SIST HD 60364-5-53:2022
(Main)Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear
Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear
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.
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 oeuvre des matériels électriques - Appareillage
Nizkonapetostne električne inštalacije - 5-53. del: Izbira in namestitev električne opreme - Stikalne in krmilne naprave
Ta del standarda HD 60364 obravnava splošne zahteve za ločevanje, stikanje, krmiljenje in nadzor ter zahteve za izbiro in namestitev naprav, ki te funkcije opravljajo.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST HD 60364-5-53:2022
01-julij-2022
Nadomešča:
SIST HD 60364-5-53:2016
SIST HD 60364-5-53:2016/A11:2017
SIST HD 60364-5-534:2016
SIST HD 60364-5-537:2017
SIST HD 60364-5-537:2017/A11:2017
Nizkonapetostne električne inštalacije - 5-53. del: Izbira in namestitev električne
opreme - Stikalne in krmilne naprave
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 oeuvre des
matériels électriques - Appareillage
Ta slovenski standard je istoveten z: HD 60364-5-53:2022
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 60364-5-53:2022 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 May 2022
ICS 91.140.50; 29.120.50 Supersedes HD 60364-5-534:2016 HD 60364-5-537:2016
HD 60364-5-53:2015 HD 60364-5-537:2016 + A11:2017
HD 60364-5-53:2015 + A11:2017
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 oeuvre des matériels électriques - Appareillage Auswahl und Errichtung elektrischer Betriebsmittel - Schalt-
und Steuergeräte
This Harmonization Document was approved by CENELEC on 2018-08-16. 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, 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,
Turkey 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. HD 60364-5-53:2022 E
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European foreword
This document (HD 60364-5-53:2022) has been prepared by CLC/TC 64 “Electrical installations and
protection against electric shock”.
The following dates are fixed:
• latest date by which this document has (dop) 2022-11-13
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2025-05-13
standards conflicting with this document
have to be withdrawn
This document supersedes HD 60364-5-53:2015, HD 60364-5-534:2016 and HD 60364-5-537:2016 and all of
their amendments and corrigenda (if any).
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.
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1 Introduction
1.1 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.
1.2 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.
EN 60038, CENELEC standard voltages (IEC 60038)
EN 60269 (series), Low-voltage fuses (IEC 60269 series)
EN 60309 (series), Plugs, socket-outlets and couplers for industrial purposes (IEC 60309 series)
HD 60364-1:2008, Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general
characteristics, definitions (IEC 60364-1:2005)
HD 60364-4-41:2007, Low-voltage electrical installations - Part 4-41: Protection for safety - Protection against
electric shock (IEC 60364-4-41:2005)
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 60364-4-443:2016, Low-voltage electrical installations - Part 4-44: Protection for safety - Protection
against voltage disturbances and electromagnetic disturbances - Clause 443: Protection against transient
overvoltages of atmospheric origin or due to switching (IEC 60364-4-44:2007/A1:2015, mod.)
HD 60364-4-46:2016, Low-voltage electrical installations - Part 4-46: Protection for safety - Isolation and
switching
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 60364-5-54, Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment
- Earthing arrangements and protective conductors (IEC 60364-5-54)
EN 60669-1, Switches for household and similar fixed-electrical installations - Part 1: General requirements
(IEC 60669-1)
EN 60669-2-1, Switches for household and similar fixed electrical installations – Part 2-1: Particular
requirements – Electronic switches (IEC 60669-2-1)
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 60669-2-3, Switches for household and similar fixed electrical installations - Part 2-3: Particular
requirements - Time delay switches (TDS) (IEC 60669-2-3)
EN 60669-2-4, Switches for household and similar fixed electrical installations - Part 2-4: Particular
requirements - Isolating switches (IEC 60669-2-4)
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EN 60669-2-5, Switches for household and similar fixed electrical installations - Part 2-5: Particular
requirements - Switches and related accessories for use in home and building electronic systems (HBES)
(IEC 60669-2-5)
EN 60669-2-6, Switches for household and similar fixed electrical installations - Part 2-6: Particular
requirements - Fireman's switches for exterior and interior signs and luminaires (IEC 60669-2-6)
EN 60670 (all parts), Boxes and enclosures for electrical accessories for household and similar fixed electrical
installations (IEC 60670)
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 60947-2:2006, 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)
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 60947-4-2, Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - AC
semiconductor motor controllers and starters (IEC 60947-4-2)
EN 60947-4-3, Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC
semiconductor controllers and contactors for non-motor loads (IEC 60947-4-3)
EN 60947-5-1, Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching
elements - Electromechanical control circuit devices (IEC 60947-5-1)
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 60947-7-1, Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for
copper conductors (IEC 60947-7-1)
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)
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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 61643-11:2012, Low-voltage surge protective devices - Part 11: Surge protective devices connected to
low-voltage power systems - Requirements and test methods (IEC 61643-11:2011, mod.)
CLC/TS 61643-12, Low-voltage surge protective devices - Part 12: Surge protective devices connected to
low-voltage power distribution systems - Selection and application principles (IEC 61643-12)
EN 61984:2009, Connectors - Safety requirements and tests (IEC 61984:2008)
EN 61995 (series), Devices for the connection of luminaires for household and similar purposes (IEC 61995
series)
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 62305-1, Protection against lightning - Part 1: General principles (IEC 62305-1)
EN 62305-2, Protection against lightning - Part 2: Risk management (IEC 62305-2)
EN 62305-4, Protection against lightning - Part 4: Electrical and electronic systems within structures
(IEC 62305-4)
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)
EN 62626-1, Low-voltage switchgear and controlgear enclosed equipment - Part 1: Enclosed switch-
disconnectors outside the scope of IEC 60947-3 to provide isolation during repair and maintenance work
(IEC 62626-1)
IEC 60417, Graphical symbols for use on equipment
IEC 60884 (series), Plugs and socket-outlets for household and similar purposes
IEC 60906 (series), IEC system of plugs and socket-outlets for household and similar purposes
1.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
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530.3.1
control
deliberate action resulting in the operation of an apparatus
[SOURCE: IEV 821-01-28, modified]
530.3.2
control
device which initiates the operation of an apparatus
[SOURCE: IEV 821-01-28, modified]
530.3.3
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]
530.3.4
monitor
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]
530.3.5
switching
function intended to make or break the current in one or more electric circuits
530.3.6
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
530.3.7
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).
530.3.8
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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530.3.9
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.
530.3.10
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
530.3.11
combined short-circuit capability
maximum short-circuit current which can be handled by two short-circuit protective devices in series
530.3.12
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
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.
[SOURCE: IEV 441-17-15, modified]
530.3.13
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
530.3.14
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
530.3.15
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
Note 1 to entry: Table 536.2 provides information regarding the different devices corresponding to the main generic
function.
[SOURCE: IEV 826-14-14]
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530.3.16
short-circuit protective device
SCPD
device intended to protect a circuit or parts of a circuit against short-circuit currents by interrupting them
Note 1 to entry: Table 536.2 provides information regarding the different devices corresponding to the main generic
function.
[SOURCE: EN 60947-1]
530.3.17
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
Note 1 to entry: Table 536.2 provides information regarding the different devices corresponding to the main generic
function.
[SOURCE: IEV 441-14-20]
530.3.18
switch
device for changing the electric connections among its terminals
[SOURCE: IEV 151-12-22]
530.3.19
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]
530.3.20
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]
530.3.21
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]
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530.3.22
overload relay
overcurrent relay or release intended for protection against overloads
[SOURCE: EN 60947-1]
530.3.23
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]
530.3.24
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]
530.3.25
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;
2
— energy (let through I t values);
— peak let through current
530.3.26
SPD assembly
one SPD or a set of SPDs, in both cases including all SPD disconnectors required by the SPD manufacturer,
providing the required overvoltage protection for a type of system earthing
530.3.27
SPD disconnector
disconnector
device for disconnecting an SPD, or part of an SPD, from the power system
Note 1 to entry: This disconnecting device is not required to have isolating capability for safety purposes. It is to
prevent a persistent fault on the system and is used to give an indication of an SPD’s failure. Disconnectors can be
internal (built in) or external (required by the manufacturer). There may be more than one disconnector function, for
example, an over-current protection function and a thermal protection function. These functions may be in separate units.
[SOURCE: EN 61643-11:2012, 3.1.28]
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530.3.28
mode of protection of an SPD
intended current path, between terminals that contains protective components, e.g. line-to-line, line-to-earth,
line-to-neutral, neutral-to-earth
[SOURCE: EN 61643-11:2012, 3.1.8]
530.3.29
follow current interrupt rating
I
fi
prospective short-circuit current that an SPD is able to interrupt without operation of a disconnector
[SOURCE: EN 61643-11:2012, 3.1.39]
530.3.30
short-circuit current rating
I
SCCR
maximum prospective short-circuit current from the power system for which the SPD, in conjunction with the
disconnector specified, is rated
[SOURCE: EN 61643-11:2012, 3.1.27]
530.3.31
voltage protection level
U
P
maximum voltage to be expected at the SPD terminals due to an impulse stress with defined voltage
steepness and an impulse stress with a discharge current with given amplitude and waveshape
Note 1 to entry: The voltage protection level is given by the manufacturer and may not be exceeded by:
— the measured limiting voltage determined for front-of-wave sparkover (if applicable) and the measured
limiting voltage determined from the residual voltage measurements at amplitudes corresponding to In
and/or Iimp respectively for test classes II and/or I;
— the measured limiting voltage at the open circuit voltage (UOC) of the combination wave generator,
determined for the combination wave for test class III.
Note 2 to entry: Information on the correlation between SPD Types and test classes according to the product standard is
provided in Annex A.
[SOURCE: EN 61643-11:2012, 3.1.14, mod. — Note 1 to entry is modified and Note 2 to entry is added.]
530.3.32
rated impulse voltage
U
W
impulse withstand voltage value assigned by the manufacturer to the equipment or to a part of it,
characterizing the specified withstand capability of its insulation against transient overvoltages
[SOURCE: IEC 60664-1:2007, 3.9.2, mod. — The abbreviation 'U ' is added.]
W
530.3.33
maximum continuous operating voltage
U
C
maximum r.m.s. voltage, which may be continuously applied to the SPD's mode of protection
Note 1 to entry: The U value covered by this standard may exceed 1 000 V.
C
[SOURCE: EN 61643-11:2012, 3.1.11]
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530.3.34
nominal discharge current for class II test
I
n
crest value of the current through the SPD having a current waveshape of 8/20
Note 1 to entry: Information on the correlation between SPD Types and test classes according to the product standard is
provided in Annex A.
[SOURCE: EN 61643-11:2012, 3.1.9, mod. — Note 1 to entry is added.]
530.3.35
impulse discharge current for class I test
I
imp
crest value of a discharge current through the SPD with specified charge transfer Q and specified energy W/R
in the specified time
Note 1 to entry: Information on the correlation between SPD Types and test classes according to the product standard is
provided in Annex A.
[SOURCE: EN 61643-11:2012, 3.1.10, mod. — Note 1 to entry is added.]
530.3.36
open circuit voltage
U
OC
open circuit voltage of the combination wave generator at the point of connection of the device under test
[SOURCE: EN 61643-11:2012, 3.1.23]
530.3.37
two-port SPD
SPD having a specific series impedance connected between separate input and output connections
[SOURCE: EN 61643-11:2012, 3.1.3]
1.4 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.
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1.5 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 series, EN 62208 or other relevant standard like EN 61439 series.
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.
2 Devices for protection against electric shock by automatic disconnection of
supply
2.1 General
Devices for protection against electric shock by automatic disconnection of supply shall be suitable for
isolation in accordance with HD 60364-4-46:2016 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.
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.
2.2 Overcurrent protective devices
2.2.1 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.
2.2.2 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 subclause 411.4.4).
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SIST HD 60364-5-53:2022
HD 60364-5-53:2022 (E)
If for certain equipment or for certain parts of the installation, the maximum tripping time of the Table 41A
cannot be fulfilled by the overcurren
...
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