SIST HD 60364-5-53:2016

SLOVENSKI STANDARD
SIST HD 60364-5-53:2016
01-januar-2016
1DGRPHãþD
SIST HD 50573-5-57:2014
SIST HD 60364-5-53:2015
1L]NRQDSHWRVWQHHOHNWULþQHLQãWDODFLMHGHO,]ELUDLQQDPHVWLWHYHOHNWULþQH
RSUHPH6WLNDOQHLQNUPLOQHQDSUDYHYHU]LMD(1RVQRYHQRYHPEHU
Low-voltage electrical installations - Part 5-53: Selection and erection of electrical
equipment - Switchgear and controlgear
Errichten von Niederspannungsanlagen - Teil 5-53: Auswahl und Errichtung elektrischer
Betriebsmittel - Schalt- und Steuergeräte
Installations électriques basse tension - Partie 5-53: Choix et mise en œuvre des
matériels électriques - Appareillage
Ta slovenski standard je istoveten z: HD 60364-5-53:2015
ICS:
29.130.01 Stikalne in krmilne naprave Switchgear and controlgear
na splošno in general
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST HD 60364-5-53:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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HARMONIZATION DOCUMENT HD 60364-5-53

DOCUMENT D'HARMONISATION

HARMONISIERUNGSDOKUMENT
November 2015
ICS 91.140.50, 29.120.50 Supersedes HD 50573-5-57:2014, HD 60364-5-53:2015
English Version
Low-voltage electrical installations - Part 5-53: Selection and
erection of electrical equipment - Switchgear and controlgear
Installations électriques basse tension - Partie 5-53: Choix Errichten von Niederspannungsanlagen - Teil 5-53:
et mise en œuvre des matériels électriques - Appareillage Auswahl und Errichtung elektrischer Betriebsmittel - Schalt-
und Steuergeräte
This Harmonization Document was approved by CENELEC on 2015-07-17. CENELEC members are bound to comply with the
CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document at national level.
Up-to-date lists and bibliographical references concerning such national implementations may be obtained on application to the CEN-
CENELEC Management Centre or to any CENELEC member.
This Harmonization Document exists in three official versions (English, French, German).
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. HD 60364-5-53:2015 E

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European foreword
This document (HD 60364-5-53:2015) has been prepared by CLC/TC 64 "Electrical installations and
protection against electric shock".

The following dates are fixed:

(dop) 2016-07-17
• latest date by which this document h
as to be implemented at national
level by publication of an identical
national standard or by endorsement
(dow) 2018-07-17
• latest date by which the national
standards conflicting with this
document have to be withdrawn

This document supersedes HD 60364-5-53:2015 and HD 50573-5-57:2014.

Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying
any or all such patent rights.


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530 Introduction
530.1 Scope
This part of HD 60364 deals with general requirements for isolation, switching, control and
monitoring and with the requirements for selection and erection of the devices provided to
fulfil such functions.
530.2 Normative references
HD 384.4.46 S2, Electrical installations of buildings - Part 4: Protection for safety - Chapter
46: Isolation and switching
HD 384.5.537 S2, Electrical installations of buildings - Part 5: Selection and erection of
electrical equipment - Chapter 53: Switchgear and controlgear - Section 537: Devices for
isolation and switching
HD 50573-5-57, Co-ordination of electrical equipment for protection, isolation, switching and
control
EN 60269 (all parts), Low-voltage fuses (IEC 60269, all parts)
HD 60364-1, Low-voltage electrical installations - Part 1: Fundamental principles, assessment
of general characteristics, definitions (IEC 60364-1)
HD 60364-4-41, Low-voltage electrical installations - Part 4-41: Protection for safety -
Protection against electric shock (IEC 60364-4-41)
HD 60364-4-42, Low voltage electrical installations - Part 4-42: Protection for safety -
Protection against thermal effects (IEC 60364-4-42)
HD 60364-4-43:2010, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent (IEC 60364-4-43:2008, mod. + corrigendum Oct. 2008)
HD 60364-5-51:2009, Electrical installations of buildings – Part 5-51: Selection and erection
of electrical equipment – Common rules (IEC 60364-5-51:2005, mod.)
HD 60364-5-534, Low-voltage electrical installations - Part 5-53: Selection and erection of
electrical equipment - Isolation, switching and control - Clause 534: Devices for protection
against overvoltages (IEC 60364-5-534)
EN 60669-2-2, Switches for household and similar fixed electrical installations – Part 2-2:
particular requirements – Electromagnetic remote-control switches (RCS) (IEC 60069-2-2)
EN 60669-2-4, Switches for household and similar fixed electrical installations – Part 2-4:
particular requirements – Isolating switches (IEC 60669-2-4)
EN 60670 (all parts), Boxes and enclosures for electrical accessories for household and
similar fixed electrical installations (IEC 60670, all parts)
EN 60898-1, Electrical accessories - Circuit breakers for overcurrent protection for household
and similar installations - Part 1: Circuit-breakers for a.c. operation (IEC 60898-1)
EN 60898-2, Electrical accessories - Circuit-breakers for overcurrent protection for household
and similar installations - Part 2: Circuit-breakers for a.c. and d.c. operation (IEC 60898-2)
EN 60947-1, Low-voltage switchgear and controlgear – Part 1: General rules (IEC 60947-1)
EN 60947-2:2006, Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
(IEC 60947-2:2006)
EN 60947-3, Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units (IEC 60947-3)
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EN 60947-4-1, Low-voltage switchgear and controlgear – Part 4-1: Contactors and motor-
starters – Electromechanical contactors and motor starters (IEC 60947-4-1)
EN 60947-6-1, Low-voltage switchgear and controlgear – Part 6-1: multiple function
equipment – Transfer Switching Equipment (IEC 60947-6-1)
EN 60947-6-2, Low-voltage switchgear and controlgear - Part 6-2: Multiple function equipment
- Control and protective switching devices (or equipment) (CPS) (IEC 60947-6-2)
EN 61008-1, Residual current operated circuit-breakers without integral overcurrent protection
for household and similar uses (RCCBs) - Part 1: General rules (IEC 61008-1)
EN 61008-2-1, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCB's) - Part 2-1: Applicability of the general
rules to RCCB's functionally independent of line voltage (IEC 61008-2-1)
EN 61009-1, Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) - Part 1: General rules (IEC 61009-1)
EN 61009-2-1, Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBO's) - Part 2-1: Applicability of the general rules to
RCBO's functionally independent of line voltage (IEC 61009-2-1)
EN 61095, Electromechanical contactors for household and similar purposes (IEC 61095)
EN 61439 (all parts), Low-voltage switchgear and controlgear assemblies (IEC 61439, all
parts)
EN 61557-8, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and
1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 8:
Insulation monitoring devices for IT systems (IEC 61557-8)
EN 61557-9, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500
V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 9:
Equipment for insulation fault location in IT systems (IEC 61557-9)
EN 62020, Electrical accessories - Residual current monitors for household and similar uses
(RCMs) (IEC 62020)
EN 62208, Empty enclosures for low-voltage switchgear and controlgear assemblies - General
requirements (IEC 62208)
EN 62423, Type F and type B residual current operated circuit-breakers with and without
integral overcurrent protection for household and similar uses (IEC 62423)
EN 62606, General requirements for arc fault detection devices (IEC 62606)

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530.3 Terms and definitions
530.3.1
control
1) deliberate action resulting in the operation of an apparatus;
2) a device which initiates the operation of an apparatus
[SOURCE: IEV 821-01-28]
530.3.2
isolation
function intended to make dead for reasons of safety all or a discrete section of the electrical
installation by separating the electrical installation, or section, from every source of electric
energy
[SOURCE: IEV 826-17-01]
530.3.3
monitor, verb
acquire a quantity value continuously or sequentially in order to check whether it is within
normal operating limits and, where appropriate, to signal if it passes its tolerance boundaries
[SOURCE: IEV 351-43-03]
530.3.4
switching
function intended to make or break the current in one or more electric circuits
530.3.5
co-ordination of electrical equipment
correct way of selecting electrical devices in series to ensure safety and continuity of service
of the installation taking into account short-circuit protection and/or overload protection and/or
selectivity
530.3.6
safety of electrical installation
safety of human, livestock and property against danger and damage which may arise in the
reasonable use of electrical installations and which is covered by measures for:
– protection against electric shock;
– protection against thermal effects;
– protection against overcurrent;
– protection against fault currents;
– protection against voltage disturbances and measures against o electromagnetic
influences;
– protection against power supply interruption where danger or damage is expected
Note 1 to entry: Continuity of supply may be necessary for certain circuits (e.g. circuits in medical locations,
circuits supplying emergency systems).
530.3.7
continuity of service
quality of an installation which is expressed by the extent to which the operation of an
electrical system approaches the ideal state of freedom from interruption, or which the
operation of electrical system minimizes supply interruption thanks to co-ordination of
electrical devices
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530.3.8
back-up protection
overcurrent co-ordination, in short-circuit conditions, of an OCPD in series with another
electrical device where the OCPD, generally but not necessarily on the supply side, effects
the overcurrent protection and prevents any excessive stress on the electrical device
Note 1 to entry: Back-up protection does not cover the combined short-circuit protection.
530.3.9
combined short-circuit protection
overcurrent co-ordination, in short-circuit conditions, of two OCPDs in series, resulting in a
combined short-circuit current capability higher than one OCPD alone
530.3.10
combined short-circuit capability
maximum short-circuit current which can be handled by two short-circuit protective devices in
series
530.3.11
selectivity
co-ordination of the operating characteristics of two or more protective devices such that, on
the incidence of overcurrents or residual currents within stated limits, the device intended to
operate within these limits does so, while the other(s) does (do) not
[SOURCE: IEV 441-17-15, modified]
Note 1 to entry: Distinction is made between series selectivity involving different overcurrent protective
devices passing substantially the same overcurrent and network selectivity involving protective devices passing
different proportions of the overcurrent.
530.3.12
total selectivity
selectivity where only the OCPD on the load side will operate up to the maximum prospective
short-circuit current at its point of installation
530.3.13
partial selectivity
selectivity where the OCPD on the load side only will operate up to a fault current (the
selectivity limit current) less than the maximum prospective short-circuit current at its point of
installation
530.3.14
overcurrent protective device (OCPD)
device provided to interrupt an electric circuit in case the conductor current in the electric
circuit exceeds a predetermined value for a specified duration
[SOURCE: IEV 826-14-14]
Note 1 to entry: Table 536.2 provides information regarding the different devices corresponding to the main
generic function.
530.3.15
short-circuit protective device (SCPD)
device intended to protect a circuit or parts of a circuit against short-circuit currents by
interrupting them
[SOURCE: EN 60947-1]
Note 1 to entry: Table 536.2 provides information regarding the different devices corresponding to the main
generic function.
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530.3.16
circuit-breaker
mechanical switching device, capable of making, carrying and breaking currents under normal
circuit conditions and also making, carrying for a specified time and breaking currents under
specified abnormal circuit conditions such as those of short circuit
[SOURCE: IEV 441-14-20]
Note 1 to entry: Table 536.2 provides information regarding the different devices corresponding to the main
generic function.
530.3.17
switch
device for changing the electric connections among its terminals
[SOURCE: IEV 151-12-22]
530.3.18
residual current device (RCD)
mechanical switching device designed to make, carry and break currents under normal
service conditions and to cause the opening of the contacts when the residual current attains
a given value under specified conditions
Note 1 to entry: A residual current device can be a combination of various separate elements designed to
detect and evaluate the residual current and to make and break current.
Note 2 to entry: RCD includes devices such as RCCB, RCBO, CBR and MRCD. Table 536.2 provides
information regarding the different devices corresponding to the main generic function.
[SOURCE: IEV 442-05-02, modified]
530.3.19
fuse
device that by the fusing of one or more of its specially designed and proportioned
components, opens the circuit in which it is inserted by breaking the current when this
exceeds a given value for a sufficient time. The fuse comprises all the parts that form the
complete device
[SOURCE: IEV 441-18-01]
530.3.20
contactor
mechanical switching device having only one position of rest, operated otherwise than by
hand, capable of making, carrying and breaking currents under normal circuit conditions
including operating overload conditions
[SOURCE: IEV 441-14-33]
530.3.21
overload relay
overcurrent relay or release intended for protection against overloads
[SOURCE: EN 60947-1]
530.3.22
control and protective switching device (CPS)
switching device (or equipment) capable of operation other than by hand, but with or without
local manual operating means. A CPS device provides both functions of contactor and OCPD
[SOURCE: EN 60947-6-2 modified]
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530.3.23
conditional short-circuit current
prospective current that a circuit or a switching device, protected by a specified short-circuit
protective device, can satisfactorily withstand for the total operating time of that device under
specified conditions of use and behaviour
[SOURCE: EN 60947-1]
530.3.24
desk study
assessment of behaviour of devices connected in series, taking into account all relevant
parameters delivered by manufacturer such as:
– design current;
– prospective short-circuit or fault current;
– operating time of devices;
– system voltage;
– energy (let through I²t values);
– peak let through current

530.4 General and common requirements
530.4.1 Every item of equipment shall be selected and erected so as to allow compliance with
the requirements stated in the following clauses of this part as well as the fundamental
principles of HD 60364-1 and the relevant rules in other parts of the HD 60364 series.
530.4.2 The moving contacts of all poles of multipole devices for isolation and switching shall
be so coupled mechanically that they make and break substantially together.
The moving contacts of multipole switching devices marked for the connection of the neutral
or mid-point may close before and open after the other contacts.
530.4.3 A switching device shall not be inserted in the neutral conductor alone.
530.4.4 Devices embodying more than one function, as defined in the following clauses, shall
comply with the relevant requirements of this part appropriate to each separate function.
530.4.5 Equipment intended for protection only shall not be provided for functional switching
of circuits.
NOTE Functional switching does not include disconnection and isolation of circuits for the purposes of testing
servicing and maintenance.
530.5 Fixing of equipment
530.5.1 Equipment shall be erected according to the manufacturer’s instructions in such a
way that connections between wiring and equipment shall not be subject to undue stress or
strain resulting from the foreseen use of the equipment.
530.5.2 Unenclosed type equipment shall be mounted in a suitable mounting box or enclosure
in compliance with EN 60670, EN 62208 or other relevant standard like EN 61439.
530.5.3 Equipment such as circuit breakers, switches, socket outlets, control equipment, etc.
may be installed in or on a cable trunking system in accordance with EN 50085 series.
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531 Devices for protection against electric shock by automatic disconnection
of supply
531.1 General
Devices for protection against electric shock by automatic disconnection of supply shall be
suitable for isolation in accordance with HD 384.4.46 S2 and Clause 537.
Automatic re-closing of devices for protection against electric shock by automatic
disconnection of supply is permitted in installations where access is restricted to electrically
instructed persons (BA4) or skilled persons (BA5) only.
NOTE Automatic re-closing of devices used for continuity of supply may also be used according to local or National
wiring rules for installations were access is permitted to ordinary persons (BA1) or children (BA2) or handicapped
persons (BA3) provided assessment means according to 4.3.2 of EN 50557:2011 are complied with.
Requirements for the selection of devices for protection against electric shock by automatic
disconnection of supply are given in the following sections:
In TN, TT and IT systems the following protective devices may be used:
– overcurrent protective devices in accordance with 531.2;
– residual current devices (RCDs) in accordance with 531.3.
Devices according to EN 60947-2 marked with the voltage value followed by the symbol
shall not be used in IT systems for such voltage.
In addition, in IT-systems the following monitoring devices may be used to detect insulation
fault conditions:
– Insulation monitoring devices (IMDs) in accordance with 538.1;
– equipment for insulation fault location in accordance with 538.2;
– residual current monitors (RCMs) in accordance with 538.4.

531.2 Overcurrent protective devices
531.2.1 General
Where overcurrent protective devices are used for the protection against electric shock by
automatic disconnection of supply they shall be selected in accordance with 533.
531.2.2 TN systems
In TN systems overcurrent protective devices when used as devices for fault protection shall
be selected and erected in order to comply with the requirements specified in Part 4-41 (see
in particular sub-clause 411.4.4).
If for certain equipment or for certain parts of the installation, the maximum tripping time of
the Table 41A cannot be fulfilled by the overcurrent protective devices, those parts shall be
protected by a residual current device (RCD) in compliance with 531.3.5.2.
In TN-S systems, the neutral need not be disconnected if the supply conditions are such that
the neutral conductor can be considered to be reliably at earth potential.
In TN-C systems, the PEN conductor shall not be disconnected.
531.2.3 TT systems
In TT systems, overcurrent protective devices may be used for fault protection provided that a
suitably low value of Z is permanently and reliably assured (see also 411.5.4 of Part 4-41) so
s
that in case of a fault, tripping of the overcurrent protective device in compliance with the
required disconnection times is ensured.
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531.2.4 IT systems
Overcurrent protective devices when used as devices for fault protection, in the event of a
second fault, shall comply with:
– 531.2.2, taking into account the requirements of 411.6.4.a) of Part 4-41, where exposed-
conductive-parts are interconnected; or
– 531.2.3, taking into account the requirements of 411.6.4.b) of Part 4-41, where exposed-
conductive-parts are earthed in groups or individually.
In IT systems, if disconnection required by part 4-41 in the event of the second fault to earth
cannot be achieved by an overcurrent protective device, one or more residual current devices
(RCDs) shall be used to provide the required fault protection within the installation.
NOTE Reference is also made to 411.3.2.6 where supplementary protective equipotential bonding is required in
those cases where automatic disconnection according to 411.3.2.1 cannot be achieved.
Overcurrent protective devices used in IT systems shall have line poles suitable for line-to-
line voltage applications and a neutral pole, if applicable, suitable for the line to neutral
voltage for operation in case of a second insulation fault.
In IT systems, in the event of a second fault, the operation of the overcurrent protective
device shall result in the disconnection of all corresponding live conductors, including the
neutral conductor, if any (see also 431.2.2 of Part 4-43).
531.3 Residual current devices (RCDs)
531.3.1 General
A residual current device shall ensure the disconnection of all live conductors of the circuit
protected.
The protective conductor shall not pass through the sensor of the residual current device
(RCD) beside exceptional cases, where passing through the sensor is unavoidable, e.g. in
case of armoured cables. In such exceptional cases the protective conductor alone has to be
passed again through the sensor but in the reverse direction. The protective conductor shall
be insulated and shall not be earthed neither at the first nor at the second passing through the
sensor.
A protective conductor current shall not contribute to the measurement of the residual current.
531.3.2 Unwanted tripping
Residual current protective devices shall be so selected and erected to limit the risk of
unwanted tripping. The following shall be considered:
– subdivision of circuits with individual associated residual current devices (RCDs). RCDs
shall be selected and the electrical circuits shall be subdivided in such a way that any
earth-leakage current likely to occur during normal operation of the connected load, will
not cause unwanted tripping of the device. See also Clause 314 of HD 60364-1.
In order to avoid unwanted tripping by protective conductor currents and/or earth leakage
currents the accumulation of such currents downstream the residual current device (RCD)
shall be not more than 0,3 times the rated residual operating current.
NOTE 1 This will also allow a better selection of the type of residual current devices (RCDs) according to the
nature of the circuit or the load.
NOTE 2 Residual current devices (RCDs) may operate at any value of residual current in excess of 50 % of the
rated residual current.
– use of short time-delayed residual current devices (RCDs) provided the applicable
requirements of HD 60364-4-41 are met.
NOTE 3 In the case of transient effects tripping of the residual current protective device may occur by charging of
bypass capacitors or by other electromagnetic disturbances.
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– coordination of general type residual current devices (RCDs), selective type RCDs and
time delayed RCDs (CBRs according to EN 60947-2) as covered in subclause 536
(currently covered in HD 50573-5-57).
– coordination of residual current devices (RCDs) with surge protective devices (SPD)
according subclause 534.2.6.
531.3.3 Types of RCDs
Different types of residual current devices (RCDs) exist depending on their behaviour in the
presence of d.c. components and frequencies other than the rated frequency:
– RCD Type AC: RCD tripping on alternating sinusoidal residual current, suddenly applied or
smoothly increasing.
– RCD Type A: RCD tripping on alternating sinusoidal residual current and on residual
pulsating direct current, suddenly applied or smoothly increasing.
NOTE 1 For RCD Type A tripping is ensured for residual pulsating direct currents superimposed on a smooth direct
current up to 0,006 A.
– RCD Type F: RCD for which tripping is ensured as for Type A and in addition:
– for composite residual currents, whether suddenly applied or slowly rising intended for
circuit supplied between phase and neutral or phase and earthed middle conductor;
– for residual pulsating direct currents superimposed on smooth direct current.
NOTE 2 For RCD Type F tripping is ensured for residual pulsating direct currents superimposed on a smooth direct
current up to 0,010 A.
– RCD Type B: RCD for which tripping is ensured as for Type F and in addition:
– for residual sinusoidal alternating currents up to 1 000 Hz;
– for residual alternating currents superimposed on a smooth direct current;
– for residual pulsating direct currents superimposed on a smooth direct current;
– for residual pulsating rectified direct current which results from two or more phases;
– for residual smooth direct currents whether suddenly applied or slowly increased
independent of polarity.
NOTE 3 For RCD Type B tripping is ensured for residual pulsating direct currents superimposed on a smooth direct
current up to 0,006 A.
For general purpose, type AC RCD may be used.
NOTE 4 For a guidance for the correct use of residual current operated protective devices for household and
similar use, see IEC/TR 62350.
NOTE 5 Some typical fault currents in circuits comprising semiconductors are given in the Informative Annex A.

531.3.4 Selection according to the accessibility to the installation
531.3.4.1 In a.c. installations where residual current devices (RCDs) are accessible to
ordinary persons (BA1), children (BA2) or handicapped persons (BA3) residual current
protective devices shall comply with:
– EN 61008-1 and EN 61008-2-1 for RCCBs; or
– EN 61009-1 and EN 61009-2-1 for RCBOs; or
– EN 62423 for RCCBs and RCBOs.
NOTE RCCB is a Residual Current operated Circuit Breaker without integral overcurrent protection. RCBO is a
Residual Current operated Circuit Breaker with integral overcurrent protection.
531.3.4.2 In a.c. installations where residual current devices (RCDs) are accessible only to
instructed persons (BA4) or skilled persons (BA5) residual current protective devices shall
comply with:
– EN 61008-1 and EN 61008-2-1 for RCCBs; or
– EN 61009-1 and EN 61009-2-1 for RCBOs; or
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– EN 62423 for RCCBs and RCBOs; or
– EN 60947-2 for CBRs and MRCDs.
NOTE CBR is a circuit-breaker incorporating residual current protection. MRCD is a modular residual current
device.
531.3.5 Residual current devices (RCDs) for fault protection
531.3.5.1 General
The use of residual current devices (RCDs) shall ensure the protection against fault in
compliance with 411.3 of Part 4-41.
The selection of residual current devices (RCDs) depends on the type of earthing system (see
531.3.5.2, 531.3.5.3 and 531.3.5.4).
531.3.5.2 TN system
Residual current devices (RCDs) shall be erected at the origin of that part
...