SIST IEC 60839-2-7:1995

Alarm systems - Part 2: Requirements for intruder alarm systems - Section 7: Passive glass-break detectors for use in buildings

Gives the specific requirements and test methods for passive glass-break detectors using piezoelectric sensors for use in intruder alarm systems installed in buildings.

Systèmes d'alarme - Partie 2: Prescriptions pour les systèmes d'alarme anti-intrusion - Section 7: Détecteurs passifs de bris de glace dans les bâtiments

Décrit les prescriptions spécifiques et les méthodes d'essai pour les détecteurs passifs de bris de glace piézoélectriques utilisés dans les systèmes d'alarme anti-intrusion dans les bâtiments.

Alarm systems - Part 2: Requirements for intruder alarm systems - Section 7: Passive glass break detectors for use in buildings

General Information

• Status: Published
• Publication Date: 31-Aug-1995
• ICS: 13.320 - Alarm and warning systems
• Technical Committee: EAL - Alarm systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-1995
• Due Date: 01-Sep-1995
• Completion Date: 01-Sep-1995
• Ref Project: IEC 60811-505:2012 - Electric and optical fibre cables - Test methods for non-metallic materials - Part 505: Mechanical tests - Elongation at low temperature for insulations and sheaths

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Alarm systems - Part 2: Requirements for intruder alarm systems - Section 7: Passive glass break detectors for use in buildingsSystèmes d'alarme - Partie 2: Prescriptions pour les systèmes d'alarme anti-intrusion - Section 7: Détecteurs passifs de bris de glace dans les bâtimentsAlarm systems - Part 2: Requirements for intruder alarm systems - Section 7: Passive glass-break detectors for use in buildings13.320Alarmni in opozorilni sistemiAlarm and warning systemsICS:Ta slovenski standard je istoveten z:IEC 60839-2-7SIST IEC 60839-2-7:1995en01-september-1995SIST IEC 60839-2-7:1995SLOVENSKI
STANDARD



SIST IEC 60839-2-7:1995



NORMECEIINTERNATIONALEIECINTERNATIONAL60839-2-7STANDARDPremière éditionFirst edition1994-12Systèmes d'alarmePartie 2:Prescriptions pour les systèmes d'alarmeanti-intrusionSection 7 – Détecteurs passifs de bris de glacedans les bâtimentsAlarm systemsPart 2:Requirements for intruder alarm systemsSection 7 – Passive glass-break detectorsfor use in buildings© IEC 1994 Droits de reproduction réservés — Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niNo part of this publication may be reproduced or utilized inutilisée sous quelque forme que ce soit et par aucunany form or by any means, electronic or mechanical,procédé, électronique ou mécanique, y compris la photo-including photocopying and microfilm, without permission incopie et les microfilms, sans l'accord écrit de l'éditeur.writing from the publisher.International Electrotechnical Commission3, rue de Varembé Geneva, SwitzerlandTelefax: [phone]e-mail: [e-mail] web site http: //www.iec.chIEC•Commission Electrotechnique InternationaleInternational Electrotechnical CommissionMekfayHapoaHaa 3nenrporexHH4ecnaa HOMHCCHfl•CODE PRIXPRICE CODEPour prix, voir catalogue en vigueurFor price, see current catalogueSIST IEC 60839-2-7:1995



839-2-7 © IEC:1994— 3 —CONTENTSPageFOREWORD 5Clause1 Scope 72Normative references 73Definitions94General considerations95 Requirements 95.1Functional95.2Environmental 115.3 Safety
135.4Reliability 135.5Interface
135.6 Construction 135.7 Marking 135.8Manufacturer's specifications 135.9 Enhancements 135.10 Installation test equipment 156 Test methods
156.1Sensitivity, reproducibility and sorting 156.2 Test matrix
156.3Group 1 tests
176.4 Group 2 tests
216.5 Group 3 tests
256.6Installation test equipment 29Figures
31SIST IEC 60839-2-7:1995



839-2-7 © IEC:1994— 5 —INTERNATIONAL ELECTROTECHNICAL COMMISSIONALARM SYSTEMS –Part 2: Requirements for intruder alarm systems –Section 7: Passive glass-break detectors for use in buildingsFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardizationcomprising all national electrotechnical committees (IEC National Committees). The object of the IEC is topromote international cooperation on all questions concerning standardization in the electrical andelectronic fields. To this end and in addition to other activities, the IEC publishes International Standards.Their preparation is entrusted to technical committees; any IEC National Committee interested inthe subject dealt with may participate in this preparatory work. International, governmental andnon-governmental organizations liaising with the IEC also participate in this preparation. The IECcollaborates closely with the International Organization for Standardization (ISO) in accordance withconditions determined by agreement between the two organizations.2)The formal decisions or agreements of the IEC on technical matters, prepared by technical committees onwhich all the National Committees having a special interest therein are represented, express, as nearly aspossible, an international consensus of opinion on the subjects dealt with.3)They have the form of recommendations for international use published in the form of standards, technicalreports or guides and they are accepted by the National Committees in that sense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.International Standard IEC 839-2-7 has been prepared by IEC technical committee 79:Alarm systems.The text of this standard is based on the following documents:DISReport on voting
79(CO)5279/136/RVDFull information on the voting for the approval of this standard can be found in the reporton voting indicated in the above table.SIST IEC 60839-2-7:1995



839-2-7 © IEC:1994–7-ALARM SYSTEMS -Part 2: Requirements for intruder alarm systems -Section 7: Passive glass-break detectors for use in buildings1 ScopeThis section of IEC 839-2 gives the specific requirements and test methods for passiveglass-break detectors using piezoelectric sensors for use in intruder alarm systemsinstalled in buildings.This standard is an addition to the general requirements for detectors for use in intruderalarm systems as specified in IEC 839-2-2, and should also be used in conjunction withthe standard for general requirements for alarm systems, IEC 839-1-1.This standard applies to detectors designed to detect the breaking of glazed areas ofstandard glass or plate glass on which the sensor is mounted.NOTES1The detectors may not be suitable for use on toughened glass, laminated glass, plastic-coated glass orwired glass.2Other glass-break detectors will be covered in other standards.2 Normative referencesThe following normative documents contain provisions which, through reference in thistext, constitute provisions of this section of IEC 839-2. At the time of publication, theeditions indicated were valid. All normative documents are subject to revision, and partiesto agreements based on this section of IEC 839-2 are encouraged to investigate thepossibility of applying the most recent editions of the normative documents indicatedbelow. Members of IEC and ISO maintain registers of currently valid InternationalStandards.IEC 68-1: 1988, Environmental testing – Part 1: General and guidanceIEC 68-2-62: 1991, Environmental testing – Part 2: Tests – Test Ef: Impact, pendulumhammerIEC 801-3: 1984, Electromagnetic compatibility for industrial-process measurement andcontrol equipment – Part 3: Radiated electromagnetic field requirementsIEC 839-1-1: 1988, Alarm systems – Part 1: General requirements – Section One: GeneralIEC 839-1-3: 1988, Alarm systems – Part 1: General requirements – Section Three:Environmental testing for alarm systemsIEC 839-2-2: 1987, Alarm systems – Part 2: Requirements for intruder alarm systems –Section Two: Requirements for detectors – GeneralSIST IEC 60839-2-7:1995



839-2-7 © I EC:1994_ g —3 DefinitionsFor the purpose of this section of IEC 839-2 the following definitions apply in addition tothose given in IEC 839-1-1 and IEC 839-2-2.3.1 break: The result of an impact on a sheet of glass which causes fragmentation ofthe glass and which leaves an aperture in the glass.3.2 passive glass-break detector: A detector whose sensor is mounted on the surfaceof a sheet of glass and which responds to the shock waves transmitted through the glasswhen it is broken.NOTE - For a passive glass-break detector using a piezoelectric sensor, the sensor is bonded to thesurface of the glass by means of an adhesive.3.3 detection coverage: The area of a sheet of glass within which a break will bereliably detected.3.4 detection range: The distance in a given direction from the sensor to the boundaryof the detection coverage.4 General considerationsThe detector shall consist of one or more sensors and a processor. Where the processoris contained in the same housing as the sensor, for the purposes of this standard thedetector will be referred to as a sensor. Where the processor is separated from the sensorit shall meet the requirements of IEC 839-2-2.The sensitivity of the detector is limited in order to avoid false alarms from normalimpacts, but the detector may still be susceptible to deliberate attempts to cause falseoperation. The limitation of sensitivity means that this type of detector is unsuitable for thedetection of forms of attacks on the glass other than by breaking, such as by the use of aglass cutter.Because of the uncertain and variable nature of the breaking of glass, it is not possible tospecify precise limits for the performance of passive glass-break detectors and therefore astatistical test method has been specified for the verification of the detection range.The variable nature of the signals from breaking glass is such that this test should only beconsidered to be a gross test of performance.5 Requirements5.1 Functional5.1.1 Signal processingThe detector shall generate an alarm condition as a result of a break in the glass withinthe area of detection coverage when assessed in accordance with the test methods asgiven in 6.3.1 and 6.3.2.SIST IEC 60839-2-7:1995



839-2-7 ©IEC:1994— 11 —The reproducibility of detectors shall be such that the range of sensitivity does notexceed 2:1.The detector shall not generate an alarm condition when subjected to the followinginfluences without the glass being broken:-impact on the detector;—soft impact against the glass;hard impact against the glass;—throwing of gravel against the glass.5.1.2 Sensitivity adjustmentNo additional requirements.5.1.3 Supply voltageThe detector shall meet the requirements of this standard within a supply voltage rangeof ±25 %.5.1.4 Tamper detectionTamper detection shall be fitted to any housing which is designed to be opened.5.1.5 Protection against tamperThe application of magnetic fields to the outside of the glass shall not generate an alarmcondition other than a tamper alarm and shall not prevent the detector from operatingwithin specification.5.1.6 Cable protectionWhere a sensor is in a separate housing from its processor the connecting cable betweenthe sensor and the processor shall be considered to be part of the detector. It shall beelectrically monitored in such a way that if the disconnection of any conductor or shortcircuit of all conductors prevents alarm information or a tamper alarm being received bythe processor, the processor itself shall generate an alarm condition within 10 s.5.2 EnvironmentalThe sensor shall meet its operational requirements after being subjected to the environ-mental tests specified in 7.2 of IEC 839-2-2 with the following modifications:-dry heat: temperature of 70 °C for 16 h;-cold:temperature of —10 °C for 16 h.The sensor shall not generate a false alarm when it is subjected to temperatures be-tween —10 °C and —25 °C.NOTE — It is not required that the detector meets its specified performance within this temperature range.The sensor, mounted on glass in accordance with the manufacturer's instructions, shallmeet its operational requirements after being subjected to temperature cyclingbetween —10 °C and +40 °C in high humidity.SIST IEC 60839-2-7:1995



839-2-7 © I EC:1994- 13 -5.3 SafetyNo additional requirements.5.4 ReliabilityNo additional requirements.5.5 InterfaceNo additional requirements.5.6 ConstructionThe sensor construction shall be of rugged design such that the sensor will survive a freefall from a height of 2 000 mm on to a concrete floor.An adhesive shall be specified by the manufacturer which is suitable for bonding thesensor to the glass with sufficient strength to maintain the bond when the sensor issubjected to impacts, thermal stress, window-cleaning solvents, salt water andUV-radiation.The manufacturer shall supply evidence that both the adhesive and the material of thesensor housing are suitable for an operational lifetime in excess of 60 000 h.If the adhesive requires a UV shield on the outside of the glass, this shield shall be usedduring the tests and shall be applied according to the manufacturer's instructions.The design of the sensor housing shall be such that no moisture traps shall exist betweenthe sensor housing and the glass surface when the sensor is bonded to the glass inaccordance with the manufacturer's instructions.5.7 MarkingNo additional requirements.5.8 Manufacturer's specificationsIn addition to the information required in 6.8 of IEC 839-2-2, the manufacturer shallprovide the following information:a list of those types of glass for which the detector is suitable;- the detection coverage for each type of glass listed.5.9 EnhancementsThe detector shall provide a latched indication of an alarm condition for each sensor.When the indication is given at the sensor, it shall not be visible from the opposite side ofthe glass to that on which the sensor is bonded.SIST IEC 60839-2-7:1995



839-2-7 © IEC:1994- 15 -5.10 Installation test equipmentEquipment shall be provided which will permit a test of an installed detector by applying astimulus to the surface of the glass at a specified range from the sensor. When the test iscarried out in accordance with the manufacturer's instructions it shall generate an alarmcondition.6 Test methodsA minimum of 10 detectors or 10 sensors with the appropriate number of processors shallbe submitted for the tests.6.1 Sensitivity, reproducibility and sortingTen samples shall be tested using the arrangement shown in figure 1.The sensor shall be sonically coupled to the glass surface using a suitable coupling liquid,such as a 35 % solution of monoethylene glycol in water, which shall remain consistentthroughout the period of the tests.Each sensor shall be connected to a processor and the detector shall be in the operatingcondition during the tests.Where the processor includes a sensitivity adjustment, this shall be set for maximumsensitivity.The sensor under test shall be moved slowly across the surface of the glass while thesignal amplitude and the sweep rate applied to the test probe are varied, in order todetermine the minimum signal amplitude at which reliable detection takes place. Thisvalue shall be recorded.NOTES1Where the signal processing used in the detector is not compatible with the above test, the manu-facturer may propose an alternative but equivalent test.2 This test is designed to provide a relative measurement of sensitivity between a number of sensors ordetectors or a relative measurement of sensitivity of a single sensor or detector before and after environ-mental conditioning. It is not designed to demonstrate that a
...

IEC 60811-505
®

Edition 1.0 2012-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Electric and optical fibre cables – Test methods for non-metallic materials –
Part 505: Mechanical tests – Elongation at low temperature for insulations
and sheaths

Câbles électriques et à fibres optiques – Méthodes d’essai pour les matériaux
non-métalliques –
Partie 505: Essais mécaniques – Essai d’allongement à basse température
pour les enveloppes isolantes et les gaines

IEC 60811-505:2012

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---------------------- Page: 2 ----------------------
IEC 60811-505

®


Edition 1.0 2012-03




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Electric and optical fibre cables – Test methods for non-metallic materials –

Part 505: Mechanical tests – Elongation at low temperature for insulations

and sheaths




Câbles électriques et à fibres optiques – Méthodes d’essai pour les matériaux

non-métalliques –


Partie 505: Essais mécaniques – Essai d’allongement à basse température

pour les enveloppes isolantes et les gaines












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX L


ICS 29.035.01; 29.060.20 ISBN 978-2-88912-980-5



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 60811-505  IEC:2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Test method . 6
4.1 General . 6
4.2 Elongation test at low temperature for insulation . 7
4.2.1 Sampling . 7
4.2.2 Preparation of test pieces . 7
4.2.3 Apparatus . 7
4.2.4 Procedure and test conditions . 8
4.2.5 Evaluation of results . 8
4.3 Elongation test at low temperature for sheaths . 8
4.3.1 Sampling . 8
4.3.2 Preparation of test pieces . 8
4.3.3 Apparatus . 9
4.3.4 Procedure and test conditions . 9
4.3.5 Evaluation of results . 9
5 Test report. 9
Bibliography . 11

Figure 1 – Dumb-bell test piece . 10
Figure 2 – Small dumb-bell test piece . 10

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60811-505  IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRIC AND OPTICAL FIBRE CABLES –
TEST METHODS FOR NON-METALLIC MATERIALS –

Part 505: Mechanical tests –
Elongation at low temperature for insulations and sheaths


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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60811-505 has been prepared by IEC technical committee 20:
Electric cables.
This Part 505 of IEC 60811 cancels and replaces 8.3 and 8.4 of IEC 60811-1-4:1985, which is
withdrawn. Full details of the replacements are shown in Annex A of IEC 60811-100:2012.
There are no specific technical changes with respect to the previous edition, but see the
Foreword to IEC 60811-100:2012.

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– 4 – 60811-505  IEC:2012
The text of this standard is based on the following documents:
FDIS Report on voting
20/1301/FDIS 20/1350/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.
This part of IEC 60811 shall be used in conjunction with IEC 60811-100.
A list of all the parts in the IEC 60811 series, published under the general title Electric and
optical fibre cables – Test methods for non-metallic materials, can be found on the IEC
website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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60811-505  IEC:2012 – 5 –
INTRODUCTION
The IEC 60811 series specifies the test methods to be used for testing non-metallic materials
of all types of cables. These test methods are intended to be referenced in standards for
cable construction and for cable materials.
NOTE 1 Non-metallic materials are typically used for insulating, sheathing, bedding, filling or taping within cables.
NOTE 2 These test methods are accepted as basic and fundamental and have been developed and used over
many years principally for the materials in all energy cables. They have also been widely accepted and used for
other cables, in particular optical fibre cables, communication and control cables and cables for ships and offshore
applications.

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– 6 – 60811-505  IEC:2012
ELECTRIC AND OPTICAL FIBRE CABLES –
TEST METHODS FOR NON-METALLIC MATERIALS –

Part 505: Mechanical tests –
Elongation at low temperature for insulations and sheaths



1 Scope
This Part 505 of IEC 60811 gives the procedure for performing elongation tests at low
temperature on extruded insulations and sheaths.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60811-100:2012, Electric and optical fibre cables – Test methods for non-metallic

materials – Part 100: General
IEC 60811-501, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 501: Mechanical tests – Tests for determining the mechanical properties of insulating and

sheathing compounds
IEC 60811-504, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 504: Mechanical tests – Bending tests at low temperature for insulation and sheaths
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60811-100 apply.
4 Test method
4.1 General
This part of IEC 60811 shall be used in conjunction with IEC 60811-100.
All the tests shall be carried out not less than 16 h after the extrusion of the insulating or
sheathing compounds.
Tests shall be carried out at the temperature specified in the relevant cable standard.
For tests on insulation, the test is intended for insulated conductors of circular cross-section
having an external diameter greater than 12,5 mm and for sector-shaped cores large enough
to prepare dumb-bells. Where it is not possible to prepare dumb-bells, a bending test suitable
for testing the performance of cores of smaller diameter is described in IEC 60811-504.
This test is intended for the sheaths of cables not subjected to the bend test as specified in
IEC 60811-504. It is intended for cables with an overall diameter over 12,5 mm, or for flat
cables having, a major axis dimension over 12,5 mm. Cables with an overall diameter up to

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60811-505  IEC:2012 – 7 –
and including 12,5 mm shall be subjected to the low temperature bending test detailed in
IEC 60811-504.
4.2 Elongation test at low temperature for insulation
4.2.1 Sampling
Each core to be tested shall be represented by two samples of suitable length.
4.2.2 Preparation of test pieces
After all covering (including outer semi-conducting layer, if any) has been removed, the
insulation shall be cut open in the direction of the axis, after which the conductor and the
internal semi-conducting layer, if any, shall be removed.
The insulation need not be ground or cut if the inner and outer surfaces are smooth, and its
mean specified thickness does not exceed 2,0 mm. Samples having a thickness exceeding
this limit, or samples having imprints or ridges on the inner side, shall be ground or cut to
obtain two parallel and smooth surfaces, and a thickness which does not exceed 2,0 mm. The
minimum thickness after grinding or cutting shall be 0,8 mm but if the original thickness of the
insulation does not allow it, then 0,6 mm shall be permitted as the minimum thickness.
Grinding and cutting shall be carefully carried out to avoid undue heating and mechanical
stresses in the insulation.
All strips shall be conditioned at ambient temperature for at least 3 h.
After this preparation, two dumb-bells from each sample in accordance with Figure 1, or if
necessary Figure 2, shall be punched in the direction of the axis of each sample; if possible,
two dumb-bells shall be punched side by side.
For sector-shaped cores, the dumb-bells shall be punched out of the rounded “back” of the
core.
If an apparatus is used which allows the direct measurement of the distance between the
marker lines during the test, the dumb-bells shall be marked in accordance with
IEC 60811-501.
4.2.3 Apparatus
The test may be carried out on a machine provided with a cooling device or on a machine
installed in a cooling chamber.
Using a liquid as the refrigerant, the conditioning time shall be not less than 10 min at the
specified test temperature.
When cooling in air, the conditioning time for cooling the apparatus and test piece together
shall be at least 4 h. If the apparatus has been pre-cooled, this period may be reduced to 2 h,
and if the apparatus and test piece have been pre-cooled, the conditioning time after the test
piece has been fixed in the apparatus shall be not less than 1 h.
If a liquid mixture is used for cooling, it shall not impair the insulating or sheathing material.
An apparatus which allows direct measurement of the distance between the marker lines
during the elongation test is preferred, but it is also permissible to use an apparatus with
which the displacement between the grips can be measured.

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– 8 – 60811-505  IEC:2012
4.2.4 Procedure and test conditions
The grips of the tensile apparatus shall be of a non-self-tightening type. In both pre-cooled
grips, the dumb-bell shall be clamped over the same length.
The free length between the grips shall be about 30 mm for both types of dumb-bells if the
direct measurement of the distance between the marker lines is to be made during the test.
If the displacement of the grips is to be measured, the free length between the grips shall be
(30 ± 0,5) mm for the dumb-bell in accordance with Figure 1, and (22 ± 0,5) mm for the dumb-
bell in accordance with Figure 2.
The speed of separation of the grips of the tensile machine shall be (25 ± 5) mm/min.
The test temperature shall be as specified for the type of compound in the standard for the
type of cable.
The elongation shall be determined by measuring the distance between the marker lines, if
possible, or between the grips at the moment of the rupture.
4.2.5 Evaluation of results
For calculating the elongation, the increase of the distance between the marker lines shall be
related to the initial distance of 20 mm (or 10 mm if the dumb-bell in accordance with
Figure 2, is used), and expressed as a percentage of this distance.
If the alternative method of measuring the distance between the grips is used, the increase of
this distance shall be related to the original distance, being 30 mm for the dumb-bell in
accordance with Figure 1, and 22 mm for the dumb-bell according to Figure 2. When this
method is used, the test piece shall be examined before being removed from the apparatus; if
the test piece has partly slipped out of the grips, the result shall be ignored. At least three
valid results are required for calculating the elongation, otherwise the test shall be repeated.
Unless otherwise specified, none of the valid results shall be less than 20 %. In case of
dispute, the method employing marker lines shall be used.
4.3 Elongation test at low temperature for sheaths
4.3.1 Sampling
Each sheath to be tested shall be represented by two samples of suitable length.
4.3.2 Preparation of test pieces
After any covering has been removed, the sheath shall be cut open in the direction of the
axis, after which the cores and fillers and others internal parts (if any) shall be removed.
The sheath need not be ground or cut if the inner and outer surfaces are smooth, and its
mean specified thickness does not exceed 2,0 mm. Samples having a thickness exceeding
this limit, or samples having imprints or ridges on the inner side, shall be ground or cut to
obtain two parallel and smooth surfaces, and a thickness which does not exceed 2,0 mm. The
minimum thickness after grinding or cutting shall be 0,8 mm but if the original thickness of the
sheath does not allow it, then 0,6 mm shall be permitted as the minimum thickness. Grinding
and cutting shall be carefully carried out to avoid undue heating and mechanical stresses in
the sheath. For polyethylene (PE) and polypropylene (PP) sheaths, cutting only, not grinding
shall be employed. An example of a cutting machine is given in Annex A of
IEC 60811-501:2012.

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60811-505  IEC:2012 – 9 –
All strips shall be conditioned at ambient temperature for at least 3 h.
After this preparation, two dumb-bells from each sample in accordance with Figure 1, or if
necessary Figure 2, shall be punched in the direction of the axis of each sample; if possible,
two dumb-bells shall be punched side by side.
If an apparatus is used which allows direct measurement of the distance between the marker
lines during the test, the dumb-bells shall be marked in accordance with IEC 60811-501.
4.3.3 Apparatus
In accordance with 4.2.3.
4.3.4 Procedure and test conditions
In accordance with 4.2.4.
4.3.5 Evaluation of results
In accordance with 4.2.5.
5 Test report
The test report shall be in accordance with that given in IEC 60811-100.

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– 10 – 60811-505  IEC:2012

Dimensions in millimeters

IEC  260/12

Key
1 marker lines
Figure 1 – Dumb-bell test piece

Dimensions in millimeters

IEC  261/12

Key
1 marker lines
Figure 2 – Small dumb-bell test piece

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60811-505  IEC:2012 – 11 –
Bibliography
IEC 60811-1-4:1985, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section four – Test at low temperature
(withdrawn)

____________

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– 12 – 60811-505  CEI:2012
SOMMAIRE
AVANT-PROPOS . 13
INTRODUCTION . 15
1 Domaine d’application . 16
2 Références normatives . 16
3 Termes et définitions . 16
4 Méthode d’essai . 16
4.1 Généralités. 16
4.2 Essai d’allongement à basse température pour enveloppes isolantes . 17
4.2.1 Echantillon . 17
4.2.2 Préparation des éprouvettes . 17
4.2.3 Appareillage . 17
4.2.4 Mode opératoire et conditions d’essai . 18
4.2.5 Expression des résultats. 18
4.3 Essai d’allongement à basse température pour gaines . 18
4.3.1 Echantillon . 18
4.3.2 Préparation des éprouvettes . 18
4.3.3 Appareillage . 19
4.3.4 Mode opératoire et conditions d’essai . 19
4.3.5 Evaluation des résultats . 19
5 Rapport d’essai . 19
Bibliographie . 21

Figure 1 – Eprouvette en forme d’haltère . 20
Figure 2 – Petite éprouvette en forme d’haltère . 20

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60811-505  CEI:2012 – 13 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________

CÂBLES ÉLECTRIQUES ET À FIBRES OPTIQUES –
MÉTHODES D’ESSAI POUR LES MATÉRIAUX NON-MÉTALLIQUES –

Partie 505: Essais mécaniques –
Essai d’allongement à basse température
pour les enveloppes isolantes et les gaines


AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
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internationales, des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au
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également aux travaux. La CEI collabore étroitement avec l'Organisation Internationale de Normalisation (ISO),
selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de la CEI
intéressés sont représentés dans chaque comité d’études.
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mesure possible, à appliquer de façon transparente les Publications de la CEI dans leurs publications
nationales et régionales. Toutes divergences entre toutes Publications de la CEI et toutes publications
nationales ou régionales correspondantes doivent être indiquées en ter
...