HD 60364-5-557:2013

SLOVENSKI STANDARD
01-februar-2014
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Low-voltage electrical installations - Part 5-557: Selection and erection of electrical
equipment - Auxiliary circuits
Ta slovenski standard je istoveten z: HD 60364-5-557:2013
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONIZATION DOCUMENT
HD 60364-5-557
DOCUMENT D'HARMONISATION
December 2013
HARMONISIERUNGSDOKUMENT
ICS 91.140
English version
Low-voltage electrical installations -
Part 5-557: Selection and erection of electrical equipment -
Auxiliary circuits
(IEC 60364-5-55:2011/A1:2012 (Clause 557))

Installations électriques à basse tension -  Errichten von Niederspannungsanlagen -
Partie 5-557: Choix et mise en œuvre des Teil 5-557: Auswahl und Errichtung
matériels électriques - elektrischer Betriebsmittel -
Circuits auxiliaires Hilfsstromkreise
(CEI 60364-5-55:2011/A1:2012 (IEC 60364-5-55:2011/A1:2012
(Article 557)) (Abschnitt 557))

This Harmonization Document was approved by CENELEC on 2013-10-16. 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, 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.

CENELEC
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

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. HD 60364-5-557:2013 E

Foreword
The text of document 64/1831/FDIS, future IEC 60364-5-55:2011/A1:2012 (Clause 557), prepared by
IEC/TC 64 "Electrical installations and protection against electric shock" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as HD 60364-5-557:2013.
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2014-07-16
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2016-10-16
the document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60364-5-55:2011/A1:2012 (Clause 557) was approved by
CENELEC as a European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60079 NOTE Harmonized in EN 60079 series.
IEC 60155:1993 NOTE Harmonized as EN 60155:1995 (not modified).
IEC 60204 NOTE Harmonized in EN 60204 series.
IEC 60309 NOTE Harmonized in EN 60309 series.
IEC 60332-1-1:2004 NOTE Harmonized as EN 60332-1-1:2004 (not modified).
IEC 60332-1-2:2004 NOTE Harmonized as EN 60332-1-2:2004 (not modified).
IEC 60364-1:2008
NOTE Harmonized as HD 60364-1:2008 (modified)
IEC 60364-5-52:2009
NOTE Harmonized as HD 60364-5-52:2011 (modified)
IEC 60598-1:2008 NOTE Harmonized as EN 60598-1:2008 (modified)
IEC 60598-2-14 NOTE Harmonized as EN 60598-2-14.
IEC 61140 NOTE Harmonized as EN 61140.
IEC 61241 NOTE Harmonized in EN 61241 series.

- 3 - HD 60364-5-557:2013
IEC 61347-1:2007 NOTE Harmonized as EN 61347-1:2008 (modified)
IEC 61508-4:2010 NOTE Harmonized as EN 61508-4:2010 (not modified).
IEC 61557-12 NOTE Harmonized as EN 61557-12.
IEC 61558-2-6:2009 NOTE Harmonized as EN 61558-2-6:2009 (not modified).
IEC 61936 NOTE Harmonized in EN 61936 series.
IEC 61995 NOTE Harmonized in EN 61995 series

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE  When an international publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60038 - IEC standard voltages EN 60038 -
IEC 60364 series Electrical installations of buildings / HD 384 / series
Low-voltage electrical installations HD 60364
IEC 60364-1 (mod) 2005 Low-voltage electrical installations HD 60364-1 2008
+ corr. August 2009 Part 1: Fundamental principles,
assessment of general characteristics,
definitions
IEC 60364-4-41 (mod) 2005 Low-voltage electrical installations HD 60364-4-41 2007
Part 4-41: Protection for safety - + corr. July 2007
Protection against electric shock
IEC 60364-4-42 - Low voltage electrical installations HD 60364-4-42 -
Part 4-42: Protection for safety -
Protection against thermal effects
IEC 60364-4-43 (mod) 2008 Low voltage electrical installations HD 60364-4-43 2010
+ corr. October 2008 Part 4-43: Protection for safety -
Protection against overcurrent
IEC 60364-4-44 2007 Low-voltage electrical installations - -
Part 4-44: Protection for safety -
Protection against voltage disturbances
and electromagnetic disturbances
IEC 60364-5-52 (mod) 2009 Low-voltage electrical installations HD 60364-5-52 2011
+ corr. February 2011 Part 5-52: Selection and erection of
electrical equipment - Wiring systems
IEC 60364-5-53 2001 Electrical installations of buildings - -
Part 5-53: Selection and erection of
electrical equipment - Isolation,
switching and control
IEC 60364-7-712 - Electrical installations of buildings HD 60364-7-712 -
Part 7-712: Requirements for special
installations or locations - Solar
photovoltaic (PV) power supply systems
IEC 60364-7-717 - Low-voltage electrical installations HD 60364-7-717 -
Part 7-717: Requirements for special
installations or locations - Mobile or
transportable units
- 5 - HD 60364-5-557:2013
IEC 61439-1 2011 Low-voltage switchgear and controlgear EN 61439-1 2011
assemblies
Part 1: General rules
IEC 61508 series Functional safety of EN 61508 series
electrical/electronic/programmable
electronic safety-related systems
IEC 61557-8 - Electrical safety in low voltage EN 61557-8 -
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 61557-9 - Electrical safety in low voltage EN 61557-9 -
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 60364-5-55 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Electrical installations of buildings –

Part 5-55: Selection and erection of electrical equipment – Other equipment

Installations électriques des bâtiments –

Partie 5-55: Choix et mise en oeuvre des matériels électriques – Autres matériels

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX L
ICS 91.140 ISBN 978-2-83220-395-8

– 2 – 60364-5-55 Amend.1 © IEC:2012
FOREWORD
This amendment has been prepared by IEC technical committee 64: Electrical installations
and protection against electric shock.
The text of this amendment is based on the following documents:
FDIS Report on voting
64/1831/FDIS 64/1863/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base 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.
_____________
Insert the following new references into Clause 550.2, Normative references:
IEC 60038, IEC standard voltages
IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60364-5-52:2009, Low-voltage electrical installations – Part 5-52: Selection and erection
of electrical equipment – Wiring systems
IEC 61439-1:2011, Low-voltage switchgear and controlgear assemblies – Part 1: General
rules
IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
safety-related systems
IEC 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 61557-9, 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
Replace "IEC 60364-4-43" by "IEC 60364-4-43:2008.
Insert the following new Clause 557 after Clause 551.8 and before Clause 559:

60364-5-55 Amend.1 © IEC:2012 – 3 –
557 Auxiliary circuits
557.1 Scope
This clause applies to auxiliary circuits, except those covered by specific product or system
standards.
557.2 Terms and definitions
For the purposes of this document, the following definitions apply.
NOTE For general definitions, see IEC 60050-826.
557.2.1
auxiliary circuit
circuit for transmission of signals intended for control, detection, supervision or measurement
of the functional status of a main circuit
557.2.2
main circuit
circuit containing electrical equipment for generation, conversion, distribution or switching of
electrical power or current-using equipment
557.2.3
current-limiting signal output
signal output provided by a device which serves to limit the current
557.2.4
inherently short-circuit and earth fault proof
state of an electric equipment or assembly protected against short-circuits and earth faults by
suitable design and erection provisions
[SOURCE: IEC 60050-826:2004, definition 826-14-15]
557.2.5
safety integrity level
SIL
discrete level for specifying the safety integrity requirements of the safety functions to be
allocated to the electrical/electronic/programmable electronic safety-related systems, where
safety integrity level 4 has the highest level of safety integrity and safety integrity level 1 has
the lowest
[SOURCE: IEC 61508-4:2010, 3.5.8, modified]
557.3 Requirements for auxiliary circuits
557.3.1 General
The power supply a.c. or d.c. for an auxiliary circuit may be either dependent or independent
of the main circuit according to its required function. If the status of the main circuit has to be
signaled, then the signaling circuit shall be able to operate independently of that main circuit.
NOTE In extensive installations the use of a d.c. auxiliary supply may be preferred.
557.3.2 Power supply for auxiliary circuits dependent on the main circuit
557.3.2.1 General
Auxiliary circuits with a power supply dependent on the main a.c. circuit shall be connected to
the main circuit:
– 4 – 60364-5-55 Amend.1 © IEC:2012
– directly (see Figure 557.1); or
– via a rectifier (see Figure 557.2); or
– via transformer (see Figure 557.3).
It is recommended that auxiliary circuits supplying primarily electronic equipment or systems
should not be supplied directly but at least via simple separation from the main circuit.
L1
L2
L3
N
Terminals for the
auxiliary circuit
IEC  1802/12
Figure 557.1 – Auxiliary circuit supplied directly from the main circuit

L1
L2
L3
N
Terminals for the
auxiliary circuit
+ –
IEC  1803/12
Figure 557.2 – Auxiliary circuit supplied via rectifier from the main circuit

L1
L2
L3
N
Terminals for the
auxiliary circuit
IEC  1804/12
Figure 557.3 – Auxiliary circuit supplied from the main circuit via transformer
NOTE In the case of an auxiliary circuit supplied from the main circuit, directly or via the rectifier, the auxiliary
circuit begins at the connection point to the main circuit, see Figure 557.1. When via the rectifier, see Figure 557.2,
or by a transformer supply, see Figur
...