Bs 7671 2018 - A1 - 2020 Inc Corrigendum May 2020 - Read Only PDF
Bs 7671 2018 - A1 - 2020 Inc Corrigendum May 2020 - Read Only PDF
Bs 7671 2018 - A1 - 2020 Inc Corrigendum May 2020 - Read Only PDF
Requirements for
Electrical Installations
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Eighteenth Edition
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Publication Information
Published by the Institution of Engineering and Technology, London, United Kingdom in agreement with BSI.
The Institution of Engineering and Technology is registered as a Charity in England & Wales (no. 211014) and
Scotland (no. SC038698).
The Institution of Engineering and Technology is the institution formed in 2006 by
the joining together of the IEE (the Institution of Electrical Engineers) and the IIE
(the Institution of Incorporated Engineers).
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© 2008, 2011, 2013, 2015, 2018, 2020 the Institution of Engineering and Technology and BSI
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This British Standard was published under the joint authority of the IET and of the Standards Policy and Strategy
Committee on 1 July 2018.
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This publication is copyright under the Berne Convention and the Universal Copyright Convention. All rights
reserved. Apart from any fair dealing for the purposes of research or private study, or criticism or review, as permitted
under the Copyright, Designs and Patents Act 1988 this publication may be reproduced, stored or transmitted, in
any form or by any means, only with the prior permission in writing of the publishers, or in the case of reprographic
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reproduction in accordance with the terms of licences issued by the Copyright Licensing Agency. Enquiries
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concerning reproduction outside those terms should be sent to the publishers at The Institution of Engineering and
Technology, Michael Faraday House, Six Hills Way, Stevenage, SG1 2AY, United Kingdom
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While the publisher and contributors believe that the information and guidance given in this work is correct, all
parties must rely upon their own skill and judgement when making use of it. The publisher and contributors do not
assume any liability to anyone for any loss or damage caused by any error or omission in the work, whether such
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error or omission is the result of negligence or any other cause. Any and all such liability is disclaimed.
The UK participation in its preparation was entrusted to Joint Technical Committee JPEL/64 Electrical Installations.
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A list of organizations represented on this committee can be obtained on request to its secretary.
This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
correct application. Compliance with a British Standard cannot confer immunity from legal obligations.
The IET is taking the issues found with dangerous counterfeits of its titles very seriously. For
information on counterfeits, the hologram and how to identify genuine IET publications, visit :
https://electrical.theiet.org/bs-7671/fake-awareness/
It is the constant aim of the IET and BSI to improve the quality of our products and services. We should be grateful
if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary,
G D Cronshaw {gcronshaw@theiet.org}, The IET, Six Hills Way, Stevenage, SG1 2AY, United Kingdom.
CONTENTS
FOREWORD 4
EDITIONS 5
PREFACE 5
PART 2 DEFINITIONS 7
D O Y
SYMBOLS USED IN THE STANDARD 8
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SECTION 722 ELECTRIC VEHICLE CHARGING INSTALLATIONS 9
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ANNEX A722 GUIDANCE FOR TN SYSTEMS WHERE PME CONDITIONS APPLY 13
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APPENDIX 1 (Normative) BRITISH STANDARDS TO WHICH
REFERENCE IS MADE IN THIS STANDARD 15
INDEX
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Foreword
This British Standard is published under the direction of the British Electrotechnical Committee (BEC) and
the Institution of Engineering and Technology (IET).
Following a full review, this Standard replaced the 17th Edition of the IEE Wiring Regulations BS 7671:2008
as amended. Copyright is held jointly by the IET and BSI.
Technical authority for this Standard is vested in the Joint IET/BSI Technical Committee JPEL/64. This Joint
Technical Committee, which is responsible for the work previously undertaken by the IEE Wiring Regulations
Committee and the BSI Technical Committee PEL/64, meets the constitutional and operational requirements of both
parent bodies. JPEL/64 has the responsibility for the content of this British Standard under the joint authority of
the IET and the BSI Standards Board.
All references in this text to the Wiring Regulations or the Regulation(s), where not otherwise specifically
identified, shall be taken to refer to BS 7671:2018 Requirements for Electrical Installations as amended by
Amendment 1, 2020.
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Additions or alterations to regulations owing to the issue of BS 7671:2018 are indicated by a side bar in the margin.
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Amendment 1:2020 to BS 7671:2018 Requirements for Electrical Installations was issued on 1st February 2020
and may be implemented immediately. Electrical installations falling within the scope of Section 722, the erection
of which is commenced after 31st July 2020, are to comply with BS 7671:2018 incorporating Amendment 1:2020.
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Amendment 1:2020 amends Section 722 Electric Vehicle Charging Installations.
Part 2
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Definitions relating to Section 722 have been included.
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Section 722
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against electric shock, and includes specific requirements with regard to PME systems, socket-outlets and connectors,
external influences, isolation and switching and RCD protection.
Regulation 722.411.4.1 adds indent (iv) which adds an alternative solution requirement for charging installations.
The requirements of this section do not apply to wireless charging, such as inductive charging.
Appendix 1
References to British Standards for Section 722 have been included.
Index
Entries for Section 722 have been included.
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Editions
EIGHTEENTH EDITION BS 7671:2018 issued, July 2018. (Blue Cover)
Amendment 1 issued, February 2020 (electronic)
Preface
BS 7671 Requirements for Electrical Installations takes account of the technical substance of agreements
reached in CENELEC. In particular, the technical intent of the following CENELEC Harmonization Document is
included:
D O Y
Where the above document contains UK special national conditions, those conditions have been incorporated within
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BS 7671. If BS 7671 is applied in other countries the above document should be consulted to confirm the status of
a particular regulation.
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BS 7671 will continue to be amended from time to time to take account of the publication of new or amended
CENELEC and IEC standards. The opportunity has been taken to revise regulations that experience has shown
require clarification or to allow for new technology and methods.
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Reference is made throughout BS 7671 to publications of the British Standards Institution, both specifications and
codes of practice. Appendix 1 lists these publications and gives their full titles whereas throughout BS 7671 they
are referred to only by their numbers.
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Where reference is made in BS 7671 to a British Standard which takes account of a CENELEC Harmonization
Document, European Norm (EN) or IEC standard, it is understood that the reference also relates to any European
national standard similarly derived from the CENELEC standard, although account needs to be taken of any national
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exemptions.
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The regulation numbering follows the pattern and corresponding references of IEC 60364. The numbering does
not, therefore, necessarily follow sequentially. The numbering system used in Part 7 is explained in Section 700.
In the numbering system used, the first digit signifies a Part, the second digit a Chapter, the third digit a Section and
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the subsequent digits the Regulation number. For example, Section number 413 is made up as follows:
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PART 4 - PROTECTION FOR SAFETY
Chapter 41 (first chapter of Part 4) - PROTECTION AGAINST ELECTRIC SHOCK
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Section 413 (third section of Chapter 41) - PROTECTIVE MEASURE: ELECTRICAL SEPARATION
Part 1 sets out the scope, object and fundamental principles.
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Part 2 defines the sense in which certain terms are used throughout the Regulations, and provides a list of
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Part Subject
Part 3 Identification of the characteristics of the installation that will need to be taken into account in
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choosing and applying the requirements of the subsequent Parts. These characteristics may vary
from one part of an installation to another and should be assessed for each location to be served by
the installation.
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Part 4 Description of the measures that are available for the protection of persons, livestock and property,
and against the hazards that may arise from the use of electricity.
Part 5 Precautions to be taken in the selection and erection of the equipment of the installation.
Part 6 Inspection and testing.
Part 7 Special installations or locations - particular requirements.
The sequence of the plan should be followed in considering the application of any particular requirement of the
Regulations. The general index provides a ready reference to particular regulations by subject, but in applying any
one regulation the requirements of related regulations should be borne in mind. Cross-references are provided, and
the index is arranged to facilitate this.
In many cases, a group of associated regulations is covered by a side heading which is identified by a two-part
number, e.g. 544.2. Throughout the Regulations where reference is made to such a two-part number, that reference
is to be taken to include all the individual regulation numbers which are covered by that side heading and include
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Part 2
DEFINITIONS
Electric vehicle (EV), {722}. Any vehicle propelled by an electric motor drawing current from a rechargeable
storage battery or from other portable energy storage devices (rechargeable, using energy from a source off the
vehicle such as a residential or public electricity service), which is manufactured primarily for use on public streets,
roads or highways.
• Charging equipment. An assembly including one or more charging points.
• Electric vehicle charging point. The point where the electric vehicle is connected to the fixed installation.
NOTE: The charging point is a socket-outlet where the charging cable belongs to the vehicle, or a connector, where
the charging cable is a fixed part of the electric vehicle supply equipment.
• Mode 1 charging. Connection of the EV to the AC supply network utilizing standardized socket-outlets
not exceeding 16 A and not exceeding 250 V AC single-phase or 480 V AC three-phase, at the supply side,
D O Y
and utilizing the power and protective earth conductors (according to BS EN 61851-1).
• Mode 2 charging. Connection of the EV to the AC supply network utilizing standardized socket-outlets
O F L not exceeding 32 A and not exceeding 250 V AC single-phase or 480 V AC three-phase, at the supply side,
and utilizing the power and protective earth conductors together with a control pilot function and system
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of personnel protection against electric shock (RCD) between the EV and the plug or as part of the in-cable
control box.
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supply equipment where the control pilot function extends to control equipment in the electric vehicle
supply equipment, permanently connected to the AC supply network.
• Mode 4 charging. Connection of the EV to the AC supply network utilizing an off-board charger where
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the control pilot function extends to equipment permanently connected to the AC supply.
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• Vehicle connector. Part of a vehicle coupler integral with, or intended to be attached to, the flexible cable
connected to the AC supply network (mains).
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• Vehicle coupler. Means of enabling the manual connection of a flexible cable to an EV for the purpose
of charging.
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NOTE: A vehicle coupler consists of two parts: a vehicle connector and a vehicle inlet.
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D O Y
that of the electric vehicle charging load and
any other loads, determined in accordance with
Regulation 311.1
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PART 7
SPECIAL INSTALLATIONS OR LOCATIONS
CONTENTS
700 GENERAL
722 ELECTRIC VEHICLE CHARGING INSTALLATIONS
SECTION 700
D O Y
GENERAL
The particular requirements for each section (special installation or location) in Part 7 supplement or modify the
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general requirements contained in other parts of BS 7671.
The absence of reference to the exclusion of a part, a chapter, a section or a regulation means that the corresponding
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general regulations are applicable.
The number appearing after a section number generally refers to the corresponding chapter, section or regulation
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within Parts 1 to 6. The numbering does not, therefore, necessarily follow sequentially and new numbers have been
added as required. Numbering of figures and tables takes the number of the section followed by a sequential number.
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SECTION 722
ELECTRIC VEHICLE CHARGING INSTALLATIONS
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NOTE: Definitions relating to Section 722 can be found in Part 2 under electric vehicle (EV), {722}.
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722.1 Scope
The particular requirements of this section apply to circuits intended to supply electric vehicles for charging purposes.
The requirements of this section do not apply to electric vehicle charging points that:
(i) employ inductive charging
(ii) charge mobility scooters and similar vehicles of 10 A and less.
722.3 Assessment of general characteristics
722.311.201 Load curtailment, including load reduction or disconnection, either automatically or manually, may
be taken into account when determining maximum demand of the installation or part thereof.
722.312 Conductor arrangement and system earthing
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722.312.2.1 TN systems
A circuit supplying charging equipment for electric vehicles shall not include a PEN conductor.
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722.410.3.5 The protective measures of obstacles and placing out of reach (Section 417) shall not be used.
722.410.3.6 The protective measures of non-conducting location (Regulation 418.1) and earth-free local
equipotential bonding (Regulation 418.2) shall not be used.
722.411.4 TN system
722.411.4.1 A PME earthing facility shall not be used as the means of earthing for the protective conductor
contact of a charging point located outdoors or that might reasonably be expected to be used to charge a vehicle
located outdoors unless one of the following methods is used:
(i) The charging point forms part of a three-phase installation that also supplies loads other than for electric
D O Y
vehicle charging and, because of the characteristics of the load of the installation, the maximum voltage
between the main earthing terminal of the installation and Earth in the event of an open-circuit fault in the
PEN conductor of the low voltage network supplying the installation does not exceed 70 V rms.
O F L NOTE 1: Annex 722, item A722.2 gives some information relating to (i).
NOTE 2: See also Regulation 641.5 when undertaking an addition or alteration to an existing installation.
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(ii) The main earthing terminal of the installation is connected to an installation earth electrode by a protective
conductor complying with Regulation 544.1.1. The resistance of the earth electrode to Earth shall be such
that the maximum voltage between the main earthing terminal of the installation and Earth in the event of
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exceed 70 V rms.
NOTE 3: Annex 722, item A722.3 gives guidance on determining the maximum resistance required for the earth
electrode in (ii).
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(iii) Protection against electric shock is provided by a device which electrically disconnects the vehicle from
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the live conductors of the supply and from protective earth in accordance with Regulation 543.3.3.101(ii)
within 5 s in the event of the voltage between the circuit protective conductor and Earth exceeding 70 V rms
due to an open-circuit fault in the PEN conductor of the low voltage network. The device need not operate
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if the voltage exceeds 70 V rms for less than 4 s. The device shall provide isolation and be selected in
accordance with Table 537.4. Closing or resetting of the device shall be possible only if the voltage between
the circuit protective conductor and Earth does not exceed 70 V rms. Equivalent means of functionality
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(iv) Protection against electric shock in a single-phase installation is provided by a device which electrically
disconnects the vehicle from the live conductors of the supply and from protective earth in accordance with
Regulation 543.3.3.101(ii) within 5 s in the event of the utilisation voltage at the charging point, between
the line and neutral conductors, being greater than 253 V rms or less than 207 V rms. The device shall
provide isolation and be selected in accordance with Table 537.4. Equivalent means of functionality could
be included within the charging equipment. Closing or resetting of the device shall be possible only if the
voltage between line and neutral conductors is in the range 207 to 253 V rms.
(v) Protection against electric shock is provided by the use of an alternative device to those in (iii) or (iv) which
does not result in a lesser degree of safety than using (iii) or (iv). Equivalent means of functionality could be
included within the charging equipment. The device (or means of functionality) shall operate by electrically
disconnecting the vehicle from the live conductors of the supply and from protective earth in accordance
with Regulation 543.3.3.101(ii). It shall provide isolation and be selected in accordance with Table 537.4.
NOTE 5: See Section 511. BS 7671 does not deal with the safety requirements for the construction of electrical
equipment. Where equipment to be used is not covered by a British or Harmonized Standard or is to be used
outside the scope of its standard, it is the responsibility of the electrical installation designer or other person
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responsible for specifying the installation to establish that the manufacturer of the equipment has ensured that
the equipment satisfies the safety objectives of the relevant Directive(s), as it will not benefit from a
presumption of conformity afforded by the appropriate product standard.
Where buried in the ground, a protective conductor connected to an earth electrode for the purposes of (ii) or (iii)
shall have a cross-sectional area not less than that stated in Table 54.1.
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Protective conductors and exposed-conductive-parts downstream of a protective device provided for the purposes
of (iii), (iv) and (v) shall have no connection to:
(a) any protective conductors or exposed-conductive-parts of any circuit not protected by the same protective
device; or
(b) any extraneous-conductive-part.
NOTE 6: Creating a TT earthing system for charging equipment or the whole installation as an alternative to
using a PME earthing facility with one of methods (i) to (v) above may not be an appropriate
solution due to the inability to provide sufficient separation from buried metalwork connected to
the supply PEN conductor
722.413 Protective measure: Electrical separation
722.413.1.2 This protective measure shall be limited to the supply of one electric vehicle supplied from
one unearthed source. The circuit shall be supplied through a fixed isolating transformer complying with
BS EN 61558-2-4.
NOTE: An example of an arrangement for the supply of a Class I electric vehicle charging point from a separated source is
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shown in Annex A722, Item A722.5.
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722.511 Compliance with standards
722.511.1 Where an EV charging point is built into a low voltage switchgear or controlgear assembly the
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requirements of the relevant part of BS EN 61439 series shall apply.
722.511.101 EV charging equipment shall comply with the appropriate parts of the BS EN 61851
series.
722.512
Where installed outdoors, the equipment shall provide a degree of protection of at least IPX4.
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Where installed outdoors, the equipment shall provide a degree of protection of at least IP4X.
722.531 Devices for protection against electric shock by automatic disconnection of supply
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722.531.3.101 Unless supplied by a circuit using the protective measure of electrical separation, each charging
point incorporating a socket-outlet or vehicle connector complying with the BS EN 62196 series shall be protected
by an RCD having a rated residual operating current not exceeding 30 mA.
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Except where provided by the EV charging equipment, protection against DC fault currents shall be provided by:
(i) an RCD Type B, or
(ii) an RCD Type A or Type F in conjunction with a residual direct current detecting device (RDC-DD)
complying with BS IEC 62955 as appropriate to the nature of the residual and superimposed currents and
recommendation of the manufacturer of the charging equipment.
RCDs shall comply with one of the following standards: BS EN 61008-1, BS EN 61009-1, BS EN 60947-2 or
BS EN 62423.
NOTE 1: Types of RCD are described in Regulation 531.3.3 in respect of their behaviour when exposed to DC components and
frequencies.
NOTE 2: Requirements for the selection and erection of RCDs in the case of supplies using DC vehicle connectors according to
the BS EN 62196 series are under consideration.
NOTE 3: An RCD Type A or Type F in conjunction with an RDC-DD can be arranged with the RDC-DD inside the EV charging
equipment and the Type A or Type F RCD upstream in either the charging equipment or the installation.
D O Y
722.533 Devices for protection against overcurrent
722.533.101 Each charging point shall be supplied individually by a final circuit protected by an overcurrent
protective device complying with BS EN 60947-2, BS EN 60947-6-2 or BS EN 61009-1 or with the relevant parts
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of the BS EN 60898 series or the BS EN 60269 series.
NOTE: The electric vehicle charging equipment may have multiple charging points.
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722.55 Other equipment
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722.55.101 Socket-outlets and connectors
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722.55.101.0.201.1 Each AC charging point shall incorporate:
(i) one socket-outlet complying with BS 1363-2 marked ‘EV’ on its rear and, except where there is no possibility
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of confusion, a label shall be provided on the front face or adjacent to the socket-outlet or its enclosure
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(iii) one socket-outlet or connector complying with BS EN 60309-2 which is part of an interlocked self-contained
product complying with BS EN 60309-4 and classified to clauses 6.1.101 and 6.1.102 to prevent the socket
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only, or
(vi) one Type 3 socket-outlet or vehicle connector complying with BS EN 62196-2 for use with mode 3 charging
only.
NOTE: Vehicle manufacturers' instructions should be taken into account when determining the type of socket-outlet to be
installed.
722.55.101.0.201.2 Each socket-outlet shall be installed in a distribution board in accordance with Regulation
722.51 or in its appropriate enclosure (e.g. flush or surface mounted socket-outlet box) and mounted in a fixed
position.
Portable socket-outlets shall not be used but tethered vehicle connectors are permitted.
722.55.101.3 One socket-outlet or vehicle connector shall supply only one electric vehicle.
722.55.101.4In EV charging modes 3 and 4, an electrical or mechanical system shall be provided to prevent the
plugging/unplugging of the plug unless the socket-outlet or the vehicle connector has been switched off from the
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supply.
722.55.101.6 Precautions on supply of the fixed installation by the EV
NOTE: Requirements for precautions on supply of the fixed installation by the EV are under consideration.
722.551.7.2 The socket-outlet or vehicle connector shall comply with BS EN 62196 series.
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NOTE: The maximum neutral current (Im) occurs under conditions of maximum imbalance, not necessarily maximum overall
demand.
D O Y
Where triple harmonics can be neglected, condition (i) of Regulation 722.411.4.1 may be assumed to apply where
the following condition is met. This formula should take account of Cmax in line with PD CLC/TR 50480.
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A722.3 Earth electrode resistance
For the purposes of condition (ii) of Regulation 722.411.4.1, the sum of the resistances of the earth electrode and the
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protective conductor connecting it to the main earthing terminal must meet the following condition, as applicable.
For a single-phase installation:
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70(Iu+IL2+IL3)
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NOTE 1: The above three-phase formula for RA ev is valid only where Im > UoCmax . Where this is not the case,
this indicates that condition (i) of Regulation 722.411.4.1 applies and that an earth electrode is not required for the
purposes of condition (ii) of that regulation.
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NOTE 2: The above currents and voltage are magnitudes only; they are not phasors.
NOTE 3: In determining Im, IL1, IL2 and IL3, allowance must be made for single-phase vehicles being charged from three-phase
charging points.
(a) the circuit protective conductor and a suitable measurement earth electrode, or
(b) the circuit protective conductor and a reference point derived from the line conductors of a three-phase
system, provided that suitable precautions are also taken to disconnect the device when the supply to one or
more-line conductors is interrupted.
Where used, measurement earth electrodes should be located at a sufficient distance from other earth electrodes
and/or other buried exposed-conductive-parts and/or extraneous-conductive-parts connected to the PME earthing
terminal to reduce transfer of earth potential rise on the PME system during a PEN failure.
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Applying Clauses 9.6.1 and 9.6.2 of BS 7430:2011+A1:2015, in conditions where only buried exposed- and/or
extraneous-conductive-parts equivalent to vertical and horizontal earth electrodes are being considered, a separation
distance of at least 8 m reduces the voltage transfer from the PME earthing system to less than 20 % and, in these
conditions, the voltage operated device should be arranged to operate at 56 V.
It is recommended that the minimum separation distance is 2 m, and at this separation distance the device should be
arranged to operate at 40 V.
Where other types of earth electrodes are used, separation distances should be increased, or the operating voltage
decreased, accordingly, using the guidance in BS 7430.
To protect a person touching the body of an electric vehicle, connected to the charging point, when an open-
circuit fault occurs in the PEN conductor of the supply, an enhanced safety provision may be offered. This may
be achieved by a device that provides shorter disconnection times, depending on the detected voltage between the
circuit protective conductor and Earth but also taking into account the need to limit the risk of unwanted tripping.
Examples of shorter disconnection times are shown in Table A722 below. These disconnection times are based on
IEC Technical Report IEC TR 60479-5 and also on comparable requirements already included in Chapter 41 of
D O Y
BS 7671.
TABLE A722 – Maximum disconnection times in relation to the voltage between the circuit
O F L protective conductor and Earth*
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1s 0.7 s 0.2 s 0.04 s
*
Total voltage drop across the sensing element of the device and the earth electrode (if any) in series.
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A722.5 Example arrangement of a separated system described in Regulation 722.413
An example arrangement of a separated system as described in Regulation 722.413 is shown in Figure A722.
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Isolating transformers may have high inrush currents, and overcurrent protective devices in the primary circuit
should be selected accordingly to prevent nuisance-tripping.
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Fig A722 – Example of a separated system where protective conductor monitoring is required
Supply RCD 30 mA RCD
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(Note 1)
L L
R
Overcurrent Overcurrent
protective protective
device device
TN-C-S To electrical
(PM E) vehicle
Supply charging point
(Note 2)
N N
PE PC
Key
L line conductor
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N neutral conductor
PE protective earthing conductor
PC protective conductor
NOTE 1: The RCD on the secondary, complying with Regulation 722.531.3.101, should be placed as close as possible to the
transformer.
NOTE 2: Only one charging point may be supplied by each transformer, see Regulation 722.413.1.2.
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APPENDIX 1 (Normative)
BRITISH STANDARDS TO WHICH REFERENCE IS MADE IN THIS
STANDARD
NOTE: Certain British Standards have been withdrawn since the issue of the previous Edition. From the date of withdrawal,
certificates and marks already awarded may continue to apply to production until a date specified in the superseding
standard. During the period between these dates, the withdrawn standard may be specified in contracts. However, it
should be noted that this appendix may not list such standards, as only current British Standards are listed with some
references to superseded standards. Where standards are not dated they are a multiple standard.
D O Y
installations
BS EN 60269 series Low-voltage fuses 722.533.101
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BS EN 60309-1
BS EN 60309-2
Plugs, socket-outlets and couplers for industrial purposes –
General requirements
Plugs, socket-outlets and couplers for industrial purposes –
722.55.101.0.201.1(ii)
722.55.101.0.201.1(ii)
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Dimensional interchangeability requirements for pin and 722.55.101.0.201.1(iii)
contact-tube accessories
BS EN 60309-4 Plugs, socket-outlets and couplers for industrial purposes – Switched 722.55.101.0.201.1(iii)
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socket-outlets and connectors, with or without interlock
BS EN 60898 series Specification for circuit-breakers for overcurrent protection for house- 722.533.101
hold and similar installations
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BS EN 60947-2 Low-voltage switchgear and control gear – Circuit-breakers 722.531.3.101
722.533.101
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INDEX
The following entries are pertinent to Section 722:
E P
Electric vehicle (EV), definition Part 2 Protective multiple earthing (PME) -
Electric vehicle charging installations -- electric vehicle charging
- Sec 722 installations 722.411.4.1
-- application, scope of 722.1 R
-- charging point outdoors, IP rating 722.512.2.201
-- connectors 722.55.101 Residual current devices (RCDs) -
-- dedicated final circuit required 722.311 -- electric vehicle charging points 722.531.3.101
-- definitions relating to Part 2 EV
-- electrical separation, limitation on S
use of 722.413.1.2
-- external influences 722.512.2 Socket-outlets -
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-- load curtailment 722.311.201 -- electric vehicle charging 722.551.7.2
-- maximum demand 722.311
-- overcurrent protection 722.533.101
-- protective measures not permitted 722.410.3.5 & 6
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-- RCDs 722.531.3
-- RDC-DD 722.531.3.101
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-- selection and erection 722.5
-- socket-outlets for 722.55.101
-- TN system - 722.411.4
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-- PEN conductor prohibited in final
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circuit 722.312.2.1
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D O Y
Requirements for
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Electrical Installations
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Eighteenth Edition
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BS 7671:2018+A1:2020 ‐ Corrigendum (May 2020)
Please note the following corrections
SUMMARY OF CORRECTIONS
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4 13 A722.1 Incorrect equation.
5 13 A722.4 Incorrect Regulation number, 722.411.4 (iii) changed to
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6 16 Index
722.411.4.1 (iii).
Incorrect Regulation number, 722.311 changed to 722.533.101
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7 16 Index Addition of an entry to the Index.
8 16 Index Incorrect Regulation number, 722.551.7.2 changed to
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The corrections are shown in red on the following pages.
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722.410.3.5 The protective measures of obstacles and placing out of reach (Section 417) shall not be used.
722.410.3.6 The protective measures of non-conducting location (Regulation 418.1) and earth-free local
equipotential bonding (Regulation 418.2) shall not be used.
722.411.4 TN system
722.411.4.1 A PME earthing facility shall not be used as the means of earthing for the protective conductor
contact of a charging point located outdoors or that might reasonably be expected to be used to charge a vehicle
located outdoors unless one of the following methods is used:
(i) The charging point forms part of a three-phase installation that also supplies loads other than for electric
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vehicle charging and, because of the characteristics of the load of the installation, the maximum voltage
between the main earthing terminal of the installation and Earth in the event of an open-circuit fault in the
PEN conductor of the low voltage network supplying the installation does not exceed 70 V rms.
O F L NOTE 1: Annex 722, item A722.2 gives some information relating to (i).
NOTE 2: See also Regulation 641.5 when undertaking an addition or alteration to an existing installation.
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(ii) The main earthing terminal of the installation is connected to an installation earth electrode by a protective
conductor complying with Regulation 544.1.1. The resistance of the earth electrode to Earth shall be such
that the maximum voltage between the main earthing terminal of the installation and Earth in the event of
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exceed 70 V rms.
NOTE 3: Annex 722, item A722.3 gives guidance on determining the maximum resistance required for the earth
electrode in (ii).
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(iii) Protection against electric shock is provided by a device which electrically disconnects the vehicle from
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the live conductors of the supply and from protective earth in accordance with Regulation 543.3.3.101(ii)
within 5 s in the event of the voltage between the circuit protective conductor and Earth exceeding 70 V rms
due to an open-circuit fault in the PEN conductor of the low voltage network. The device need not operate
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if the voltage exceeds 70 V rms for less than 4 s. The device shall provide isolation and be selected in
accordance with Table 537.4. Closing or resetting of the device shall be possible only if the voltage between
the circuit protective conductor and Earth does not exceed 70 V rms. Equivalent means of functionality
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(iv) Protection against electric shock in a single-phase installation is provided by a device which electrically
disconnects the vehicle from the live conductors of the supply and from protective earth in accordance with
Regulation 543.3.3.101(ii) within 5 s in the event of the utilisation voltage at the charging point, between
the line and neutral conductors, being greater than 253 V rms or less than 207 V rms. The device shall
provide isolation and be selected in accordance with Table 537.4. Equivalent means of functionality could
be included within the charging equipment. Closing or resetting of the device shall be possible only if the
voltage between line and neutral conductors is in the range 207 to 253 V rms. See NOTE 5.
(v) Protection against electric shock is provided by the use of an alternative device to those in (iii) or (iv) which does
not result in a lesser degree of safety than using (iii) or (iv). Equivalent means of functionality could be included
within the charging equipment. The device (or means of functionality) shall operate by electrically disconnecting
the vehicle from the live conductors of the supply and from protective earth in accordance with Regulation
543.3.3.101(ii). It shall provide isolation and be selected in accordance with Table 537.4. See NOTE 5.
NOTE 5: See Section 511. BS 7671 does not deal with the safety requirements for the construction of electrical
equipment. Where equipment to be used is not covered by a British or Harmonized Standard or is to be used
outside the scope of its standard, it is the responsibility of the electrical installation designer or other person
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responsible for specifying the installation to establish that the manufacturer of the equipment has ensured that
the equipment satisfies the safety objectives of the relevant Directive(s), as it will not benefit from a
presumption of conformity afforded by the appropriate product standard.
NOTE 5: See Section 511. BS 7671 does not deal with the safety requirements for the construction of electrical equipment.
Where equipment to be used is not covered by a British or Harmonized Standard or is to be used outside the
scope of its standard, it is the responsibility of the electrical installation designer or other person responsible for
specifying the installation to establish that the manufacturer of the equipment has ensured that the equipment
satisfies the safety objectives of the relevant Directive(s), as it will not benefit from a presumption of conformity
afforded by the appropriate product standard.
Where buried in the ground, a protective conductor connected to an earth electrode for the purposes of (ii) or (iii)
shall have a cross-sectional area not less than that stated in Table 54.1.
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Protective conductors and exposed-conductive-parts downstream of a protective device provided for the purposes
of (iii), (iv) and (v) shall have no connection to:
(a) any protective conductors or exposed-conductive-parts of any circuit not protected by the same protective
device; or
(b) any extraneous-conductive-part.
NOTE 6: Creating a TT earthing system for charging equipment or the whole installation as an alternative to
using a PME earthing facility with one of methods (i) to (v) above may not be an appropriate
solution due to the inability to provide sufficient separation from buried metalwork connected to
the supply PEN conductor
722.413 Protective measure: Electrical separation
722.413.1.2 This protective measure shall be limited to the supply of one electric vehicle supplied from
one unearthed source. The circuit shall be supplied through a fixed isolating transformer complying with
BS EN 61558-2-4.
NOTE: An example of an arrangement for the supply of a Class I electric vehicle charging point from a separated source is
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shown in Annex A722, Item A722.5.
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722.511 Compliance with standards
722.511.1 Where an EV charging point is built into a low voltage switchgear or controlgear assembly the
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requirements of the relevant part of BS EN 61439 series shall apply.
722.511.101 EV charging equipment shall comply with the appropriate parts of the BS EN 61851
series. EV charging equipment shall comply with the appropriate parts of the BS EN 61851 series.
722.512
Where installed outdoors, the equipment shall provide a degree of protection of at least IPX4.
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Where installed outdoors, the equipment shall provide a degree of protection of at least IP4X.
722.531 Devices for protection against electric shock by automatic disconnection of supply
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722.531.3.101 Unless supplied by a circuit using the protective measure of electrical separation, each charging
point incorporating a socket-outlet or vehicle connector complying with the BS EN 62196 series shall be protected
by an RCD having a rated residual operating current not exceeding 30 mA.
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NOTE: The maximum neutral current (Im) occurs under conditions of maximum imbalance, not necessarily maximum overall
demand.
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Where triple harmonics can be neglected, condition (i) of Regulation 722.411.4.1 may be assumed to apply where
the following condition is met. This formula should take account of Cmax in line with PD CLC/TR 50480.
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A722.3 Earth electrode resistance
For the purposes of condition (ii) of Regulation 722.411.4.1, the sum of the resistances of the earth electrode and the
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protective conductor connecting it to the main earthing terminal must meet the following condition, as applicable.
For a single-phase installation:
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NOTE 1: The above three-phase formula for RA ev is valid only where
. Where this is not the case,
this indicates that condition (i) of Regulation 722.411.4.1 applies and that an earth electrode is not required for the
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(a) the circuit protective conductor and a suitable measurement earth electrode, or
(b) the circuit protective conductor and a reference point derived from the line conductors of a three-phase
system, provided that suitable precautions are also taken to disconnect the device when the supply to one or
more-line conductors is interrupted.
:KHUHXVHGPHDVXUHPHQWHDUWKHOHFWURGHVVKRXOGEHORFDWHGDWDVX൶FLHQWGLVWDQFHIURPRWKHUHDUWKHOHFWURGHV
and/or other buried exposed-conductive-parts and/or extraneous-conductive-parts connected to the PME earthing
terminal to reduce transfer of earth potential rise on the PME system during a PEN failure.
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INDEX
The following entries are pertinent to Section 722:
E P
(OHFWULFYHKLFOH(9GH¿QLWLRQ Part 2 Protective multiple earthing (PME) -
Electric vehicle charging installations - electric vehicle charging
- Sec 722 installations 722.411.4.1
- application, scope of 722.1 R
- charging point outdoors, IP rating 722.512.2.201
- connectors 722.55.101 Residual current devices (RCDs) -
- GHGLFDWHG¿QDOFLUFXLWUHTXLUHG 722.311 722.533.101 - electric vehicle charging points 722.531.3.101
- GH¿QLWLRQVUHODWLQJWR Part 2 EV
- electrical separation, limitation on S
use of 722.413.1.2
- H[WHUQDOLQÀXHQFHV 722.512.2 Socket-outlets -
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- load curtailment 722.311.201 - electric vehicle charging 722.551.7.2 722.55.101
- maximum demand 722.311
- for supply of the fixed installation
- overcurrent protection 722.533.101
by the EV 722.551.7.2
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- protective measures not permitted 722.410.3.5 & 6
- RCDs
- RDC-DD
722.531.3
722.531.3.101
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- selection and erection 722.5
- socket-outlets for 722.55.101
- TN system - 722.411.4
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- 3(1FRQGXFWRUSURKLELWHGLQ¿QDO
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circuit 722.312.2.1
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