EN IEC 61820-1-2:2024

SLOVENSKI STANDARD
01-julij-2024
Električne inštalacije za razsvetljavo in radijske javljalnike na letališčih - 1-2. del:
Temeljna načela - Posebne zahteve za zaporedna vezja (IEC 61820-1-2:2024)
Electrical installations for lighting and beaconing of aerodromes - Part 1-2: Fundamental
principles - Particular requirements for series circuits (IEC 61820-1-2:2024)
Elektrische Anlagen für Beleuchtung und Befeuerung von Flugplätzen - Teil 1-2:
Allgemeine Grundsätze - Anforderungen an die Serienkreise (IEC 61820-1-2:2024)
Installations électriques pour l'éclairage et le balisage dans les aérodromes - Partie 1-2 :
Principes fondamentaux - Exigences particulières relatives aux circuits série (IEC 61820-
1-2:2024)
Ta slovenski standard je istoveten z: EN IEC 61820-1-2:2024
ICS:
29.140.50 Instalacijski sistemi za Lighting installation systems
razsvetljavo
49.100 Oprema za servis in Ground service and
vzdrževanje na tleh maintenance equipment
93.120 Gradnja letališč Construction of airports
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61820-1-2

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
ICS 29.140.50; 93.120
English Version
Electrical installations for lighting and beaconing of aerodromes -
Part 1-2: Fundamental principles - Particular requirements for
series circuits
(IEC 61820-1-2:2024)
Installations électriques pour l'éclairage et le balisage dans Elektrische Anlagen für Beleuchtung und Befeuerung von
les aérodromes - Partie 1-2 : Principes fondamentaux - Flugplätzen - Teil 1-2: Allgemeine Grundsätze -
Exigences particulières relatives aux circuits série Anforderungen an die Serienkreise
(IEC 61820-1-2:2024) (IEC 61820-1-2:2024)
This European Standard was approved by CENELEC on 2024-05-10. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61820-1-2:2024 E

European foreword
The text of document 97/267/FDIS, future edition 1 of IEC 61820-1-2, prepared by IEC/TC 97
"Electrical installations for lighting and beaconing of aerodromes" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 61820-1-2:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-10
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-05-10
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61820-1-2:2024 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60060-3 NOTE Approved as EN 60060-3
IEC 61000-4-5 NOTE Approved as EN 61000-4-5
IEC 61821 NOTE Approved as EN 61821
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60060 series High-voltage test techniques EN 60060 series
IEC 60364 series Low-voltage electrical installations HD 60364 series
IEC 61000 series Electromagnetic compatibility (EMC) EN 61000 series
IEC 61557 series Electrical safety in low voltage distribution EN IEC 61557 series
systems up to 1 000 V AC and 1 500 V DC
- Equipment for testing, measuring or
monitoring of protective measures
IEC 61820-1 2019 Electrical installations for aeronautical EN IEC 61820-1 2019
ground lighting at aerodromes - Part 1:
Fundamental principles
IEC 61820-3-2 - Electrical installations for lighting and EN IEC 61820-3-2 -
beaconing of aerodromes - Part 3-2:
Requirements for power supplies -
Particular requirements for series circuits
IEC 61820-3-4 - Electrical installations for lighting and EN IEC 61820-3-4 -
beaconing of aerodromes - Part 3-4: Safety
secondary circuits in series circuits -
General safety requirements
IEC 61823 - Electrical installations for lighting and EN 61823 -
beaconing of aerodromes - AGL series
transformers
IEC 63067 - Electrical installations for lighting and EN IEC 63067 -
beaconing of aerodromes - Connecting
devices - General requirements and tests

IEC 61820-1-2 ®
Edition 1.0 2024-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical installations for lighting and beaconing of aerodromes –

Part 1-2:Fundamental principles – Particular requirements for series circuits

Installations électriques pour l'éclairage et le balisage dans les aérodromes –

Partie 1-2 : Principes fondamentaux – Exigences particulières relatives aux

circuits série
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.50, 93.120 ISBN 978-2-8322-8579-4

– 2 – IEC 61820-1-2:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements . 9
4.1 General . 9
4.2 Series circuit power supply . 9
4.3 Isolation of field circuit . 9
4.4 Electrical supply to series circuit power equipment (i.e. CCRs) . 11
4.5 Series circuit maximum voltage . 11
4.6 Overcurrent protection . 11
4.7 Open circuit protection . 11
4.8 System insulation resistance . 12
4.9 Insulation resistance monitoring . 12
4.10 Operational insulation resistance value . 12
4.11 Fault protection . 12
4.12 Cables . 12
4.12.1 General . 12
4.12.2 Screened (shielded) cables for the primary circuit. 12
4.13 Earthing of equipment . 12
5 Selection and installation of AGL equipment and systems . 13
5.1 General . 13
5.2 Operational conditions . 13
5.2.1 Voltage . 13
5.2.2 Current . 13
5.2.3 Frequency . 13
5.2.4 Power . 13
5.3 Series circuit communication . 13
5.4 Electromagnetic compatibility (EMC) . 13
5.5 Impulse withstand voltage . 14
5.6 Accessibility . 14
5.7 Cable, transformer and duct installation . 14
5.8 Primary and secondary connecting devices . 14
5.9 Proximity of cables. 14
5.10 Labelling . 15
6 Inspection and testing. 15
6.1 Initial verification . 15
6.2 Periodic inspection and testing . 15
6.3 Visual inspection . 16
6.4 Testing . 17
6.4.1 General . 17
6.4.2 Conductor continuity . 17
6.4.3 Insulation resistance of field circuit . 17
6.4.4 SELV and PELV . 19
6.4.5 Earth electrode resistance . 19

IEC 61820-1-2:2024 © IEC 2024 – 3 –
6.4.6 Functional testing . 20
6.5 Certification and reporting . 20
6.6 Records . 20
Annex A (informative) New installation insulation value (under development). 21
Annex B (informative) AGL installation certificate . 23
Annex C (informative) Schedule of verification . 31
Bibliography . 34

Figure 1 – Field circuit isolator modes of operation . 11

Table 1 – Test voltages and insulation resistance values . 18
Table A.1 – Theoretical leakage currents in series circuit elements as a function of
cable voltage class . 21
Table B.1 – AGL installation certificate . 23
Table B.2 – AGL periodic inspection and testing report . 26
Table B.3 – AGL circuit continuity and insulation resistance test results. 29
Table C.1 – Schedule of verification . 31

– 4 – IEC 61820-1-2:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSTALLATIONS FOR LIGHTING
AND BEACONING OF AERODROMES –
Part 1-2: Fundamental principles –
Particular requirements for series circuits

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61820-1-2 has been prepared by IEC technical committee 97: Electrical installations for
lighting and beaconing of aerodromes. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
97/267/FDIS 97/268/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
IEC 61820-1-2:2024 © IEC 2024 – 5 –
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 61820 series, published under the general title Electrical installations
for lighting and beaconing of aerodromes, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
– 6 – IEC 61820-1-2:2024 © IEC 2024
INTRODUCTION
This document is a part of the IEC 61820 series that describes the minimum requirements for
the lifecycle of an aeronautical ground lighting (AGL) system including design, installation,
commissioning, maintenance, decommissioning and disposal.
The series circuit normally operates with a constant current and a load dependent variable
voltage. The protective measures for series circuits according to this document are adapted to
that supply concept and the extreme long cables in the field. They are based in principle on an
IT supply concept (floating and separated from ground) and the protection against direct contact
to any live part at least for the primary circuit and safety extra low voltage (SELV) or protective
extra low voltage (PELV) power supply feeding the light fixtures or other loads of the series
circuit. In recognition of possible aviation hazards, an automatic disconnection of the AGL
system in case of an electrical failure is not required in general (see details in IEC 61820-1).
People involved in work on AGL electrical systems are knowledgeable of the specific risks and
the safety procedures involved in the work related to the applied system design. It is strongly
recommended to do a work safety risk analysis considering all local circumstances to define
safe work procedures and training to the personnel. Training regarding the hazards of series
circuits should be provided to non-electricians (e.g. grass cutters, snow plow operators, etc.)
NOTE 1 For specifications on SELV/PELV power supplies for AGL systems, see IEC 61820-3-4.
NOTE 2 Local/national regulations can be different to these standard provisions.
NOTE 3 In case the power supply is not compliant to SELV or PELV, appropriate measures can be implemented.
NOTE 4 Where the terms "voltage" and "current" are used in this document, they refer to RMS values unless
otherwise specified.
IEC 61820-1-2:2024 © IEC 2024 – 7 –
ELECTRICAL INSTALLATIONS FOR LIGHTING
AND BEACONING OF AERODROMES –
Part 1-2: Fundamental principles –
Particular requirements for series circuits

1 Scope
This part of IEC 61820 describes requirements for AGL systems including power supplies,
transformation of energy, cables, and any electrical component utilized to produce the light
intended to be used as a visual aid for air and ground navigation based on IEC 61820-1,
complemented with series circuit specific topics.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60060 (all parts), High-voltage test techniques
IEC 60364 (all parts), Low-voltage electrical installations
IEC 61000 (all parts), Electromagnetic compatibility (EMC)
IEC 61557 (all parts), Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective measures
IEC 61820-1:2019, Electrical installations for aeronautical ground lighting at aerodromes –
Part 1: Fundamental principles
IEC 61820-3-2, Electrical installations for lighting and beaconing of aerodromes – Part 3-2:
Requirements for power supplies – Particular requirements for series circuit
IEC 61820-3-4, Electrical installations for lighting and beaconing of aerodromes – Safety
secondary circuits in series circuits – General safety requirements
IEC 61823, Electrical installations for lighting and beaconing of aerodromes – AGL series
transformers
IEC 63067, Electrical installations for lighting and beaconing of aerodromes – Connecting
devices – General requirements and tests

– 8 – IEC 61820-1-2:2024 © IEC 2024
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
This clause of IEC 61820-1:2019 is applicable, with the following additions:
3.1
AGL system
functional aeronautical ground lighting entity consisting of interoperable components such as
power supply, transformers, light fixtures, and other loads, etc.
Note 1 to entry: The general categories for AGL systems are:
– Category 1: The 6,6 A system. An AGL system with a maximum current of 6,6 A at 50/60 Hz utilizing the effective
current steps as defined in 61820-3-2.
– Category 2: The current controlled system. An AGL system with current amplitude control similar to the 6,6 A
system, but without predefined series circuit effective current steps or waveform characteristics.
– Category 3: The communication-controlled system. An AGL system wherein the luminosity levels are controlled
independently of the series circuit effective current, for example via power line communication or by other means
of information transmission.
Note 2 to entry: An AGL component can belong to more than one category. All category 1 AGL components are
interoperable in any category 1 AGL system installation. AGL components in category 2 or category 3 can be
noninteroperable with AGL components in the same category.
3.2
series circuit power supply
apparatus which produces a selectable constant current output and automatically adjusts the
voltage for variations in the loads, input voltage and service conditions as specified
Note 1 to entry: For 6,6 A series circuit power supplies, see IEC 61820-3-2 (particular requirements for series circuit
power supplies).
3.3
series circuit transformer
apparatus which provides power to light fixtures or other loads from their secondary circuits
Note 1 to entry: The series circuit transformer provides continuity of the primary series circuit in the event of a loss
of the load, and electrical separation between the primary circuit and the secondary circuit.
Note 2 to entry: For specifications on series circuits transformers, see IEC 61823. Devices other than transformers
meeting the requirements of IEC 61823 can be used to provide continuity and electrical separation.
3.4
primary series cable
screened or unscreened solid or multi-stranded single core cable used to link series
transformers and the constant current regulator (CCR) in the primary circuits of series systems
for lighting and beaconing of airports
Note 1 to entry: For specifications on 6,6 A AGL system cables, see IEC TS 62100.
Note 2 to entry: Some countries can have national standards for series circuit cables.
3.5
primary cable connecting device
single pole connecting device in accordance with IEC 63067 used to interconnect the different
elements in a primary circuit
IEC 61820-1-2:2024 © IEC 2024 – 9 –
3.6
secondary cable connecting device
multipole connecting device in accordance with IEC 63067 used to interconnect loads with
series transformers
3.7
series load
electrical device designed to be fed by constant current series circuits, such as (but not limited
to) light fixtures, signs, detection loops, precision approach path indicators (PAPI), etc.
3.8
light fixture
apparatus which distributes, filters or transforms the light transmitted from one or more light
sources
Note 1 to entry: This includes the light source, all the parts necessary for fixing and protecting the light source and,
where necessary, circuit auxiliaries together with the means for connecting them to the electrical supply.
4 Requirements
4.1 General
A series circuit shall be designed as one continuous primary loop connected to the output of
the series circuit power supply.
The output of the series circuit power supply shall be galvanically separated from the input (e.g.
the mains). All live conductors in the primary series circuits shall be insulated from earth.
A primary series circuit can feed multiple secondary circuits according to IEC 61820-1 to supply
the light fixtures or other loads. Each individual secondary circuit shall be separated from the
primary circuit by series circuit transformers according to IEC 61823 or any other method
providing the level of separation as required in IEC 61820-3-4.
4.2 Series circuit power supply
Series circuit power supplies shall be compliant with basic requirements contained within this
document.
4.3 Isolation of field circuit
When required, the primary series circuit shall be disconnected from any power supply using
an appropriate disconnecting device as indicated in IEC 61820-3-2. The conductors at the open
ends of the primary series circuit shall be shorted together and connected to earth for circuit
maintenance or open for insulation resistance to earth testing purposes.
When the circuit is earthed for maintenance purposes, the device shall be capable of being
locked in either the 'isolated' or 'earthed' position to prevent harm to maintenance personnel.
The different modes of operation of a field isolator device are shown in Figure 1.
The field circuit isolator can be installed within the series circuit power supply or as a standalone
external unit.
– 10 – IEC 61820-1-2:2024 © IEC 2024

IEC 61820-1-2:2024 © IEC 2024 – 11 –

Figure 1 – Field circuit isolator modes of operation
4.4 Electrical supply to series circuit power equipment (i.e. CCRs)
Power supply to series circuit power supply equipment shall be provided in accordance with
IEC 60364 series provisions.
4.5 Series circuit maximum voltage
The maximum voltage rating of a series circuit shall be defined by the maximum conductor to
earth voltage that could be delivered by the series circuit power supply.
4.6 Overcurrent protection
The series circuit power supply shall be provided with a means to prevent overcurrent in
accordance with IEC 61820-3-2.
The overcurrent cut off level shall be sufficient to prevent damages to any circuit equipment
and can include protective devices. The overcurrent cut off values set by the manufacturer of
the constant current regulator shall be documented by the supplier and made available to the
maintenance personnel.
4.7 Open circuit protection
An open primary circuit shall be detected by the constant current regulator supplying the primary
circuit in accordance with IEC 61820-3-2. This shall cause the CCR to automatically cut off the
series circuit power supply in a maximum of 1 s.
The open primary circuit detection shall reliably detect the opening of the primary cable line
and capacitive leakages due to long primary circuits shall not prevent open-circuit protection.
Any open secondary circuit shall not disturb the primary open circuit protection.
NOTE The open primary circuit does not allow any use of the AGL and represents a high risk for an electrical shock
at the point of the line opening. The energy cut off is as fast as possible but robust enough to prevent miss detection.
For a constant current regulator (CCR), IEC 61820-3-2 describes a sufficient test for the open primary circuit
protection.
– 12 – IEC 61820-1-2:2024 © IEC 2024
4.8 System insulation resistance
A primary series circuit shall be designed so that a new installation provides a minimum
insulation resistance in accordance with 6.4.3.
4.9 Insulation resistance monitoring
The insulation level to earth of an active primary series circuit shall be monitored according to
IEC 61820-1.
4.10 Operational insulation resistance value
To declare the system functional, the circuit shall have a minimum operational insulation
resistance value to earth according to Table 1.
4.11 Fault protection
Adoption of fault protection against electrical hazards is highly recommended to ensure
personal safety and mitigate the risk of potentially fatal accidents. Refer to IEC 61820-3-4.
4.12 Cables
4.12.1 General
Rated insulation voltage of cables shall be in accordance with the voltage class the cable shall
be used with.
For the primary circuit, the maximum output voltage of the power supply shall be used for the
voltage level to earth.
Cable selection shall be chosen to be suitable for the circuit nominal current.
NOTE Information on series cable used for 6,6 A AGL systems is given in IEC TS 62100.
4.12.2 Screened (shielded) cables for the primary circuit
Where screened cables are used, the screen shall be continuous over the full length of the
cable and be bonded to earth using ground rods, at regular intervals along the entire circuit
loop. Bonding the cable screen to the inside of a steel base can is acceptable provided the base
cans are connected to ground rods are regular intervals along the entire circuit loop.
NOTE Where shielded cables and powerline communications are used, the manufacturer of the powerline
communication system is consulted on shield specifications.
4.13 Earthing of equipment
According to local regulation, earthing of equipment can be required.
When earthing is not possible and safety conditions would have required it, alternative solutions
should be evaluated, such as the application of non-easily removable protections, obstacles or
other solutions. For example, isolating transformers powering an approach lighting tower
outside the airport premises shall be in a locked enclosure, or non-earthed equipment located
outside the airport premises be in a fenced area with a key-access gate.

IEC 61820-1-2:2024 © IEC 2024 – 13 –
5 Selection and installation of AGL equipment and systems
5.1 General
Every item of equipment shall be selected and installed so as to allow compliance with IEC
61820-1 and other applicable IEC standard and shall take account of the manufacturer's
instructions.
Where the equipment to be used is not covered by an applicable IEC standard, or is used
outside the scope of its standard, it shall be demonstrated that the equipment provides at least
the adequate degree of safety and functionality as that afforded by compliance with the
standard.
The manufacturer of AGL products such as AGL power supplies, transformers or light fixtures
shall specify the relevant information concerning the applicable AGL system in the literature or
data sheets, or both.
5.2 Operational conditions
5.2.1 Voltage
Every item of equipment shall be suitable for the nominal voltage of the installation where
necessary taking account of the maximum voltage likely to occur in normal service.
5.2.2 Current
Every item of equipment shall be suitable for the design current, considering any capacitive and
inductive effects.
5.2.3 Frequency
If frequency has an influence on the characteristics of the equipment, the rated frequency of
the equipment should correspond to the nominal frequency of the supply to the connected
circuit.
5.2.4 Power
Every item of equipment selected based on its power characteristics shall be suitable for the
duty demanded.
5.3 Series circuit communication
Where serial communications are implemented on series circuits, particular care to system
design and choice of equipment shall be taken to ensure safe and reliable communication.
The manufacturer of the serial communication system shall be consulted to ensure that the
design and choice of equipment do not compromise their requirements for successful, reliable
communications.
5.4 Electromagnetic compatibility (EMC)
Every item of equipment shall be selected and installed so that it will neither cause harmful
effects to other equipment nor impair the supply during normal service including switching
operations.
The designer shall ensure that the installed equipment, where relevant, is designed and
manufactured in accordance with provisions of EMC standards. Refer to the IEC 61000 series.

– 14 – IEC 61820-1-2:2024 © IEC 2024
5.5 Impulse withstand voltage
Equipment shall be selected so that its impulse withstand is at least equal to the required
minimum impulse withstand voltage according to the overvoltage category at the point of
installation. Tests should be carried out as defined in IEC 60060-3.
5.6 Accessibility
Every item of equipment shall be arranged to facilitate its operation, inspection, maintenance
and access to each component. Such facility shall not be impaired by mounting equipment in
an enclosure or a compartment.
5.7 Cable, transformer and duct installation
Buried cables and ducts shall be at a sufficient depth to avoid being damaged by any reasonably
foreseeable disturbance of ground (see IEC 61820-1).
Where a cable or duct passes through elements of a building construction such as floors
(including pits), walls, cavity barriers, the openings remaining after a passage of the cable or
duct shall be sealed to accord with the required degree of fire-resistance, if applicable, and to
prevent moisture ingress.
Cables, including joints, connectors and transformers located in pits are to be suitably
supported at such a height as to minimise contact with water that can collect in the bottom of
the pit. Certain locations with excessive water can require draining in pits.
Primary V3 series circuit cables shall not be directly installed in the pavement material. Where
primary V1 or V2 series circuit cables or secondary cables are to be installed directly in the
pavement material, suitable physical protection is to be provided to the cable.
5.8 Primary and secondary connecting devices
A suitable method of connecting equipment to the primary series circuit cable shall be selected.
This can comprise:
– plug and socket arrangement to IEC 63067 or a connector providing the same safety
functionality;
– crimp and heat shrink joint;
– crimp and epoxy resin filled joint.
To enable local disconnection of the light fixture from the secondary circuit a plug and socket
can be installed adjacent to the light fixture.
Where the cable is located within or is attached to an elevated structure, connecting devices
shall meet frangibility requirements of the structure. If secondary cables are mounted on the
elevated structure, the connector shall be located on the bottom portion of the elevated
structure.
5.9 Proximity of cables
V1, V2, or V3 cables shall not be contained in the same duct.
V1, V2, or V3 equipment shall not be contained in the same pit, except where:
– the pit contains one or more isolating transformers, or
– every cable or conductor is insulated for the highest voltage present, or
– the cables are insulated for their system voltage and installed in separate cable ducts, or

IEC 61820-1-2:2024 © IEC 2024 – 15 –
– equipment of different voltage classes are separated by a sufficient distance (local
regulations can apply), or
– a safety assessment has been conducted and adapted maintenance procedures are in force.
Where cables in a pit have different insulation values as part as a device (e.g. an isolating
transformer with factory molded leads), the cables are to be suitably segregated and where a
pit contains more than one isolating transformer, the pit shall be suitably sized to allow for
adequate segregation of cables with different voltage levels.
In the event of crossing or proximity of underground communication cables and underground
AGL cable, a minimum clearance of 150 mm shall be maintained.
5.10 Labelling
Subclause 8.1 of IEC 61820-1:2019 is applicable with additions:
– every item of equipment or enclosure within which a nominal voltage exceeding V1 limits
exists shall be so arranged that before access is gained a warning of the maximum voltage
is clearly visible;
– where applicable, a dedicated warning sign shall be placed on equipment fed by more than
one power supply.
6 Inspection and testing
6.1 Initial verification
Every installation shall, during construction and on completion before being put into service, be
inspected and tested to verify that the requirements of this document have been met.
Prior to installation and during works, regular inspection on equipment should be performed
and recorded.
The verification shall include comparison of the results with the relevant design criteria to
confirm that the requirements have been met. The extent and results of the verification tests
shall be recorded.
The verification shall be made by one or more person(s) suitably trained in such work.
On completion of the verification a certificate shall be prepared. An example schedule of
verification certificate is given in Annex C.
6.2 Periodic inspection and testing
Periodic inspection and testing shall be carried out in order to determine whether the installation
is in satisfactory condition for continued service. Where possible, the documentation arising
from the initial certification and any previous periodic inspection and testing shall be taken into
account. Where no previous documentation is available, investigation of the installation shall
be undertaken prior to carrying out the periodic inspection and testing.
Periodic inspection comprising a detailed examination of the installation shall be carried out
without dismantling, or with partial dismantling as required, supplemented by the tests in 6.4 to
provide for:
– safety of persons and livestock against the effects of electric shock and burns;
– confirmation that the installation is not damaged or deteriorated so as to impair safety;
– the identification of defects that can give rise to danger;

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The periodic inspection and testing shall be carried out by person(s) competent in such work
and the extent and results of the testing shall be recorded.
Precautions shall be taken to avoid danger of persons and livestock, and to avoid danger and
installed equipment, during inspection and testing.
The frequency of the periodic inspection and testing shall be determined by the frequency and
quality of maintenance and the external influences to which it is subjected. The results and
recommendations of the previous report, if any, shall be taken into account.
The periodic inspection and testing can be replaced by an adequate regime of continuous
monitoring and maintenance of the installation, and all its constituent parts, by one or more
person(s) competent in the work. Appropriate records shall be kept.
6.3 Visual inspection
Inspection shall precede testing and shall normally be done with that part of the installation
under inspection disconnected from the supply.
The inspection shall be made to verify that the installed electrical equip
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