EN 60255-27:2005

Measuring relays and protection equipment - Part 27: Product safety requirements

Describes the product safety requirements for measuring relays and protection equipment having a rated a.c. voltage up to 1 000 V with a rated frequency up to 65 Hz, or a rated d.c. voltage up to 1 500 V. Details essential safety requirements to minimize the risk of fire and hazards caused by electric shock or injury to the user. The contents of the corrigendum of March 2007 have been included in this copy.

Messrelais und Schutzeinrichtungen - Teil 27: Anforderungen an die Produktsicherheit

Relais de mesure et dispositifs de protection - Partie 27: Exigences de sécurité

Décrit les exigences de sécurité pour les relais de mesure et dispositifs de protection dont la tension nominale n'excède pas 1 000 V c.a. avec une fréquence nominale jusqu'à 65 Hz ou 1 500 V c.c. Détaille les exigences fondamentales de sécurité pour minimiser le risque d'incendie et le danger de choc électrique ou de blessure pour l'utilisateur. Le contenu du corrigendum de mars 2007 a été pris en considération dans cet exemplaire.

Merilni releji in zaščitna oprema - 27. del: Zahteve za varnost izdelka (IEC 60255-27:2005)

General Information

• Status: Withdrawn
• Publication Date: 05-Dec-2005
• Withdrawal Date: 31-Oct-2008
• ICS: 29.120.70 - Relays
• Technical Committee: CLC/TC 95X - Measuring relays and protection equipment
• Drafting Committee: IEC/TC 95 - IEC_TC_95
• Parallel Committee: IEC/TC 95 - IEC_TC_95
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 19-Nov-2016
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive: 2014/53/EU - Directive 2014/53/EU of The European Parliament and of the Council of 16 April 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC
• Directive: 73/23/EEC - Electrical equipment designed for use within certain voltage limits
• Ref Project: SIST EN 60255-27:2006 - Measuring relays and protection equipment -- Part 27: Product safety requirements

Relations

• Replaced By: EN 60255-27:2014 - Measuring relays and protection equipment - Part 27: Product safety requirements
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2006
0HULOQLUHOHMLLQ]DãþLWQDRSUHPDGHO=DKWHYH]DYDUQRVWL]GHOND,(&

Measuring relays and protection equipment -- Part 27: Product safety requirements
Messrelais und Schutzeinrichtungen -- Teil 27: Anforderungen an die Produktsicherheit
Relais de mesure et dispositifs de protection -- Partie 27: Exigences de sécurité
Ta slovenski standard je istoveten z: EN 60255-27:2005
ICS:
29.120.70 Releji Relays
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60255-27
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2005

ICS 29.120.70
English version
Measuring relays and protection equipment
Part 27: Product safety requirements
(IEC 60255-27:2005)
Relais de mesure  Messrelais und Schutzeinrichtungen
et dispositifs de protection Teil 27: Anforderungen
Partie 27: Exigences de sécurité an die Produktsicherheit
(CEI 60255-27:2005) (IEC 60255-27:2005)

This European Standard was approved by CENELEC on 2005-11-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60255-27:2005 E
Foreword
The text of document 95/180/FDIS, future edition 1 of IEC 60255-27, prepared by IEC TC 95,
Measuring relays and protection equipment, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 60255-27 on 2005-11-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-11-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60255-27:2005 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 60068-3-4 NOTE Harmonized as EN 60068-3-4:2002 (not modified).
IEC 60112 NOTE Harmonized as EN 60112:2003 (not modified).
IEC 60255-5 NOTE Harmonized as EN 60255-5:2001 (not modified).
IEC 60695-2-13 NOTE Harmonized as EN 60695-2-13:2001 (not modified).
IEC 61010-1 NOTE Harmonized as EN 61010-1:2001 (not modified).
IEC 61508-1 NOTE Harmonized as EN 61508-1:2001 (not modified).
IEC 61558 NOTE Harmonized in EN 61558 series (modified).
IEC 61810-1 NOTE Harmonized as EN 61810-1:2004 (not modified).
__________
- 3 - EN 60255-27:2005
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60068-2-1 1990 Environmental testing EN 60068-2-1 1993
Part 2: Tests - Tests A: Cold
1)
IEC 60068-2-2 1974 Part 2-2: Tests - Tests B: Dry heat EN 60068-2-2 1993
A1 1993 A1 1993
A2 1994 A2 1994
2)
IEC 60068-2-30 1980 Part 2-30: Tests - Test Db and EN 60068-2-30 1999
guidance: Damp heat, cyclic (12 + 12-
hour cycle)
IEC 60068-2-78 2001 Part 2-78: Tests - Test Cab: Damp heat, EN 60068-2-78 2001
steady state
IEC 60085 2004 Electrical insulation - Thermal EN 60085 2004
classification
IEC 60127-1 1988 Miniature fuses
+ corr. March 1990 Part 1: Definitions for miniature fuses EN 60127-1 1991
and general requirements for miniature
fuse-links
IEC 60255-6 1988 Electrical relays EN 60255-6 1994
(mod) Part 6: Measuring relays and protection + corr. February 1995
equipment
IEC 60255-21-1 1988 Part 21: Vibration, shock, bump and EN 60255-21-1 1995
seismic tests on measuring relays and
protection equipment
Section 1: Vibration tests (sinusoidal)

IEC 60255-21-2 1988 Part 21: Vibration, shock, bump and EN 60255-21-2 1995
seismic tests on measuring relays and
protection equipment
Section 2: Shock and bump tests

1)
EN 60068-2-2 includes supplement A:1976 to IEC 60068-2-2.
2)
EN 60068-2-30 includes A1:1985 to IEC 60068-2-30.

Publication Year Title EN/HD Year
IEC 60255-21-3 1993 Part 21: Vibration, shock, bump and EN 60255-21-3 1995
seismic tests on measuring relays and
protection equipment
Section 3: Seismic tests
IEC 60255-22-5 2002 Part 22-5: Electrical disturbance tests EN 60255-22-5 2002
for measuring relays and protection
equipment - Surge immunity test

IEC 60352-1 1997 Solderless connections EN 60352-1 1997
Part 1: Wrapped connections - General
requirements, test methods and
practical guidance
IEC 60352-2 1990 Part 2: Solderless crimped connections EN 60352-2 1994
- General requirements, test methods
and practical guidance
IEC 60417 data Graphical symbols for use on - -
base equipment
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993
A1 1999 A1 2000
IEC 60664-1 1992 Insulation coordination for equipment
+ A1 2000 within low-voltage systems
+ A2 2002 Part 1: Principles, requirements and EN 60664-1 2003
tests
IEC 60664-3 2003 Part 3: Use of coating, potting or EN 60664-3 2003
moulding for protection against pollution

IEC/TS 60695-2-20 2004 Fire hazard testing - -
Part 2-20: Glowing/hot wire based test
methods - Hot-wire coil ignitability -
Apparatus, test method and guidance

IEC 60695-11-10 1999 Part 11-10: Test flames - 50 W EN 60695-11-10 1999
A1 2003 horizontal and vertical flame test A1 2003
methods
IEC 60825-1 1993 Safety of laser products EN 60825-1 1994
Part 1: Equipment classification, + corr. February 1995
A1 1997 requirements and user's guide A1 2002
A2 2001 A2 2001
+ corr. April 2004
IEC 60990 1999 Methods of measurement of touch EN 60990 1999
current and protective conductor current

IEC 61140 2001 Protection against electric shock - EN 61140 2002
Common aspects for installation and
equipment
- 5 - EN 60255-27:2005
Publication Year Title EN/HD Year
IEC 61180-1 1992 High-voltage test techniques for low- EN 61180-1 1994
voltage equipment
Part 1: Definitions, test and procedure
requirements
IEC 61180-2 1994 Part 2: Test equipment EN 61180-2 1994

IEC 62151 2000 Safety of equipment electrically - -
connected to a telecommunication
network
ISO 780 1997 Packaging - Pictorial marking for EN ISO 780 1999
handling of goods
ISO 7000 data Graphical symbols for use on - -
base equipment - Index and synopsis

NORME CEI
INTERNATIONALE
IEC
60255-27
INTERNATIONAL
Première édition
STANDARD
First edition
2005-11
Relais de mesure et dispositifs de protection –
Partie 27:
Exigences de sécurité
Measuring relays and protection equipment –
Part 27:
Product safety requirements
 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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60255-27  IEC:2005 – 3 –
CONTENTS
FOREWORD.9
INTRODUCTION.15
1 Scope and object.19
2 Normative references .19
3 Terms and definitions .23
4 General safety requirements.39
4.1 Earthing requirements (grounding, earthing and screening).39
5 Protection against electric shock .39
5.1 Requirements for protection against electric shock.39
5.2 Single-fault conditions .59
6 Mechanical aspects .67
6.1 Protection against mechanical hazards.67
6.2 Mechanical requirements.67
6.3 Mechanical security of terminations.69
7 Flammability and resistance to fire .69
7.1 General .69
7.2 General hazards from overheating and fire.73
7.3 Minimization of fire risk.75
7.4 Cabling and fusing .77
7.5 Flammability of materials and components .77
7.6 Fire ignition sources .83
7.7 Conditions for a fire enclosure.83
7.8 Requirements for primary circuits and circuits exceeding ELV limits .85
7.9 Fire enclosures and flame barriers .85
7.10 Assessment of the fire risk due to a single-fault condition.87
7.11 Limited-energy circuit .91
8 General and fundamental design requirements for safety .93
8.1 Climatic conditions for safety.93
8.2 Electrical connections.93
8.3 Components .95
8.4 Connection to communication networks.95
8.5 Connection to other equipment.95
8.6 Laser sources.97
8.7 Explosion .97
9 Marking, documentation and packaging .99
9.1 Marking .99
9.2 Documentation .113
9.3 Packaging .119
10 Type tests and routine tests .121
10.1 Safety type tests .
...