IEC 61111:2009
(Main)Live working - Electrical insulating matting
Live working - Electrical insulating matting
IEC 61111:2009 is applicable to electrical insulating matting made of elastomer for use as a floor covering for the electrical protection of workers 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 with regard to the previous edition:
- general review of the requirements and test provisions;
- modification of the test procedure for slip resistance;
- 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.
Travaux sous tension - Tapis isolants électriques
La CEI 61111:2009 est applicable aux tapis isolants électriques en élastomère utilisés pour couvrir le sol en vue de la protection électrique des travailleurs dans les installations électriques. Cette seconde 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 modification de la procédure d'essai de résistance au glissement;
- 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.
General Information
Relations
Standards Content (Sample)
IEC 61111 ®
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Live working – Electrical insulating matting
Travaux sous tension – Tapis isolants électriques
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IEC 61111 ®
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Live working – Electrical insulating matting
Travaux sous tension – Tapis isolants électriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 13.260; 29.260.99 ISBN 978-2-88910-413-0
– 2 – 61111 © 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.9
4.3.3 Dimensions and tolerances.9
4.3.4 Workmanship and finish .10
4.4 Mechanical, climatic and environmental requirements .10
4.5 Dielectric requirements.11
4.6 Marking .11
4.7 Packaging .11
4.8 Instructions for use.11
5 Tests .12
5.1 General .12
5.2 Visual inspection and measurements.12
5.2.1 General .12
5.2.2 Classification.12
5.2.3 Composition .12
5.2.4 Dimensions, workmanship and finish .12
5.2.5 Thickness .13
5.3 Marking .13
5.3.1 Visual inspection and measurement .13
5.3.2 Durability of marking.13
5.4 Packaging and instructions for use .13
5.5 Mechanical tests .14
5.5.1 General .14
5.5.2 Mechanical puncture resistance.14
5.5.3 Test for slip resistance .14
5.6 Dielectric tests .15
5.6.1 General .15
5.6.2 Electrodes .16
5.6.3 Test equipment.19
5.6.4 Electrical test procedure .19
5.7 Ageing tests .20
5.8 Thermal tests .21
5.8.1 Flame retardance test.21
5.8.2 Low temperature folding test (except for matting of category C).21
5.8.3 Extremely low temperature folding test for matting of category C only .22
5.9 Acid resistance.23
5.10 Oil resistance .23
61111 © IEC:2009 – 3 –
6 Conformity assessment of electrical insulating matting having completed the
production phase.23
7 Modifications .23
Annex A (informative) Guidelines for the selection of the class of electrical insulating
matting in relation to nominal voltage of a system .24
Annex B (informative) In-service care and testing .25
Annex C (normative) Suitable for live working; double triangle (IEC 60417–5216
(2002-10)).27
Annex D (normative) General type test procedure.28
Annex E (normative) Oil for tests for oil resistance.30
Annex F (normative) Classification of defects and tests to be allocated .31
Bibliography.32
Figure 1 – Test plates and needle for resistance to mechanical puncture.15
Figure 2 – Test set-up for voltage proof test of electrical insulating matting with
standard type of electrodes.16
Figure 3 – Test set-up for voltage proof test of electrical insulating matting with
alternative type of electrodes .18
Figure 4 – Test set-up for voltage withstand test.19
Figure 5 – Test set-up for low and extremely low temperature folding tests.22
Table 1 – Common lengths and widths for electrical insulating matting .10
Table 2 – Maximum thickness for electrical insulating matting.10
Table 3 – Maximum electrode clearance for proof tests .17
Table 4 – Test voltages.20
Table A.1 – Designation maximum use voltage .24
Table D.1 – List and chronological order of type tests.28
Table E.1 – Characteristics of oil no. 1.30
Table F.1 – Classification of defects and associated requirements and tests .31
– 4 – 61111 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIVE WORKING –
ELECTRICAL INSULATING MATTING
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
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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
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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 61111 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 with regard to the previous edition:
• general review of the requirements and test provisions;
• modification of the test procedure for slip resistance;
• specification of standard and alternative types of electrodes for the proof test;
• increase of the conditioning time for low temperature folding test to 4 hours;
• 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;
61111 © IEC:2009 – 5 –
• 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
78/784/FDIS 78/798/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 – 61111 © 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.
61111 © IEC:2009 – 7 –
LIVE WORKING –
ELECTRICAL INSULATING MATTING
1 Scope
This International Standard is applicable to electrical insulating matting made of elastomer for
use as a floor covering for the electrical protection of workers on electrical installations.
NOTE 1 For a.c. electrical classification, as well as d.c. use, see 4.2.
NOTE 2 This document 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
ISO 5904:1981, Gymnastic equipment – Landing mats and surfaces for floor exercises –
Determination of resistance to slipping
ASTM D 3767:2003 (reapproved 2008), Standard practice for rubber – Measurement of
dimensions
– 8 – 61111 © 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 matting
flexible sheeting made of elastomer, used to cover the surface on which the worker is
standing (the potential of this surface is usually that of earth)
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 5.2.3 of IEC 60743 and IEV 651-04-07, 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
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
3.6
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
61111 © IEC:2009 – 9 –
4 Requirements
4.1 General
Electrical insulating matting 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 matting covered by this standard shall be designated as follows:
– by electrical class: as class 0, class 1, class 2, class 3 and class 4;
– by adding the suffix “C” to the class designation, in case of category C matting
(resistance to extremely low temperature).
Guidance for the selection of class (a.c. and d.c.) is given in Annex A.
Guidance as to temperature range at which electrical insulating matting can be used is given
in Annex B.
4.3 Physical requirements
4.3.1 Composition
The electrical insulating matting shall be manufactured of elastomer.
Both sides of the electrical insulating matting shall be slip resistant. The slip resistance may
be achieved with surface such as corrugated or diamond design.
Any insert shall not affect adversely the dielectric characteristics of the electrical insulating
matting.
4.3.2 Shape
There is no requirement for the shape of the electrical insulating matting.
Electrical insulating matting may be either of various shapes or in rolls to be cut for individual
applications.
4.3.3 Dimensions and tolerances
4.3.3.1 Length and width
Electrical insulating matting shall not have length and width less than 600 mm.
Manufacturers shall provide matting length and width. These dimensions for each matting
shall be within a tolerance of ± 2 % of the stated dimensions.
Common lengths and widths for electrical insulating matting are indicated in Table 1.
– 10 – 61111 © IEC:2009
Table 1 – Common lengths and widths for electrical insulating matting
Matting in various shapes Matting in rolls
Length Width Width
mm mm mm
1 000 600 610
1 000 1 000 760
1 000 2 000 915
1 220
4.3.3.2 Thickness
4.3.3.2.1 Maximum thickness
The maximum thickness of matting shall be as given in Table 2 in order to obtain appropriate
flexibility.
Table 2 – Maximum thickness for electrical insulating matting
Class mm
0 6,0
1 6,0
2 8,0
3 11,0
4 14,0
When corrugations or diamonds are present, measurements shall be made over the
corrugations or diamonds. The corrugations shall not be more than 3 mm deep. The diamonds
shall not be higher than 2 mm.
4.3.3.2.2 Minimum thickness
The minimum thickness shall be determined only by the ability to pass the tests defined in
Clause 5.
4.3.4 Workmanship and finish
Electrical insulating matting shall be free from harmful physical irregularities on both surfaces
that can be detected by thorough test and/or inspection.
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 matting 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 matting shall support the mechanical, climatic and environmental stresses
occurring during normal working conditions.
All electrical insulating matting shall be resistant to acid, oil, and low temperature and
Category C shall be resistant to extremely low temperature.
61111 © IEC:2009 – 11 –
4.5 Dielectric requirements
Electrical insulating matting shall be capable of withstanding the corresponding electrical
stresses according to its electrical class.
4.6 Marking
Electrical insulating matting 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 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 61111);
• month and year of manufacture;
• category if applicable;
• class designation.
In the case of matting in rolls, these items of marking shall appear at least every metre.
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 matting.
When a colour code is used, the colour of the symbol (double triangle) shall correspond to the
following code:
Class 0 – red
Class 1 – white
Class 2 – yellow
Class 3 – green
Class 4 – orange
4.7 Packaging
Electrical insulating matting shall be packaged in containers or packages of sufficient strength
to properly protect the electrical insulating matting 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 61111:2009);
• 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 matting covered by this standard.
– 12 – 61111 © IEC:2009
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 matting).
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 matting having completed the production phase.
The allocation of the electrical insulating matting 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 matting 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.
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 matting in a flattened condition. The test shall be considered as passed if the
requirement for the minimum dimensioning is fulfilled and the tolerances are in accordance
with 4.3.3.1.
61111 © IEC:2009 – 13 –
The workmanship and finish shall be verified by visual inspection. In case of 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 matting due to imperfections on forms or moulds or other imperfections inherent to the
manufacturing process and are acceptable provided that:
a) the thickness at any irregularity conforms to the thickness requirements. Surface design to
improve slip resistance shall not be considered as irregularities;
b) the indentations, protuberances or mould marks tend to blend into a smooth slope upon
stretching of the material.
5.2.5 Thickness
Thickness measurements shall be made at five or more points approximately uniformly
distributed over the total area of the electrical insulating matting. 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 matting 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 matting material having a hardness equal to or greater than 35 IRHD,
and (10 ± 2) kPa for matting 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.
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 matting 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.
– 14 – 61111 © IEC:2009
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 matting 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 Mechanical puncture resistance
This test shall be carried out on both sides of the matting.
Two circular test pieces 50 mm in diameter shall be cut from the electrical insulating matting
and each shall be clamped between two flat 50 mm diameter test plates such that one test
piece is perforated from one side and the other test piece is perforated from the other side.
The top plate shall have a circular opening 6 mm in diameter and the bottom plate a 25 mm
diameter circular opening. The edges of both openings shall be rounded to a radius of 0,8 mm
(see Figure 1).
A needle shall be produced from a 5 mm diameter metallic rod and one end shall be machined
to produce a taper with an included angle of 12° and with the tip rounded to a radius of
0,8 mm (see Figure 1). The needle shall be clean at time of use.
The needle shall be positioned perpendicularly above the test piece (clamped between the
plates) and shall be driven into and through the specimen. The rate of traverse shall be
500 mm/min ± 50 mm/min. The force required to perform the puncture shall be measured.
The test shall be considered as passed if the puncture resistance is greater than 70 N.
5.5.3 Test for slip resistance
The test shall be performed according to ISO 5904 with the following provisions:
– the test shall be carried out on a test piece of insulating electrical matting of
600 mm × 600 mm;
– the test shall be carried out along both directions on each side of the test piece;
– before testing, both surfaces of the test piece shall be cleaned with isopropanol and
allowed to dry completely before continuing the test.
The cylindrical friction piece specified in ISO 5904 shall be replaced by a test cube specified
as follows:
– bearing-surface area after rounding the edges: 100 mm × 100 mm ± 0,5 mm;
– material of the bearing-surface area: stainless steel for general use (such as martensitic),
with a minimum chromium (Cr) content of 12% (to avoid oxidation);
– surface texture of the bearing-surface area: roughness average Ra = 0,8 µm;
– roundness of the edges at right angles to tensile direction: r = 2 mm;
– weight of the total test cube: 5 kg ± 5 g.
The test shall be considered as passed if the average tensile force F for each side and
direction of the test piece is higher than 50 N.
61111 © IEC:2009 – 15 –
Dimensions in millimetres except for angles
∅6
R = 0,8
∅50
R = 0,8
∅25
∅50
12°
R = 0,8
IEC 451/09
Key
1 Top plate
2 Bottom plate
3 Needle
Figure 1 – Test plates and needle for resistance to mechanical puncture
5.6 Dielectric tests
5.6.1 General
Dielectric testing shall be carried out using a. c. voltage. The peak (crest) or r.m.s. value of
the a.c. voltage shall be measured with a maximum error according to IEC 60060-2.
The matting, including test pieces from rolls, shall be conditioned for moisture absorption by
total immersion in a bath of tap water with a resistivity of (100 ± 15) Ω·m at room temperature
∅5
– 16 – 61111 © IEC:2009
(as specified in 5.1) for a period of 16 h ± 0,5 h. After the conditioning they shall be wiped dry
and immediately submitted to the dielectric test.
NOTE Insulating compounds used in the finishing process (e.g. paraffin and talcum powder) should be removed
with suitable solvents before the test is commenced.
5.6.2 Electrodes
5.6.2.1 General
Electrodes shall be of such design so as to apply the electrical stress uniformly over the test
area without producing corona at any point or mechanical strain in the material.
The different types of electrodes to be employed are described as follows.
5.6.2.2 For voltage proof test
5.6.2.2.1 Standard type of electrodes
Unless flashover happens during the conduct of the test, this type of electrodes shall be used
for all classes of matting.
The test electrodes shall be conductive plates, having smoothly rounded edges and corners,
of a size that covers the maximum area of the electrical insulating matting or test piece, taking
into account the maximum clearance given in Table 3 (see Figure 2).
IEC 452/09
Key
1 Conductive plate
2 Matting or test piece
3 Electrode clearance
Figure 2 – Test set-up for voltage proof test of electrical insulating matting
with standard type of electrodes
61111 © IEC:2009 – 17 –
Table 3 – Maximum electrode clearance for proof tests
Class of electrical Clearance for tests
insulating matting mm
0 80
1 80
2 150
3 200
4 300
In case of tests on rolls, the electrodes shall be able to contain at least a length of electrical
insulating matting equal to its width.
The electrodes shall be of such dimensions that the clearances specified in Table 3 are not
exceeded.
Clearance is defined as the distance between the upper electrode and the lower electrode
around the edge of the matting or test piece.
5.6.2.2.2 Alternative type of electrodes in case of flashover with the standard type
If flashover happens during the conduct of the test with the standard type of electrodes of
5.6.2.2.1, the following type of electrodes shall be used.
A 1 270 mm × 1 270 mm sheet of insulating material 3 mm to 5 mm thick, which has a
762 mm × 762 mm opening in the centre, shall be placed on an earthed metal plate.
This mask, which has a "picture frame" appearance, shall have the opening filled with a
conductive material of such thickness as to bring the earth electrode to approximately the
same level as the mask in order to maintain direct contact with the matting or test piece.
The matting or test piece shall be placed over the mask.
A rectangular metal plate, 762 mm × 762 mm and approximately 5 mm thick, having smoothly
rounded edges and corners, shall be placed on top of the matting or test piece. This top plate
shall then be energized with the test voltage (see Figure 3).
NOTE 1 This arrangement will test a 762 mm × 762 mm area of a 914 mm × 914 mm matting at 40 kV a.c. as the
mask prevents flashover.
NOTE 2 Other mask dimensions may be used according to the dimensions of the matting.
Other electrode designs may be used to achieve the same results.
– 18 – 61111 © IEC:2009
Dimensions in millimetres
1 270
IEC 453/09
Key
1 Hole 4 Conductive material
2 Plexiglass mask (thickness 3 mm to 5 mm) 5
Matting or test piece (1 000 mm × 1 000 mm)
3 Metal plate
Figure 3 – Test set-up for voltage proof test of electrical insulating matting
with alternative type of electrodes
5.6.2.3 For voltage withstand test
The electrodes shall consist of two metal cylinders with the sharp edges removed to give a
radius of 3 mm. One electrode shall be 25 mm in diameter and approximately 25 mm long.
The other electrode shall be 75 mm in diameter and approximately 15 mm long. These
electrodes shall be arranged coaxially as in Figure 4.
1 270
61111 © IEC:2009 – 19 –
Dimensions in millimetres
∅25
R = 3
∅75
IEC 454/09
Key
1 Test piece 4 Metal base
2 Tank 5 Metal
3 Insulating liquid
Figure 4 – Test set-up for voltage withstand test
5.6.3 Test equipment
The test equipment used shall be capable of supplying an essentially stepless and
continuously variable test voltage. Motor-driven regulating equipment is convenient and tends
to provide uniform rate-of-rise to the test voltage. The test equipment shall be protected by an
automatic circuit-breaking device designed to open promptly on the current produced by
failure of the matting or test piece.
5.6.4 Electrical test procedure
5.6.4.1 Test equipment
The test voltage shall be applied according to IEC 60060-1 and the measuring equipment
shall comply with IEC 60060-2.
5.6.4.2 Proof test procedure
5.6.4.2.1 Type test
Electrical insulating matting in plane form shall be tested as received, without modification. In
the case of electrical insulating matting in rolls, having a width equal to or larger than
1 000 mm, the minimum size of ea
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