCD
protection refer to the EV charging point itself as opposed to the final circuit supplying the equipment. However, there may be other requirements for RCD protection such as for fault protection, if the
28 CABLEtalk APRIL/MAY 2020
Electric vehicles are becoming a popular choice for drivers
“Manufacturers are developing products which incorporate safety devices in the charging equipment”
circuit were connected to a TT earthing arrangement. If this is the case, it is important to select the correct type of RCD and to ensure selectivity upstream from the charging equipment RCD. Regulation 722.531.2.101 requires the charging point to be protected by its own RCD having a residual operating current not exceeding 30mA, unless electrical separation is used. This should also protect against DC currents, except where this protection is provided by the charging point, and be either Type B or Type A or F in conjunction with a residual current detecting device (RDC-DD).
Annex A722 Guidance given in Annex A722 for TN systems where PME conditions apply
has been updated and includes sample calculations if adopting methods i, ii or iii for connection to a PME earthing system given in Regulation 722.411.4.1.
i
Businesses who want to become involved in this area of work may be interested in SELECT’s Electric Vehicle
Charging Equipment Installation training course (City & Guilds 2919-01-02). However, it should be noted that those
who are seeking to become an Approved Installer with OLEV may also need to undertake additional manufacturer product-specific training. For further information, please contact
SELECT Training on 0131 445 5577 or email
training@select.org.uk
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