Low voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear - Clause 537: Isolation and switching

This part of HD 60364 deals with general requirements for isolation and switching and with the
requirements for selection and erection of the devices provided to fulfil such functions.

Errichten von Niederspannungsanlagen - Teil 5: Auswahl und Errichtung elektrischer Betriebsmittel - Kapitel 53: Schaltgeräte und Steuergeräte - Abschnitt 537: Geräte zum Trennen und Schalten

Installations électriques basse tension - Partie 5-53: Choix et mise en œuvre des matériels - Appareillage - Article 537: Sectionnement et coupure

Nizkonapetostne električne inštalacije - 5-53. del: Izbira in namestitev električne opreme - Stikalne in krmilne naprave - 537. oddelek: Ločevanje in stikanje

Ta del standarda HD 60364 obravnava splošne zahteve za ločevanje in stikanje ter zahteve za izbiro in namestitev naprav, ki te funkcije opravljajo.

General Information

Status
Published
Public Enquiry End Date
31-Dec-2014
Publication Date
15-Dec-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Dec-2016
Due Date
13-Feb-2017
Completion Date
16-Dec-2016

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST HD 60364-5-537:2017
01-januar-2017
1DGRPHãþD
SIST HD 384.5.537 S2:2002
1L]NRQDSHWRVWQHHOHNWULþQHLQãWDODFLMHGHO,]ELUDLQQDPHVWLWHYHOHNWULþQH
RSUHPH6WLNDOQHLQNUPLOQHQDSUDYHRGGHOHN/RþHYDQMHLQVWLNDQMH
Low voltage electrical installations - Part 5-53: Selection and erection of electrical
equipment - Switchgear and controlgear - Clause 537: Isolation and switching
Errichten von Niederspannungsanlagen - Teil 5: Auswahl und Errichtung elektrischer
Betriebsmittel - Kapitel 53: Schaltgeräte und Steuergeräte - Abschnitt 537: Geräte zum
Trennen und Schalten
Installations électriques basse tension - Partie 5-53: Choix et mise en œuvre des
matériels - Appareillage - Article 537: Sectionnement et coupure
Ta slovenski standard je istoveten z: HD 60364-5-537:2016
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 60364-5-537:2017 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST HD 60364-5-537:2017

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SIST HD 60364-5-537:2017


HARMONIZATION DOCUMENT HD 60364-5-537

DOCUMENT D'HARMONISATION

HARMONISIERUNGSDOKUMENT
November 2016
ICS 29.120.50; 91.140.50 Supersedes HD 384.5.537 S2:1998
English Version
Low-voltage electrical installations -
Part 5-53: Selection and erection of electrical equipment -
Devices for protection, isolation, switching, control and
monitoring - Clause 537: Isolation and switching
Installations électriques basse tension -  Errichten von Niederspannungsanlagen -
Partie 5-53: Choix et mise en œuvre des matériels - Teil 5-53: Auswahl und Errichtung elektrischer
Appareillage - Article 537: Sectionnement et coupure Betriebsmittel - Schaltgeräte und Steuergeräte -
Abschnitt 537: Geräte zum Trennen und Schalten
This Harmonization Document was approved by CENELEC on 2016-07-04. 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
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. HD 60364-5-537:2016 E

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SIST HD 60364-5-537:2017
HD 60364-5-537:2016 (E)
Contents Page
European foreword .3
537 Devices for isolation and switching .4
537.0 Introduction .4
537.0.1 Scope .4
537.0.2 Normative references .4
537.1 General .6
537.2 Devices for isolation .6
537.3 Devices for switching .7
537.3.1 Functional switching and control devices .7
537.3.2 Switching-off devices for mechanical maintenance .7
537.3.3 Devices for emergency switching off .8
537.4 Firefighter’s switches.8
Annex A (normative) Devices for isolation and switching .9
Annex B (informative)  Firefighter’s switches . 11
Annex C (normative)  Special national conditions . 12
Annex D (informative)  A-deviations . 16

2

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SIST HD 60364-5-537:2017
HD 60364-5-537:2016 (E)
European foreword
This document (HD 60364-5-537:2016) was prepared by CLC/TC 64 “Electrical installations and
protection against electric shock”.
The following dates are fixed:
— latest date by which the document has to be implemented (dop) 2017-05-11
at national level by publication of an identical national
standard or by endorsement
— latest date by which the national standards conflicting with (dow) 2019-11-11
the document have to be withdrawn
This document supersedes HD 384.5.537 S2:1998.
HD 60364-5-537:2016 includes the following significant technical changes with respect to the previous
edition: the contents of this document has been adapted to give requirements on implementation of
the measures provided in HD 60364-4-46:2016 and requirements for proper functioning, in terms of
selection and erection of electrical equipment for isolation and switching. Another significant technical
change is the introduction of Annex A.
NOTE Complementarily, the text of HD 60364-4-46:2016 has been revised so that it only includes general
requirements on measures for isolation and switching to provide for the safety of persons, livestock and property.
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.
3

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SIST HD 60364-5-537:2017
HD 60364-5-537:2016 (E)
537 Devices for isolation and switching
537.0 Introduction
537.0.1 Scope
This part of HD 60364 deals with general requirements for isolation and switching and with the
requirements for selection and erection of the devices provided to fulfil such functions.
537.0.2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 60269 / HD 60269 / CLC/TR 60269 series, Low-voltage fuses (IEC 60269 series)
EN 60309 (series), Plugs, socket-outlets and couplers for industrial purposes (IEC 60309 series)
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 60669-2-2)
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)
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 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, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers (IEC 60947-2)
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)
4

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SIST HD 60364-5-537:2017
HD 60364-5-537:2016 (E)
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 61008-2-1, 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 61009-2-1, 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 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 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)
HD 60364-4-46:2016, Low-voltage electrical installations – Part 4-46: Protection for safety – Isolation
and switching
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
5

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SIST HD 60364-5-537:2017
HD 60364-5-537:2016 (E)
537.1 General
537.1.1 Any device for isolation and switching according to Clauses 462 to 465 of
HD 60364-4-46:2016 shall comply with the relevant requirements included in this clause.
In certain instances, additional requirements may be necessary for combined functions.
NOTE 1 Table A.1 summarizes the functions provided by the devices for isolation and switching, together with
indication of the relevant product standards.
NOTE 2 For some applications such as motor control, the switching device needs to withstand the inrush
current.
537.1.2 Where an installation or an item of equipment or enclosure contains live parts connected to
more than one supply, a durable warning notice shall be placed in such a position that any person
before gaining access to live parts, will be warned of the need to isolate those parts from the various
supplies unless an interlocking arrangement is provided to ensure that all the circuits concerned are
isolated.
537.1.3 Plugs and socket-outlets, connectors and devices for connection of luminaires may be used
for providing the isolation and switching functions in accordance with Annex A.
The isolation and switching functions are provided by the disconnection of the plug from the outlet or
connector from the inlet as applicable.
537.2 Devices for isolation
537.2.1 Devices for isolation shall be devices for which the isolation function is explicitly recognized
by the relevant product standard.
The devices providing isolation function shall be selected in accordance with Annex A.
537.2.2 Semiconductor devices shall not be used as isolating devices.
537.2.3 Devices suitable for isolation shall be selected according to the requirements that are based
on the overvoltage categories applicable at their point of installation.
Devices for isolation shall be designed for over voltage category III or IV except the plug of a plug and
socket-outlet combination identified in Table A.1 as suitable for isolation.
NOTE Examples of overvoltage categories for devices are given in HD 60364–4-443.
Devices used for isolation shall comply with 537.2.4 to 537.2.8.
537.2.4 Devices for isolation shall be selected and/or installed so as to prevent unwanted or
unintentional closure (see HD 60364-4-46:2016, 462.3).
This may be achieved by locating the device in a lockable space or lockable enclosure or by
padlocking or by other suitable means.
537.2.5 Provision shall be made for securing off-load isolating devices against unwanted or
unintentional opening.
This may be achieved, for example, by locating the device in a lockable space or lockable enclosure
or by padlocking. Alternatively, the off-load device may be interlocked with a load-breaking one.
6

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SIST HD 60364-5-537:2017
HD 60364-5-537:2016 (E)
537.2.6 Means of isolation shall preferably be provided by a multipole switching device which
disconnects all applicable poles of the relevant supply but single-pole devices situated adjacent to
each other are not excluded, subject to the provisions of HD 60364-4-46:2016, 461.2.
537.2.7 Each device used for isolation shall be clearly identified by position or durable marking to
indicate the installation or circuit it isolates.
537.2.8 Where a link is inserted in the neutral conductor for isolating purposes, the link shall comply
with the following requirements:
– it cannot be removed without the use of a tool; and
– it is accessible to skilled persons only.
537.3 Devices for switching
537.3.1 Functional switching and control devices
537.3.1.1 The devices for functional switching and control shall be selected in accordance with
Annex A.
537.3.1.2 Functional switching devices shall be suitable for the most onerous duty they are intended
to perform. The characteristic of the load to be switched shall be considered (e.g. utilization category).
537.3.1.3 Functional switching devices may control the current without necessarily opening the
corresponding poles.
NOTE Semiconductor switching devices and some control auxiliaries are examples of devices capable of
interrupting the current in the circuit but not opening the corresponding poles.
537.3.2 Switching-off devices fo
...

SLOVENSKI STANDARD
oSIST prHD 60364-5-537:2014
01-december-2014
1DGRPHãþD
SIST HD 384.5.537 S2:2002
(OHNWULþQHLQãWDODFLMH]JUDGEGHO,]ELUDLQQDPHVWLWHYHOHNWULþQHRSUHPH
6WLNDOQHLQNUPLOQHQDSUDYHRGGHOHN1DSUDYH]DORþHYDQMHLQVWLNDQMH
Low voltage electrical installations - Part 5-53: Selection and erection of electrical
equipment - Switchgear and controlgear - Clause 537: Isolation and switching
Errichten von Niederspannungsanlagen - Teil 5: Auswahl und Errichtung elektrischer
Betriebsmittel - Kapitel 53: Schaltgeräte und Steuergeräte - Abschnitt 537: Geräte zum
Trennen und Schalten
Installations électriques basse tension - Partie 5-53: Choix et mise en œuvre des
matériels - Appareillage - Article 537: Sectionnement et coupure
Ta slovenski standard je istoveten z: prHD 60364-5-537:2014
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
oSIST prHD 60364-5-537:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prHD 60364-5-537:2014

---------------------- Page: 2 ----------------------
oSIST prHD 60364-5-537:2014


HARMONIZATION DOCUMENT DRAFT
prHD 60364-5-537
DOCUMENT D'HARMONISATION

HARMONISIERUNGSDOKUMENT

August 2014
ICS 29.120.50; 91.140.50 Will supersede HD 384.5.537 S2:1998
English Version
Low voltage electrical installations - Part 5-53: Selection and
erection of electrical equipment - Switchgear and controlgear -
Clause 537: Isolation and switching
Installations électriques basse tension - Partie 5-53: Choix Errichten von Niederspannungsanlagen - Teil 5: Auswahl
et mise en œuvre des matériels - Appareillage - Article 537: und Errichtung elektrischer Betriebsmittel - Kapitel 53:
Sectionnement et coupure Schaltgeräte und Steuergeräte - Abschnitt 537: Geräte zum
Trennen und Schalten
This draft Harmonization Document is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2015-01-23.

It has been drawn up by CLC/TC 64.

If this draft becomes a Harmonization Document, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for implementation of this Harmonization Document on a national level.

This draft Harmonization Document was established by CENELEC 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a Harmonization Document. It is distributed for review and comments. It is subject to change without notice
and shall not be referred to as a Harmonized Document.


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
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 25363 Ref. No. prHD 60364-5-537:2014 E

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oSIST prHD 60364-5-537:2014
prHD 60364-5-537:2014 - 2 -
1 Foreword
2 This document (prHD 60364-5-537:2014) was prepared by CLC/TC 64 “Electrical installations
3 and protection against electric shock”.
4
5 This document is currently submitted to the enquiry.
6
7 This document will supersede HD 384.5.537 S2:1998.
8
9 Secretary note: During its last plenary meeting, CLC/TC 64 took the following decision:
10 WG7 has prepared a first draft of the revision of HD 60364-5-537 that is now submitted to the National Committees
11 as first enquiry.
12
13 The text of this first enquiry of prHD 60364-5-537 has been kept separated from the prHD 60364-4-46 since the
14 present structure of HD 60364 is to be kept unchanged until TC 64 decides otherwise.
15 Also, taking into account that in the next CLC/TC 64 plenary meeting TC 64 may decide to integrate
16 prHD 60364-4-46 into prHD 60364-5-537, this project is presented separated from the general project
17 prHD 60364-5-53 (project 24327).
18

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oSIST prHD 60364-5-537:2014
- 3 - prHD 60364-5-537:2014

19 537 Isolation and switching
20 537.1 General
21 537.1.1 Any device for isolation and switching according to Sections 462 to 465 shall comply
22 with the relevant requirements included in this clause.
23 General and common requirements of Clause 530.4 apply.
24 NOTE 1  In certain instances, additional requirements may be necessary for combined functions.
25 NOTE 2  The Table A.1 of the Annex A summarizes the functions provided by the devices for isolation and
26 switching, together with indication of the relevant product standards.
27 NOTE 3  For some applications such as motor control, the switching equipment needs to withstand the inrush
28 current.
29
30 537.1.2 Where an installation or an item of equipment or enclosure contains live parts
31 connected to more than one supply, a durable warning notice shall be placed in such a
32 position that any person before gaining access to live parts, will be warned of the need to
33 isolate those parts from the various supplies unless an interlocking arrangement is provided
34 to ensure that all the circuits concerned are isolated.
35 537.2 Devices for Isolation
36 Selection and erection of devices for isolation shall be in accordance with the following
37 subclauses.
38 537.2.1 Devices for isolation shall be devices for which the isolation function is explicitly
39 recognized by the relevant product standard.
40 The suitability for isolation is indicated in:
41 – the manufacturer’s instructions; and/or
42 – by the vertical line used in the following symbol marked on the product.
43
44 NOTE  The symbol might be combined with other markings depending on the functionality of the device.
45
46 537.2.2 The devices providing isolation function shall be selected in accordance with
47 Annex A.
48 537.2.3 Semiconductor devices shall not be used as isolating devices.
49 537.2.4 Devices suitable for isolation shall be selected according to the requirements which
50 are based on the overvoltage categories applicable at their point of installation.
51 Only equipment classified for over voltage category III or IV, shall be used for isolation except
52 the plug of a plug and socket-outlet identified in Table A.1 as suitable for isolation.
53 NOTE 1  Examples of overvoltage categories for devices are given in Section 443 of Part 4-44.
54 Equipment used for isolation shall comply with 537.2.5 to 537.2.9.
55 537.2.5 Devices for isolation shall be designed and/or installed so as to prevent unintentional
56 or inadvertent closure (see 462.3).
57 537.2.6 Provision shall be made for securing off-load isolating devices against inadvertent
58 and unauthorized opening.
59 This may be achieved by locating the device in a lockable space or enclosure or by
60 padlocking. Alternatively, the off-load device may be interlocked with a load-breaking one.
61 537.2.7 Means of isolation shall preferably be provided by a multipole switching device which
62 disconnects all poles of the relevant supply but single-pole devices situated adjacent to each
63 other are not excluded, subject to the provisions of 461.2.

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oSIST prHD 60364-5-537:2014
prHD 60364-5-537:2014 - 4 -
64 537.2.8 Each device used for isolation shall be clearly identified by position or durable
65 marking to indicate the installation or circuit it isolates.
66 537.2.9 Where a link is inserted in the neutral conductor for isolating purposes, the link shall
67 comply with either or both of the following requirements:
68 – It cannot be removed without the use of a tool;
69 – It is accessible to skilled persons only.
70
71 537.3 Devices for switching
72 537.3.1 Functional switching and control devices
73 Selection and erection of devices for functional switching and control shall be in accordance
74 with the following subclauses.
75 537.3.1.1 The devices for functional switching and control shall be selected in accordance
76 with Annex A.
77 537.3.1.2 Functional switching devices shall be suitable for the most onerous duty they are
78 intended to perform. The characteristic of the load to be switched shall be considered (e.g.
79 utilization category).
80 537.3.1.3 Functional switching devices may control the current without necessarily opening
81 the corresponding poles.
82 NOTE  Semiconductor switching devices and some control auxiliaries are examples of devices capable of
83 interrupting the current in the circuit but not opening the corresponding poles.
84
85 537.3.2 Switching-off devices for mechanical maintenance
86 Selection and erection of devices for Switching-off for mechanical maintenance shall be in
87 accordance with the following subclauses.
88 537.3.2.1 Devices for switching-off for mechanical maintenance shall be inserted in the supply
89 circuit.
90 Where switches are provided for this purpose, they shall be capable of cutting off the full load
91 current of the relevant part of the installation. They need not necessarily interrupt the neutral
92 conductor.
93 Interruption of a control circuit of a drive is permitted only where a condition equivalent to the
94 direct interruption of the main supply is provided by one of the following:
95 – supplementary safeguards, such as mechanical restrainers, or
96 – compliance with the requirements of a CENELEC specification for the control devices
97 used.
98 NOTE  Switching-off for mechanical maintenance may be achieved, for example, by means of:
99 - multipole switches;
100 - circuit-breakers;
101 - control and protective switching devices (CPS);
102 - plugs and sockets.

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...

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