IEC 60364-5-54:2011
(Main)Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
IEC 60364-5-54:2011 addresses the earthing arrangements and protective conductors including protective bonding conductors in order to satisfy the safety of the electrical installation. This third edition cancels and replaces the second edition, published in 2002, and constitutes a technical revision. The main changes with respect to the previous edition are listed below:
- clarification of the definition of protective conductor;
- improved specification of mechanical characteristics of the earth electrode;
- introduction of earth electrode for protection against electric shock and lighting protection;
- annexes describing concrete-embedded foundation earth electrodes and soil-embedded earth electrode.
Installations électriques basse-tension - Partie 5-54: Choix et mise en oeuvre des matériels électriques - Installations de mise à la terre et conducteurs de protection
La CEI 60364-5-54:2011 concerne les installations de mise à la terre et les conducteurs de protection, y compris les conducteurs de liaison de protection afin de satisfaire à la sécurité de l'installation électrique. Cette troisième édition annule et remplace la deuxième édition, parue en 2002, et constitue une révision technique. Les principales modifications par rapport à l'édition précédente sont les suivantes:
- la définition de conducteur de protection a été clarifiée;
- les caractéristiques mécaniques et physiques de la prise de terre ont été mieux spécifiées;
- introduction d'une prise de terre pour la protection contre les chocs électriques et la protection foudre;
- annexes qui décrivent les prises de terre à fond de fouille noyées dans le béton et les prises de terre noyées dans le sol.
Nizkonapetostne električne inštalacije - 5-54. del: Izbira in namestitev električne opreme - Ozemljitve, zaščitni vodniki in vodniki za zaščitno izenačitev potencialov
General Information
Standards Content (Sample)
IEC 60364-5-54
Edition 3.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Low-voltage electrical installations –
Part 5-54: Selection and erection of electrical equipment – Earthing
arrangements and protective conductors
Installations électriques basse-tension –
Partie 5-54: Choix et mise en œuvre des matériels électriques – Installations de
mise à la terre et conducteurs de protection
IEC 60364-5-54:2011
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60364-5-54
Edition 3.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Low-voltage electrical installations –
Part 5-54: Selection and erection of electrical equipment – Earthing
arrangements and protective conductors
Installations électriques basse-tension –
Partie 5-54: Choix et mise en œuvre des matériels électriques – Installations de
mise à la terre et conducteurs de protection
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 29.020; 91.140.50 ISBN 978-2-88912-400-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 2 – 60364-5-54 IEC:2011
CONTENTS
FOREWORD ........................................................................................................................... 4
INTRODUCTION ..................................................................................................................... 6
541 General ......................................................................................................................... 7
541.1 Scope ................................................................................................................. 7
541.2 Normative references ......................................................................................... 7
541.3 Terms and definitions ......................................................................................... 8
542 Earthing arrangements .................................................................................................. 9
542.1 General requirements ......................................................................................... 9
542.2 Earth electrodes ............................................................................................... 10
542.3 Earthing conductors ......................................................................................... 12
542.4 Main earthing terminal ...................................................................................... 13
543 Protective conductors .................................................................................................. 13
543.1 Minimum cross-sectional areas ........................................................................ 13
543.2 Types of protective conductors ......................................................................... 15
543.3 Electrical continuity of protective conductors .................................................... 16
543.4 PEN, PEL or PEM conductors .......................................................................... 16
543.5 Combined protective and functional earthing conductors .................................. 18
543.6 Currents in protective earthing conductors ....................................................... 19
543.7 Reinforced protective earthing conductors for protective earthingconductor currents exceeding 10mA ................................................................. 19
543.8 Arrangement of protective conductors .............................................................. 19
544 Protective bonding conductors ..................................................................................... 19
544.1 Protective bonding conductors for connection to the main earthingterminal ............................................................................................................ 19
544.2 Protective bonding conductors for supplementary bonding ............................... 20
Annex A (normative) Method for deriving the factor k in 543.1.2 (see also IEC 60724
and IEC 60949) ..................................................................................................................... 21
Annex B (informative) Example of earthing arrangements and protective conductors ........... 25
Annex C (informative) Erection of concrete-embedded foundation earth electrodes ............. 27
Annex D (informative) Erection of soil-embedded earth electrodes ....................................... 30
Annex E (informative) List of notes concerning certain countries .......................................... 34
Bibliography .......................................................................................................................... 40
Figure 54.1 – Examples of a PEN conductor connection ....................................................... 18
Figure B.54.1 – Examples of earthing arrangements for foundation earth electrode,
protective conductors and protective bonding conductors ..................................................... 26
Table 54.1 – Minimum size of commonly used earth electrodes, embedded in soil orconcrete used to prevent corrosion and provide mechanical strength .................................... 11
Table 54.2 – Minimum cross-sectional area of protective conductors (where notcalculated in accordance with 543.1.2) ................................................................................. 14
Table A.54.1 – Value of parameters for different materials .................................................... 21
Table A.54.2 – Values of k for insulated protective conductors not incorporated in
cables and not bunched with other cables ............................................................................. 22
Table A.54.3 – Values of k for bare protective conductors in contact with cablecovering but not bunched with other cables .......................................................................... 22
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Table A.54.4 – Values of k for protective conductors as a core incorporated in a cable
or bunched with other cables or insulated conductors ........................................................... 23
Table A.54.5 – Values of k for protective conductors as a metallic layer of a cable, e.g.
armour, metallic sheath, concentric conductor, etc. ............................................................... 24
Table A.54.6 – Values of k for bare conductors where there is no risk of damage to any
neighbouring material by the temperature indicated .............................................................. 24
Table D.54.1 – Resistivity for types of soil ............................................................................ 31
Table D.54.2 – Variation of the resistivity for different types of soil ....................................... 31
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 5-54: Selection and erection of electrical equipment –
Earthing arrangements and protective conductors
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
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60364-5-54 has been prepared by IEC technical committee
64: Electrical installations and protection against electric shock.This third edition cancels and replaces the second edition, published in 2002, and constitutes
a technical revision.The main changes with respect to the previous edition are listed below:
– clarification of the definition of protective conductor;
– improved specification of mechanical characteristics of the earth electrode;
– introduction of earth electrode for protection against electric shock and lighting protection;
– annexes describing concrete-embedded foundation earth electrodes and soil-embedded
earth electrode.The text of this standard is based on the following documents:
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60364-5-54 IEC:2011 – 5 –
FDIS Report on voting
64/1755/FDIS 64/1766/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.It has the status of a basic safety publication in accordance with IEC Guide 104.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The reader's attention is drawn to the fact that Annex E lists all of the "in-some-country"
clauses on differing practices of a less permanent nature relating to the subject of this
standard.A list of all parts in the IEC 60364 series, under the general title: Low-voltage electrical
installations, can be found on the IEC website.The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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– 6 – 60364-5-54 IEC:2011
INTRODUCTION
Clause numbering is sequential, preceded by the number of this Part. Numbering of figures
and tables takes the number of this part followed by a sequential number, i.e. Table 54.1,
54.2, etc. Numbering of figures and tables in annexes takes the letter of the annex, followed
by the number of the part, followed by a sequential number, e.g. A.54.1, A.54.2, etc.
---------------------- Page: 8 ----------------------60364-5-54 IEC:2011 – 7 –
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 5-54: Selection and erection of electrical equipment –
Earthing arrangements and protective conductors
541 General
541.1 Scope
This part of IEC 60364 addresses the earthing arrangements and protective conductors
including protective bonding conductors in order to satisfy the safety of the electrical
installation.541.2 Normative references
The following referenced documents are indispensable for the application 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 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shockIEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbancesIEC 60364-5-51:2005, Electrical installations of buildings – Part 5-51: Selection and erection
of electrical equipment – Common rulesIEC 60439-2, Low-voltage switchgear and controlgear assemblies – Part 2: Particular
requirements for busbar trunking systems (busways)IEC 61439-1, Low-voltage switchgear and controlgear assemblies – Part 1: General rules
IEC 61439-2, Low-voltage switchgear and controlgear assemblies – Part 2: Power switchgear
and controlgear assembliesIEC 60724, Short-circuit temperature limits of electric cables with rated voltages of 1 kV (U =
1,2 kV) and 3 kV (U = 3,6 kV)IEC 60909-0, Short-circuit currents in three-phase a.c. systems – Part 0: Calculation of
currentsIEC 60949, Calculation of thermally permissible short-circuit currents, taking into account
non-adiabatic heating effectsIEC 61140:2001, Protection against electric shock – Common aspects for installation and
equipmentIEC 61534-1, Powertrack systems – Part 1: General requirements
IEC 62305 (all parts) Protection against lightning
IEC 62305-3:2006, Protection against lightning – Part 3: Physical damage to structures and
life hazard---------------------- Page: 9 ----------------------
– 8 – 60364-5-54 IEC:2011
541.3 Terms and definitions
For the purposes of this document, the terms and definitions of IEC 61140, together with the
following definitions, apply.Definitions used for earthing arrangements, protective conductors and protective bonding
conductors are illustrated in Annex B and listed below:541.3.1
exposed-conductive-part
conductive part of equipment which can be touched and which is not normally live, but which
can become live when basic insulation fails[IEC 60050-826:2004, 826-12-10]
541.3.2
extraneous-conductive-part
conductive part not forming part of the electrical installation and liable to introduce an electric
potential, generally the electric potential of a local earth[IEC 60050-825:2004, IEV 826-12-11]
541.3.3
earth electrode
conductive part, which may be embedded in the soil or in a specific conductive medium, e.g.
concrete, in electrical contact with Earth[IEC 60050-826:2004, 826-13-05, modified]
541.3.4
concrete-embedded foundation earth electrode
earth electrode embedded in concrete of a building foundation, generally in the form of a
closed loop[IEC 60050-826:2004, 826-13-08, modified]
541.3.5
soil-embedded foundation earth electrode
earth electrode buried in the soil under a building foundation, generally in the form of a closed
loop[IEC 60050-826:2004, 826-13-08, modified]
541.3.6
protective conductor
conductor provided for purposes of safety, for example protection against electric shock
[IEC 60050-826:2004, 826-13-22]NOTE Examples of a protective conductor include a protective bonding conductor, a protective earthing conductor
and an earthing conductor when used for protection against electric shock.---------------------- Page: 10 ----------------------
60364-5-54 IEC:2011 – 9 –
541.3.7
protective bonding conductor
protective conductor provided for protective-equipotential-bonding
[IEC 60050-826:2004, 826-13-24]
541.3.8
earthing conductor
conductor which provides a conductive path, or part of the conductive path, between a given
point in a system or in an installation or in equipment and an earth-electrode network
[IEC 60050-826:2004, 826-13-12]NOTE For the purposes of this part of IEC 60364, an earthing conductor is the conductor which connects the
earth electrode to a point in the equipotential bonding system, usually the main earthing terminal.
541.3.9main earthing terminal
main earthing busbar
terminal or busbar which is part of the earthing arrangement of an installation and enabling
the electrical connection of a number of conductors for earthing purposes[IEC 60050-826:2004, 826-13-15]
541.3.10
protective earthing conductor
protective conductor provided for protective earthing
[IEC 60050-826:2004, 826-13-23]
541.3.11
functional earthing
earthing a point or points in a system or in an installation or in equipment, for purposes other
than electrical safety[IEC 60050-826:2004, IEV 826-13-10]
541.3.12
earthing arrangement
all the electrical connections and devices involved in the earthing of a system, installation or
an equipment[IEC 60050-195:2004, 195-02-20]
542 Earthing arrangements
542.1 General requirements
542.1.1 The earthing arrangements may be used jointly or separately for protective and
functional purposes according to the requirements of the electrical installation. The
requirements for protective purposes shall always take precedence.542.1.2 Where provided, earth electrodes within an installation shall be connected to the
main earthing terminal using an earthing conductor.NOTE An installation does not need to have its own earth electrode.
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– 10 – 60364-5-54 IEC:2011
542.1.3 Where the supply to an installation is at high voltage, requirements concerning the
earthing arrangements of the high voltage supply and of the low-voltage installation shall also
comply with Clause 442 of IEC 60364-4-44:2007.542.1.4 The requirements for earthing arrangements are intended to provide a connection to
earth which:– is reliable and suitable for the protective requirements of the installation;
– can carry earth fault currents and protective conductor currents to earth without danger
from thermal, thermo-mechanical and electromechanical stresses and from electric shock
arising from these currents;– if relevant, is also suitable for functional requirements;
– is suitable for the foreseeable external influences (see IEC 60364-5-51), e.g. mechanical
stresses and corrosion.542.1.5 Consideration shall be given to the earthing arrangements where currents with high
frequencies are expected to flow (see Clause 444 of IEC 60364-4-44:2007).542.1.6 Protection against electric shock, as stated in IEC 60364-4-41, shall not be
adversely affected by any foreseeable change of the earth electrode resistance (e.g. due to
corrosion, drying or freezing).542.2 Earth electrodes
542.2.1 The type, materials and dimensions of earth electrodes shall be selected to
withstand corrosion and to have adequate mechanical strength for the intended lifetime.
NOTE 1 For corrosion, the following parameters may be considered: the soil pH at the site, soil resistivity, soil
moisture, stray and leakage a.c. and d.c. current, chemical contamination, and proximity of dissimilar materials.
For materials commonly used for earth electrodes, the minimum sizes, from the point of view
of corrosion and mechanical strength, when embedded in the soil or in concrete, shall be as
specified in Table 54.1.NOTE 2 The minimum thickness of protective coating is greater for vertical earth electrodes than for horizontal
earth electrodes because of their greater exposure to mechanical stresses while being embedded.
If a lightning protection system is required, 5.4 of IEC 62305-3:2006 applies.---------------------- Page: 12 ----------------------
60364-5-54 IEC:2011 – 11 –
Table 54.1 – Minimum size of commonly used earth electrodes, embedded in soil or
concrete used to prevent corrosion and provide mechanical strength
Cross- Thickness
Weight of
Diameter sectional Thickness of coating/
coating
Material and surface Shape
area sheathing
2 2
mm mm mm g/m µm
Steel embedded in Round wire 10
concrete (bare, hot
Solid tape or strip 75 3
galvanized or stainless)
Strip or shaped strip/plate
90 3 500 63
– Solid plate – Lattice plate
Round rod installed
16 350 45
vertically
Round wire installed
10 350 45
c horizontally
Steel hot-dip galvanized
Pipe 25 2 350 45
Stranded
70
(embedded in concrete)
Cross profile installed
(290) 3
vertically
Round rod installed
Steel copper-sheathed (15) 2 000
vertically
Round rod installed e
14 250
vertically
Steel with electro-
Round wire installed
deposited copper coating (8) 70
horizontally
Strip installed horizontally 90 3 70
Strip or shaped strip/plate 90 3
Round rod installed
vertically
Stainless steel
Round wire installed
horizontally
Pipe 25 2
Strip 50 2
Round wire installed
(25) 50
horizontally
Solid round rod installed
(12) 15
vertically
1,7 for
Copper
individual
Stranded wire
(25) 50
strands of
wire
Pipe 20 2
Solid plate (1,5) 2
Lattice plate 2
NOTE Values in brackets are applicable for protection against electric shock only, while values not in brackets are
applicable for lightning protection and for protection against electric shock.Chromium ≥16 %, Nickel ≥5 %, Molybdenum ≥2 %, Carbon ≤0,08 %.
As rolled strip or slit strip with rounded edges.
The coating shall be smooth, continuous and free from flux stains.
Where experience shows that the risk of corrosion and mechanical damage is extremely low, 16 mm² can be used.
This thickness is provided to withstand mechanical damage of copper coating during the installation process. It may
---------------------- Page: 13 ----------------------– 12 – 60364-5-54 IEC:2011
be reduced to not less than 100 µm where special precautions to avoid mechanical damage of copper during the
installation process (e.g. drilled holes or special protective tips) are taken according to the manufacturer’s
instructions.542.2.2 The efficacy of any earth electrode depends on its configuration and upon local soil
conditions. One or more earth electrodes suitable for the soil conditions and the value of
resistance to earth required shall be selected.Annex D gives methods of estimation of earth electrode resistance.
542.2.3 The following are examples of earth electrodes which may be used:
– concrete-embedded foundation earth electrode;
NOTE For more information see Annex C.
– soil-embedded foundation earth electrode;
– metallic electrode embedded directly in soil vertically or horizontally (e.g. rods, wires,
tapes, pipes or plates);– metal sheath and other metal coverings of cables according to local conditions or
requirements;– other suitable underground metalwork (e.g. pipes) according to local conditions or
requirements;– welded metal reinforcement of concrete (except pre-stressed concrete) embedded in the
earth.542.2.4 When selecting the type and embedded depth of an earth electrode, consideration
shall be given to possible mechanical damage and to local conditions to minimize the effect of
soil drying and freezing.542.2.5 Consideration shall be given to electrolytic corrosion when using different materials
in an earthing arrangement. For external conductors (e.g. earthing conductor) connected to a
concrete-embedded foundation earth electrode, the connection made from hot-dip galvanized
steel shall not be embedded in the soil.542.2.6 The earthing arrangement shall not rely on a metallic pipe for flammable liquids or
gases as the earth electrode and their buried length shall not be considered when
dimensioning the earth electrode.NOTE This requirement does not preclude the protective equipotential bo
...
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