EN 61112:2009
(Main)Live working - Electrical insulating blankets
Live working - Electrical insulating blankets
IEC 61112:2009 is applicable to electrical insulating blankets for the protection of workers from accidental contact with live or earthed electrical conductors, apparatus or circuits and avoidance of short circuits on electrical installations. This second edition cancels and replaces the first edition, published in 1992, and its Amendment 1 (2002). This edition constitutes a technical revision. It includes the following significant technical changes from the previous edition: - general review of the requirements and test provisions; - limitation of the scope in terms of the minimum width of electrical insulating blankets in rolls; - preparation of the elements of evaluation of defects, and general application of IEC 61318 Ed.3; - revision of existing annexes; - deletion of Annexes D and F, not applicable according to IEC 61318 Ed.3; - introduction of a new normative Annex F on classification of defects.
Arbeiten unter Spannung - Elektrisch isolierende Abdecktücher
Travaux sous tension - Nappes isolantes électriques
La CEI 61112:2009 est applicable aux nappes isolantes électriques pour la protection des travailleurs contre un contact accidentel avec des conducteurs électriques sous tension ou mis à la terre, des appareils ou des circuits, et contre les courts-circuits dans des installations électriques. Cette édition annule et remplace la première édition publiée en 1992 ainsi que son Amendement 1 (2002), et constitue une révision technique. Elle inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - la révision générale des exigences et des dispositions d'essai; - la limitation de l'étendue du domaine d'application en ce qui a trait à la largeur minimale des nappes isolantes électriques en rouleaux; - la préparation des éléments d'évaluation des défauts et de l'application générale de la CEI 61318 Ed.3; - la révision des annexes existantes; - la disparition des Annexe D et F qui ne sont plus applicables, en accord avec la CEI 61318 Ed.3; - l'introduction d'une nouvelle Annexe F normative traitant de la classification des défauts.
Delo pod napetostjo - Pregrinjala za električno izolacijo (IEC 61112:2009)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2009
1DGRPHãþD
SIST-TS CLC/TS 61112:2007
'HORSRGQDSHWRVWMR3UHJULQMDOD]DHOHNWULþQRL]RODFLMR ,(&
Live working - Electrical insulating blankets
Arbeiten unter Spannung – Elektrisch isolierende Abdecktücher
Travaux sous tension - Nappes isolantes électriques
Ta slovenski standard je istoveten z: EN 61112:2009
ICS:
13.260 9DUVWYRSUHGHOHNWULþQLP Protection against electric
XGDURP'HORSRGQDSHWRVWMR shock. Live working
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 61112
NORME EUROPÉENNE
June 2009
EUROPÄISCHE NORM
ICS 13.260; 29.240.20; 29.260.99 Supersedes CLC/TS 61112:2006
English version
Live working -
Electrical insulating blankets
(IEC 61112:2009)
Travaux sous tension - Arbeiten unter Spannung -
Nappes isolantes électriques Elektrisch isolierende Abdecktücher
(CEI 61112:2009) (IEC 61112:2009)
This European Standard was approved by CENELEC on 2009-06-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61112:2009 E
Foreword
The text of document 78/785/FDIS, future edition 2 of IEC 61112, prepared by IEC TC 78, Live working,
was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61112 on
2009-06-01.
This European Standard supersedes CLC/TS 61112:2006.
– general review of the requirements and test provisions;
– limitation of the scope in terms of the minimum width of electrical insulating blankets in rolls;
– introduction of a definition of electrical insulating blankets including sheeting in various shapes and in
rolls;
– introduction of Class 00;
– withdrawal of category S and introduction of category R;
– clarification of the way electrical insulating blankets in rolls are covered by the test procedures;
– specification of standard and alternative types of electrodes for the proof test;
– modification of the test procedures for low and extremely low temperature by replacing the dielectric
proof test by a withstand test in the sanction;
– modification of the test procedures for acid and oil resistance by specifying the use of test pieces and
by replacing the dielectric proof test by a withstand test in the sanction;
– specification of liquid 102 for the oil resistance test and harmonisation of the mechanical test sanction
with the acid resistance test;
– preparation of the elements of evaluation of defects, and general application of EN 61318:2008;
– revision of existing annexes;
– deletion of Annexes D and F, not applicable according to EN 61318:2008;
– introduction of a new normative Annex F on classification of defects.
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) 2010-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-06-01
Annex ZA has been added by CENELEC.
__________
- 3 - EN 61112:2009
Endorsement notice
The text of the International Standard IEC 61112:2009 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60743 NOTE Harmonized as EN 60743:2001 + A1:2008 (not modified).
+ A1
__________
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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60060-1 - High-voltage test techniques - HD 588.1 S1 1991
Part 1: General definitions and test
requirements
1) 2)
IEC 60060-2 - High-voltage test techniques - EN 60060-2 1994
Part 2: Measuring systems
1) 2)
IEC 60068-1 - Environmental testing - EN 60068-1 1994
Part 1: General and guidance
IEC 60212 1971 Standard conditions for use prior to and HD 437 S1 1984
during the testing of solid electrical insulating
materials
IEC 60417 Data- Graphical symbols for use on equipment - -
base
1) 2)
IEC 61318 - Live working - Conformity assessment EN 61318 2008
applicable to tools, devices and equipment
1) 2)
IEC 61477 - Live working - Minimum requirements for the EN 61477 2009
utilization of tools, devices and equipment
1) 2)
ISO 2592 - Determination of flash and fire points - EN ISO 2592 2001
Cleveland open cup method
1)
ISO 2977 - Petroleum products and hydrocarbon - -
solvents - Determination of aniline point and
mixed aniline point
1) 2)
ISO 3104 - Petroleum products - Transparent and EN ISO 3104 1996
opaque liquids - Determination of kinematic
viscosity and calculation of dynamic viscosity
ASTM D 3767 2003 Standard Practice for Rubber - Measurement - -
of Dimensions
1)
Undated reference.
2)
Valid edition at date of issue.
IEC 61112 ®
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Live working – Electrical insulating blankets
Travaux sous tension – Nappes isolantes électriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 13.260; 29.240.20; 29.260.99 ISBN 2-8318-1036-5
– 2 – 61112 © IEC:2009
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 Requirements .9
4.1 General .9
4.2 Classification.9
4.3 Physical requirements .9
4.3.1 Composition .9
4.3.2 Shape and design.9
4.3.3 Dimensions and tolerances.11
4.3.4 Workmanship and finish .11
4.4 Mechanical, climatic and environmental requirements .12
4.5 Dielectric requirements.12
4.6 Marking .12
4.7 Packaging .13
4.8 Instructions for use.13
5 Tests .13
5.1 General .13
5.2 Visual inspection and measurements.14
5.2.1 General .14
5.2.2 Classification.14
5.2.3 Composition .14
5.2.4 Dimensions, workmanship and finish .14
5.2.5 Thickness .14
5.3 Marking .15
5.3.1 Visual inspection and measurement .15
5.3.2 Durability of marking.15
5.4 Packaging and instructions for use .15
5.5 Mechanical tests .15
5.5.1 General .15
5.5.2 Tensile strength and elongation at break .15
5.5.3 Mechanical puncture resistance.16
5.5.4 Tension set for elastomer material.18
5.5.5 Tear resistance test for plastic material .18
5.6 Dielectric tests .19
5.6.1 General .19
5.6.2 Electrodes .20
5.6.3 Test equipment.22
5.6.4 Electrical test procedure .23
5.7 Ageing tests .24
5.8 Thermal tests .25
5.8.1 Flame retardance test.25
5.8.2 Low temperature folding test (except for category C blankets) .26
6 Tests on electrical insulating blankets with special properties.27
61112 © IEC:2009 – 3 –
6.1 General .27
6.2 Category A: Acid resistance .27
6.3 Category H: Oil resistance.27
6.4 Category Z: Ozone resistance .27
6.4.1 General .27
6.4.2 Test methods.28
6.5 Category M: Mechanical puncture resistance.29
6.6 Category C: Extremely low temperature folding test .29
7 Conformity assessment of electrical insulating blankets having completed the
production phase.29
8 Modifications .30
Annex A (informative) Guidelines for the selection of the class of electrical insulating
blankets in relation to nominal voltage of a system .31
Annex B (informative) In-service care and testing .32
Annex C (normative) Suitable for live working ; double triangle (IEC 60417-5216
(2002-10)).34
Annex D (normative) General type test procedure.35
Annex E (normative) Liquid for tests on electrical insulating blankets of category H –
Oil resistance.38
Annex F (normative) Classification of defects and tests to be allocated .39
Bibliography.40
Figure 1 – Example of plain design .10
Figure 2 – Example of slotted design .10
Figure 3 – Plan view of the dumb-bell test piece .16
Figure 4 – Test plates and needle for resistance to mechanical puncture.17
Figure 5 – Tear resistance test .19
Figure 6 – Test set-up for voltage proof test of electrical insulating blankets with
standard type of electrodes.20
Figure 7 – Test set-up for voltage proof test of electrical insulating blankets with
alternative type of electrodes .22
Figure 8 – Test set-up for voltage withstand test.23
Figure 9 – Test set-up for low and extremely low temperature folding tests.26
Figure 10 – Ozone resistance – Method B test set-up .28
Table 1 – Special properties .9
Table 2 – Common lengths and widths for electrical insulating blankets.11
Table 3 – Maximum thickness for electrical insulating blankets .11
Table 4 – Maximum electrode clearance for proof tests .21
Table 5 – Test voltages.24
Table A.1 – Designation maximum use voltage .31
Table D.1 – List and chronological order of type tests.35
Table E.1 – Characteristics of oil no. 1.38
Table F.1 – Classification of defects and associated requirements and tests .39
– 4 – 61112 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIVE WORKING –
ELECTRICAL INSULATING BLANKETS
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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 61112 has been prepared by IEC technical committee 78: Live
working.
This second edition cancels and replaces the first edition, published in 1992, and its
Amendment 1 (2002). This edition constitutes a technical revision.
It includes the following significant technical changes from the previous edition:
– general review of the requirements and test provisions;
– limitation of the scope in terms of the minimum width of electrical insulating blankets in
rolls;
– introduction of a definition of electrical insulating blankets including sheeting in various
shapes and in rolls;
– introduction of Class 00;
– withdrawal of category S and introduction of category R;
– clarification of the way electrical insulating blankets in rolls are covered by the test
procedures;
61112 © IEC:2009 – 5 –
– specification of standard and alternative types of electrodes for the proof test;
– modification of the test procedures for low and extremely low temperature by replacing the
dielectric proof test by a withstand test in the sanction;
– modification of the test procedures for acid and oil resistance by specifying the use of test
pieces and by replacing the dielectric proof test by a withstand test in the sanction;
– specification of liquid 102 for the oil resistance test and harmonisation of the mechanical
test sanction with the acid resistance test;
– preparation of the elements of evaluation of defects, and general application of IEC 61318
Ed.3;
– revision of existing annexes;
– deletion of Annexes D and F, not applicable according to IEC 61318 Ed.3;
– introduction of a new normative Annex F on classification of defects.
The text of this standard is based on the following documents:
FDIS Report on voting
78/785/FDIS 78/799/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.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
– 6 – 61112 © IEC:2009
INTRODUCTION
This International Standard has been prepared according to the requirements of IEC 61477
where applicable.
The product covered by this standard may have an impact on the environment during some or
all stages of its life cycle. These impacts can range from slight to significant, be of short-term
or long-term, and occur at the global, regional or local level.
Except for a disposal statement in the instructions for use, this standard does not include
requirements and test provisions for the manufacturers of the product, or recommendations to
the users of the product for environmental improvement. However, all parties intervening in its
design, manufacture, packaging, distribution, use, maintenance, repair, reuse, recovery and
disposal are invited to take account of environmental considerations.
61112 © IEC:2009 – 7 –
LIVE WORKING –
ELECTRICAL INSULATING BLANKETS
1 Scope
This International Standard is applicable to electrical insulating blankets for the protection of
workers from accidental contact with live or earthed electrical conductors, apparatus or
circuits and avoidance of short circuits on electrical installations.
Electrical insulating blankets in rolls having a width lower than 50 mm are not covered by this
standard.
NOTE 1 For a.c. electrical classification, as well as d.c. use, see 4.2.
NOTE 2 This standard gives a.c. test provisions. There is limited history for use in d.c. applications.
NOTE 3 See Annex A for suggested maximum voltage use.
2 Normative references
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.
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60060-2, High-voltage test techniques – Part 2: Measuring systems
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60212:1971, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60417, Graphical symbols for use on equipment
IEC 61318, Live working – Conformity assessment applicable to tools, devices and
equipment
IEC 61477, Live working – Minimum requirements for the utilization of tools, devices and
equipment
ISO 2592, Determination of flash and fire points – Cleveland open cup method
ISO 2977, Petroleum products and hydrocarbon solvents – Determination of aniline point and
mixed aniline point
ISO 3104, Petroleum products – Transparent and opaque liquids – Determination of kinematic
viscosity and calculation of dynamic viscosity
ASTM D 3767:2003 (reapproved 2008): Standard practice for rubber – Measurement of
dimensions
– 8 – 61112 © IEC:2009
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61318 and the
following apply.
3.1
disruptive discharge
passage of an arc following dielectric breakdown
NOTE 1 The term “sparkover” (in French “amorçage”) is used when a disruptive discharge occurs in a gaseous or
liquid dielectric.
NOTE 2 The term “flashover” (in French “contournement”) is used when a disruptive discharge occurs at least
partly along the surface of a solid dielectric surrounded by a gaseous or liquid medium.
NOTE 3 The term “puncture” (in French “perforation”) is used when a disruptive discharge occurs through a solid
dielectric producing permanent damage.
[IEV 651-01-18 and definition 2.7.7 of IEC 60743, modified]
3.2
elastomer
macromolecular material which returns rapidly to its initial dimensions and shape after
substantial deformation by a weak stress and release of the stress
NOTE 1 The definition applies under room temperature test conditions.
NOTE 2 Elastomer is a generic term that includes rubber, latex and elastomeric compounds that may be natural
or synthetic or a mixture or a combination of both. It also includes thermoplastic elastomer (TPE) material.
[ISO 472 modified]
3.3
electrical insulating blanket
flexible sheeting made of elastomer or plastic material, used to cover conductors or metallic
parts which are either energized, dead or earthed
NOTE The sheeting is either of various definite shapes or in roll allowing the workers to custom-cut the material
to fit the application.
[Definition 5.2.2 of IEC 60743 and IEV 651-04-06, modified]
3.4
nominal voltage (of a system)
suitable approximate value of voltage used to designate or identify a system
[IEV 601-01-21]
3.5
plastic
material which contains as an essential ingredient a high polymer and which at some stage in
its processing into finished products can be shaped by flow
NOTE 1 Elastomeric materials, which also are shaped by flow, are not considered as plastics.
NOTE 2 In some countries, particularly in the United Kingdom, it is a permitted option to use the term “plastics” as
the singular form as well as the plural form.
[Definition 2.4.4 of IEC 60743 and ISO 472]
3.6
proof test voltage
specified voltage that is applied to a device or test piece for the time defined under specified
conditions to assure that the electrical strength of the insulation is above a specified value
61112 © IEC:2009 – 9 –
3.7
withstand test voltage
voltage that a test piece is required to withstand without disruptive discharge or other electric
failure when voltage is applied under specified conditions
4 Requirements
4.1 General
Electrical insulating blanket shall be designed and manufactured to contribute to the safety of
the users provided they are used by skilled persons, in accordance with safe methods of work
and the instructions for use.
4.2 Classification
The electrical insulating blankets covered by this standard shall be designated as follows:
− by electrical class, as class 00, class 0, class 1, class 2, class 3 and class 4;
− by adding suffix(s) to the class designation, in the case of a blanket with special
category(s) as shown in Table 1.
Guidance for the selection of class (a.c. and d.c.) is given in Annex A.
Guidance as to the temperature range at which electrical insulating blankets can be used is
given in Annex B.
Table 1 – Special properties
Category Resistant to
A Acid
H Oil
Z Ozone
M Mechanical puncture
R Acid, Oil and Ozone
C Extremely low temperature
NOTE Any combination of categories may be used.
4.3 Physical requirements
4.3.1 Composition
Electrical insulating blankets shall be manufactured of elastomer or plastic materials and
produced by a seamless process. Where eyelets are provided in electrical insulating blankets
they shall be non-conductive. Where other types of fastening systems are provided in
electrical insulating blankets (for example hook and loop fastening) they shall also be non-
conductive.
NOTE A standard number, size and type of eyelets is usually proposed by the manufacturers. Eyelets of ∅8 mm
are the most common. For special needs, agreement could be reached between manufacturer and customer.
4.3.2 Shape and design
There is no requirement for the shape and design of the electrical insulating blankets.
Electrical insulating blankets may be either of various shapes or in rolls to be cut for individual
applications.
– 10 – 61112 © IEC:2009
The electrical insulating blankets of various shapes may be plain or of the slotted design
(Figure 1 and Figure 2 provide examples of such design). They may include a grid of synthetic
fiber for their reinforcement. In all cases electrical insulating blankets may have a strap(s)
®1)
(Velcro ) around their perimeter.
W
W
IEC 456/09
Key
L Length
W Width
Figure 1 – Example of plain design
W W
IEC 457/09
Key
L Length
W Width
Figure 2 – Example of slotted design
———————
1)
Velcro® is the trade name of a product supplied by Velcro Industries B.V. This information is given for the
convenience of users of this document and does not constitute an endorsement by IEC of the product named.
Equivalent products may be used if they can be shown to lead to the same results.
L
L
61112 © IEC:2009 – 11 –
4.3.3 Dimensions and tolerances
4.3.3.1 Length and width
Manufacturers shall provide blanket length and width. These dimensions for each blanket
shall be within a tolerance of ± 2 % of the stated dimensions.
Common lengths and widths for electrical insulating blankets are indicated in Table 2.
Table 2 – Common lengths and widths for electrical insulating blankets
Blankets of various shapes Blankets in rolls
Plain design Slotted design
Length Width Length Width Width
mm mm mm mm mm
a a
560 560 560 560 60 , 90
660 360 360, 500, 800,
900 500 900 900 1 000, 1 300, 2 000
910 305 - -
910 457
910 690
910 910 910 910
1 160 1 160 1 160 1 160
1 200 800
2 000 1 300 2 000 1 300
2 128
2 280 910
a
To be produced in class 00 and class 0 only.
NOTE Blankets with dimensions of 90 mm or less require special considerations for electrical testing.
4.3.3.2 Thickness
4.3.3.2.1 Maximum thickness
The maximum thickness of an electrical insulating blanket shall be as given in Table 3 in
order to obtain appropriate flexibility.
Blankets of categories A, H, M, R and Z may require additional thickness which shall not
exceed 0,6 mm.
Table 3 – Maximum thickness for electrical insulating blankets
Class Elastomer Plastic
mm mm
00 1,5 0,8
0 2,2 1,0
1 3,6 1,5
2 3,8 2,0
a
3 4,0
a
4 4,3
a
Unavailable on the market
4.3.3.2.2 Minimum thickness
The minimum thickness shall be determined only by the ability to pass the tests defined in
Clauses 5 and 6.
4.3.4 Workmanship and finish
Electrical insulating blankets shall be free from harmful physical irregularities on both
surfaces that can be detected by thorough test and/or inspection.
– 12 – 61112 © IEC:2009
Harmful physical irregularities defined as any feature that disrupts the uniform, smooth
surface contour, such as pinholes, cracks, blisters, cuts, conductive embedded foreign matter,
creases, pinch marks, voids (entrapped air), prominent ripples and prominent mould marks
shall not be acceptable.
Non-harmful physical irregularities defined as surface irregularities present on either surface
of the blanket due to imperfections on forms or moulds or other imperfections inherent to the
manufacturing process shall be acceptable. These irregularities appear as mould marks that
look like cuts even though they are actually a raised ridge of elastomer, indentations, or
protuberances.
4.4 Mechanical, climatic and environmental requirements
Electrical insulating blankets shall support the mechanical, climatic and environmental
stresses occurring during normal working conditions.
Electrical insulating blankets with one or more special categories shall support any relevant
additional stresses.
4.5 Dielectric requirements
Electrical insulating blankets shall be capable of withstanding the corresponding electrical
stresses according to their electrical class.
4.6 Marking
Electrical insulating blankets complying with the requirements of this standard shall be
marked on the product with the following items of marking:
– name, trademark or identification of the manufacturer;
– symbol IEC 60417-5216 (2002-10) – Suitable for live working; double triangle
(see Annex C);
NOTE 1 The exact ratio of the height of the figure to the base of the triangle is 1,43. For the purpose of
convenience, this ratio can be between the values of 1,4 and 1,5.
– number of the relevant IEC standard immediately adjacent to the symbol, (IEC 61112);
– month and year of manufacture;
– category if applicable;
– class designation.
For blankets in rolls, these items of marking shall appear at least every metre.
NOTE 2 Manufacturers are recommended to mark blankets in rolls of Class 00 and Class 0 at least every 30 cm
to retain marking information in case it is later cut into smaller parts.
NOTE 3 Blankets in rolls of Class 00 and Class 0 may be considered as consumable products, intended for a
single use.
Any additional item of marking shall be subject to agreement between the manufacturer and
the customer.
The marking shall be clearly visible, durable and shall not impair the quality of the electrical
insulating blanket.
When a colour code is used, the colour of the symbol (double triangle) shall correspond to the
following code:
– Class 00 - beige;
– Class 0 - red;
61112 © IEC:2009 – 13 –
– Class 1 - white;
– Class 2 - yellow;
– Class 3 - green;
– Class 4 - orange.
4.7 Packaging
Electrical insulating blankets shall be packaged in containers or packages of sufficient
strength to properly protect the electrical insulating blankets from damage during delivery and
normal storage and transportation before first use.
NOTE It is the responsibility of the user to provide protective packaging (ex: a specific bag) if cut portions are to
be reused.
The outside of the container or package shall be marked with at least the following
information:
– number of the relevant IEC standard immediately adjacent to the symbol with year of
publication (4 digits), (IEC 61112:2009);
– name, trademark, or identification of the manufacturer.
4.8 Instructions for use
The manufacturer shall provide written instructions for use with each packaging of electrical
insulating blankets covered by this standard.
These instructions shall be prepared in accordance with the general provisions of IEC 61477.
The instructions for use shall include, as a minimum, information such as storage, handling,
disposal and periodic testing.
The instructions for use shall inform the users about critical hazards the manufacturer is
aware of and offer relevant recommendations, but without intruding into the area of work
procedures (for example, recommendation in case of overlapping blankets).
5 Tests
5.1 General
The present standard provides testing provisions to demonstrate compliance of the product to
the requirements of Clause 4. These testing provisions are primarily intended to be used as
type tests for validation of the design input. Where relevant, alternative means (calculation,
examination, tests, etc.) are specified within the test subclauses for the purpose of electrical
insulating blankets having completed the production phase.
The allocation of the electrical insulating blankets into various test groups, the quantity
required and the order in which the type tests are carried out are given in Annex D.
The test location conditions shall be in accordance with IEC 60068-1:
– ambient temperature: 15 °C to 35 °C;
– relative humidity: 45 % to 75 %;
– atmospheric pressure: 86 kPa to 106 kPa.
For type tests, unless otherwise specified, electrical insulating blankets or test pieces shall be
conditioned for a period of 2 h ± 0,5 h at a temperature of 23 °C ± 2 °C and relative humidity
of 50 % ± 5 % according to IEC 60212 standard atmosphere B.
– 14 – 61112 © IEC:2009
Unless otherwise specified, the tolerances for any measured value shall be ± 5 %.
5.2 Visual inspection and measurements
5.2.1 General
Visual inspection shall be carried out by a person with normal or corrected vision without
additional magnification.
5.2.2 Classification
It shall be checked by visual inspection that the requirements of 4.2 are fulfilled.
5.2.3 Composition
It shall be checked by visual inspection that the requirements of 4.3.1 are fulfilled.
5.2.4 Dimensions, workmanship and finish
The product length and width as provided by the manufacturer shall be verified with electrical
insulating blankets in a flattened condition. The dimensional requirements shall be considered
as fulfilled if the dimensioning is within the tolerances outlined in 4.3.3.1.
The workmanship and finish shall be verified by visual inspection. In case of a roll, a length of
2 m shall be submitted to inspection.
The inspection shall be considered as passed if the requirements of 4.3.4 are satisfied. Non-
harmful physical irregularities are defined as surface irregularities present on either surface of
the blanket due to imperfections on forms or moulds or other imperfections inherent to the
manufacturing process and are acceptable provided that:
a) the depression has rounded edges and no visible break in the surface, and cannot be
seen on the opposite side when stretching over the thumb;
b) there are not more than five depressions as described in a) anywhere on the electrical
insulating blanket or on the roll section under test and any two are separated by at least
15 mm;
c) the indentations, protuberances or mould marks tend to blend into a smooth surface upon
stretching of the material;
d) the small projections or protuberances represent only a small amount of excess material
that cannot be readily removed with the finger and these projections do not appreciably
affect the stretching of the material.
5.2.5 Thickness
Thickness measurements shall be made at five or more points uniformly distributed over the
total area of the electrical insulating blanket. In case of a roll, a length of 2 m shall be
submitted to test.
Measurements shall be made with a commercial device designed for use on flexible materials
and that measures the maximum thickness with an accuracy of 0,03 mm. Sufficient support
shall be given to the blanket so that it will present an unstressed flat surface at the
measurement point.
According to ASTM D3767, the pressure exerted by the presser foot of the measuring device
shall be (22 ± 5) kPa for blanket material having a hardness equal to or greater than 35 IRHD,
and (10 ± 2) kPa for blanket material having a hardness less than 35 IRHD.
The test shall be considered as passed if the requirements of 4.3.3.2.1 are fulfilled.
61112 © IEC:2009 – 15 –
5.3 Marking
5.3.1 Visual inspection and measurement
The marking requirements of 4.6 shall be verified by visual inspection. In case of a roll, a
length of 2 m shall be submitted to test.
5.3.2 Durability of marking
The durability of the items marked on the electrical insulating blanket shall be checked by
rubbing vigorously for 15 s with a piece of lint-free cloth soaked in soapy water and then
rubbing it for a further 15 s with a piece of lint-free cloth soaked in isopropanol (CH -CH(OH)-
CH ).
NOTE It is the employer’s duty to ensure that any relevant legislation and any specific safety instructions
regarding the use of this chemical are fully observed.
The test shall be considered as passed if the items of marking remain legible and the letters
do not smear.
For marking produced by an engraving or moulding process, the test for durability is not
needed.
5.4 Packaging and instructions for use
The packaging and complete supply of the information required in 4.7 and 4.8 shall be verified
by visual inspection.
5.5 Mechanical tests
5.5.1 General
All mechanical tests shall be performed on test pieces which have been conditioned by
storing each separately in a flat, horizontal position for at least 24 h at a temperature of
23 °C ± 2 °C and relative humidity of 50 % ± 5 % according to IEC 60212, standard
atmosphere B. In the case of blankets in rolls, the material taken from the roll needed to
prepare the test pieces shall be cut before conditioning.
NOTE The properties of vulcanized elastomeric material change continuously with time, these changes being
particularly rapid in the period immediately following vulcanization.
5.5.2 Tensile strength and elongation at break
Dumb-bell test pieces shall have the outline shown in Figure 3 and four shall be cut from the
corners of the electrical insulating blanket under test, one near each corner. Two test pieces
shall be cut in length and two in width. The dumb-bell test pieces shall be cut longitudinally for
roll material with width less than 75 mm.
Reference lines, 20 mm apart, shall be
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...