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Code of Practice Electric Vehicle Charging Equipment Installation 4th Edition 2020 (PDF)

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About the book

4th Edition 2020
Pages: 189
Publisher: The Institution of Engineering and Technology
Language: English;

Electric vehicles have an important role to play in meeting air quality legislation and the UK's commitment to climate change targets. For these reasons, the UK government is actively supporting the switch to electric vehicles.
For many users, with the increase in battery size of electric vehicles, considerably more energy can be stored than the average daily commute requires.

A large electric vehicle parking facility creates a major opportunity to provide battery storage capacity to the electricity system, mitigating the intermittence of renewable generation and network constraints.

Other users need a larger range over which a vehicle can travel on a single charge, with a shorter time taken to recharge the vehicle.

A greater range requires a larger battery pack, increasing the time taken to recharge the battery using a standard BS 1363 type socket-outlet. To address this issue, vehicle manufacturers have worked with the electrical industry to develop suitable solutions.

The solutions that have been developed involve dedicated electric vehicle charging equipment using dedicated socket-outlets, plugs and vehicle connectors.

They also provide additional safety by requiring communication between the vehicle and the charging equipment before charging can commence. Two conductive charging solutions are now widely supported by the automotive industry:

(a) AC charging using the vehicle on-board charger, and (b) DC charging using external chargers provided by the electric vehicle supply equipment (EVSE).

This Code of Practice has been amended to include the requirements of BS 7671: 2018+A1 2020 Requirements for Electrical Installations, and includes:
(a) guidance on the selection and installation of open protective earthed-neutral (PEN) detection devices, according to the revised Regulation 722.411.4.1. This includes devices that operate when the voltage between the circuit protective conductor (cpc) and Earth exceeds 70 v rms, with or without a measurement earth electrode (722.411.4.1 (iii)), as well as devices for single-phase installations only that operate when the line to neutral voltage is outside certain limits (722.411.4.1 (iv)).

(b) updated guidance on the selection and installation of residual current devices (RCDs) and residual DC current disconnecting devices (RDC-DDs), according to the revised Regulation 722.531.3.101.
(c) Chapter 10 (Vehicle as storage) and Chapter 12 (Integration and smart infrastructure) have been extensively updated, and include new content to assist designers and installers.
(d) Chapter 11 (Distribution network operator (DNO) notification) has been updated to reflect the latest notification process.
(e) new Annexes have been included, based on research conducted by the author and members of the lET Wiring Regulations Policy Committee, as follows:
(i) Annex H provides guidance on the transfer of potential between buried conductors and earth electrodes in earthing systems for electric vehicle (EV) charging points, which is important in the selection of a suitable location for TT earth electrodes;
(ii) Annex I provides guidance on the detection threshold voltage, and location of a measurement earth electrode, for open PEN detection devices described in Regulation 722.411.4.1 (iii), and
(iii) Annex J provides guidance on the use of protective multiple earthing (PME) earthing terminals in three-phase systems that are sufficiently well-balanced according to Regulation 722.411.4.1 (ii). A rule of thumb and look-up table are provided to avoid lengthy calculations.


1 Scope
2 Overview of EV charging equipment
3 Arrangements prior to installation commencement
4 Physical installation requirements
5 Electrical requirements - General
6 Electrical requirements - Dwelling installations
7 Electrical requirements - On-street installations
8 Electrical requirements - Commercial and industrial installations
9 Inspection, testing and maintenance requirements
10 Vehicle as storage
11 Distribution network operator (DNO) notification
12 Integration and smart infrastructure
Annex A - Charging connectors and charging cable types
Annex B - Checklists for dwelling installations
Annex C - Checklists for on-street installations
Annex D - Checklists for commercial and industrial installations
Annex E - Checklists for fuel filling station installations
Annex F - Wireless power transfer (WPT) installations
Annex G - Installing an earth electrode system to enable use of a PME supply earth, in accordance with Regulation 122.411.4.1 (ii) of BS 7671
Annex H - Separation of earth electrode zones where TT is used, and installation of electrodes
Annex I - Determining a suitable location and voltage tripping threshold for a measurement earth electrode if used for compliance with Regulation 122.411.4.1 (iii) of BS 7671
Annex J - A rule of thumb for three-phase system balance in accordance with Regulation 722.411.4.1 (i) of BS 7671
Annex K - Supply and earthing arrangements for Mode 4 DC EVSE
Annex L - Requirements for Electrical Installations BS 7671:2018 Amendment 1:2020
Annex M - Glossary
Annex N - Figures and Tables
Annex 0 - References

Tags: Code of Practice Electric Vehicle, Code of Practice Charging Equipment, Code of Practice Vehicle Charging

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