SIST EN 60255-27:2006

SLOVENSKI STANDARD
SIST EN 60255-27:2006
01-november-2006
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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
SIST EN 60255-27:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60255-27:2006

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SIST EN 60255-27:2006
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

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SIST EN 60255-27:2006
EN 60255-27:2005 - 2 -
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).
__________

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SIST EN 60255-27:2006
- 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.

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SIST EN 60255-27:2006
EN 60255-27:2005 - 4 -
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

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SIST EN 60255-27:2006
- 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

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SIST EN 60255-27:2006

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SIST EN 60255-27:2006
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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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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PRICE CODE
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МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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SIST EN 60255-27:2006
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 .123
10.2 Routine testing or sample testing .123
10.3 Conditions for testing .123
10.4 Verification procedure .125
10.5 Tests.125

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SIST EN 60255-27:2006
60255-27  IEC:2005 – 5 –
Annex A (normative) Isolation class requirements and example diagrams.151
Annex B (informative) Nominal voltages of supply systems .163
Annex C (normative) Rated impulse voltages.165
Annex D (normative) Guidance for the determination of clearance, creepage distance
and withstand voltages .167
Annex E (informative) Measurement of creepage distances and clearances.189
Annex F (normative) Standard test fingers .201
Annex G (informative) Guidance for impulse voltage test .205
Annex H (informative) Components.209
Annex I (informative) Safe maximum short-term voltage duration and capacitor size
under a single-fault condition .217
Annex J (informative) External wiring terminations.221
Annex K (informative) Examples of battery protection .225
Annex L (informative) Reasons why functional safety is excluded from the scope of
IEC 60255-27 .227

Figure 1 – Flow chart showing requirements for protection against the spread of fire .71
Figure 2 – Baffle .87
Figure 3 – Location and extent of a non-combustible flame barrier.87
Figure A.1 – Equipment with SELV input/output (I/O) .157
Figure D.1 – Guidance for determination of clearances, creepage distances and
withstand voltages .175
Figure F.1 – Rigid test finger.201
Figure F.2 – Jointed test finger .203
Figure G.1 – Impulse voltage test generator assembly schematic diagram.207
Figure I.1 – Maximum duration of short-term temporary accessible voltages under a
single-fault condition.217
Figure I.2 – Charged capacitance level under normal operational use and single-fault
condition.219
Figure K.1 – Non-rechargeable battery protection .225
Figure K.2 – Rechargeable battery protection .225
Figure L.1 – Simplified block diagram showing a protective relay which can actuate a
circuit-breaker to open it, the disconnected live line being subsequently rendered safe
by earthing.231
Figure L.2 – Live lines isolated by isolators mechanically or electro-mechanically
linked to the circuit-breaker, the disconnected live line being subsequently rendered
safe by earthing .231

Table 1 – Current levels in normal operational condition .45
Table 2 – Charge or energy of capacitance levels in normal operational condition .45
Table 3 – Current levels in single-fault condition.65
Table 4 – Maximum temperature in normal operational use and at an ambient
temperature of 40°C .73
Table 5 – Acceptable perforation in the bottom of an equipment case .87

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SIST EN 60255-27:2006
60255-27  IEC:2005 – 7 –
Table 6 – Insulation material of windings .89
Table 7 – Limits of maximum available current.91
Table 8 – Overcurrent protective device.93
Table 9 – Symbols .109
Table 10 – Symbols for marking of test voltage(s).111
Table 11 – Overview of tests.121
Table 12 – Dry-heat test – Operational .125
Table 13 – Cold test – operational .127
Table 14 – Dry heat test, storage temperature .129
Table 15 – Cold test, storage temperature .129
Table 16 – Damp-heat test.131
Table 17 – Cyclic temperature with humidity test .131
Table 18 – Guidance for routine and sample dielectric voltage testing for safety –
informative.141
Table 19 – AC test voltages .143
Table A.1 – Circuit isolation class for product circuits/groups.151
Table A.2 – Insulation requirement between any two circuits .155
Table B.1 – Nominal voltages of a.c. or d.c. supply systems .163
Table C.1 – Rated impulse voltages (waveform: 1,2/50µs) .165
Table D.1 – Functional insulation, pollution degree 1, overvoltage category I.177
Table D.2 – Functional insulation, pollution degree 2, overvoltage category I.179
Table D.3 – Functional, basic or supplementary insulation, pollution degree 1,
overvoltage category II .179
Table D.4 – Functional, basic or supplementary insulation, pollution degree 2,
overvoltage category II .181
Table D.5 – Functional, basic or supplementary insulation, pollution degree 1,
overvoltage category III .181
Table D.6 – Functional, basic or supplementary insulation, pollution degree 2,
overvoltage category III .183
Table D.7 – Double or reinforced insulation, pollution degree 1, overvoltage category II .183
Table D.8 – Double or reinforced insulation, pollution degree 2, overvoltage category II .185
Table D.9 – Double or reinforced insulation, pollution degree 1, overvoltage category III .185
Table D.10 – Double or reinforced insulation, pollution degree 2, overvoltage category III .187
Table D.11 – Test voltage multiplication factor for proving the clearance in air .187
Table D.12 – Reduction of the pollution degree of internal environment through the use
of additional protection within the equipment .187
Table E.1 – Width X of groove as a function of pollution degree.189
Table G.1 – Components of the test generator.205
Table J.1 – Range of conductor sizes to be accepted by terminals.223
Table J.2 – Sizes of terminal studs or screws directly securing supply conductors .223

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SIST EN 60255-27:2006
60255-27  IEC:2005 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MEASURING RELAYS AND PROTECTION EQUIPMENT –

Part 27: Product safety requirements


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60255-27 has been prepared by IEC technical committee 95:
Measuring relays and protection equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
95/180/FDIS 95/182/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN 60255-27:2006
60255-27  IEC:2005 – 11 –
IEC 60255 consists of the following parts, under the general title Measuring relays and
protection equipment:
Part 3: Single input energizing quantity measuring relays with dependent or independent
time
Part 5: Insulation coordination for measuring relays and protection equipment –
Requirements and tests
Part 6: Measuring relays and protection equipment
Part 8: Thermal electrical relays
Part 11: Interruptions to and alternating component (ripple) in d.c. auxiliary energizing
quantity of measuring relays
Part 12: Directional relays and power relays with two input energizing quantities
Part 13: Biased (percentage) differential relays
Part 16: Impedance measuring relays
Part 21-1: Vibration, shock, bump and seismic tests on measuring relays and protection
equipment – Section One: Vibration tests (sinusoidal)
Part 21-2: Vibration, shock, bump and seismic tests on measuring relays and protection
equipment – Section Two: Shock and bump tests
Part 21-3: Vibration, shock, bump and seismic tests on measuring relays and protection
equipment – Section 3: Seismic tests
Part 22-1: Electrical disturbance t
...