Electric Vehicle Charging - Unit 11: Where it might be possible to use TN-C-S to supply charge points
This Unit examines in detail the special cases where the charging equipment may be connected to a PME (TN-C-S) earthing terminal. It covers requirements for indoor locations, provides example calculations for neutral imbalance and supplementary earth electrode resistance, and discusses how the voltage operated device described in Regulation 722.411.4.1 (iii) should be installed when they become available.
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• The occasions when EV charging equipment can be connected to a TN-C-S (PME) earthing system
• The requirements for charging points intended for charging vehicles indoors only
• Calculations required to assess whether a three-phase system is sufficiently well balanced to meet BS 7671 Regulation 722.411.4.1 (i)
• Calculations to determine the minimum earth electrode resistance required for supplementary earth electrode(s) provided to meet BS 7671 Regulation 722.411.4.1 (ii)
• The limitations for a voltage operated device described in Regulation 722.411.4.1 (iii)
Director and Principal Consultant at G Kenyon Technology Ltd, Graham has established his reputation designing and implementing control and information management systems in the challenging environments presented by world-class construction programmes in the airport and railway industries.
Graham is well versed in standard-setting, as he serves as: Chair of the IET’s Wiring Regulations Policy Committee; a member CIBSE’s Electrical Services Group Committee; an IET representative on JPEL/64 (BS 7671, IET Wiring Regulations), under which he also serves as Deputy Chair of JPEL/64 sub-committee D.
Graham is author of the 3rd Edition of the IET Code of Practice for Electric Vehicle Charging Installations, co-author of the IET Code of Practice for Electrical Energy Storage Systems, and editor of some of the IET’s forthcoming Wiring Regulations publications: Guidance Note 5 Protection against electric shock (8th Edition); Guidance Note 6 Protection against overcurrent (8th Edition); and Electrical installation design guide (4th Edition).