EN 60794-3-60:2008

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.]LURPDLichtwellenleiterkabel - Teil 3-60: Außenkabel - Familienspezifikation für Kabel in Trinkwasserleitungen und Schächten für die Verlegung durch Einblasen und/oder Einschieben/Einziehen/Eingleiten in Trinkwasserleitungen (IEC 60794-3-60:2008)Câbles à fibres optiques - Partie 3-60: Câbles extérieurs - Spécification de famille relative aux câbles et sous-conduits cheminant dans les conduites d'eau potable destinés à être installés par soufflage et/ou par tirage/appareillage trainant/flottaison dans les conduites d'eau potable (CEI 60794-3-60:2008)Optical fibre cables - Part 3-60: Outdoor cables - Family specification for drinking water pipe cables and subducts for installation by blowing and/or pulling/dragging/floating in drinking water pipes (IEC 60794-3-60:2008)33.180.10Fibres and cablesICS:Ta slovenski standard je istoveten z:EN 60794-3-60:2008SIST EN 60794-3-60:2009en01-februar-2009SIST EN 60794-3-60:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD EN 60794-3-60 NORME EUROPÉENNE
EUROPÄISCHE NORM December 2008
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60794-3-60:2008 E
ICS 33.180.10
English version
Optical fibre cables -
Part 3-60: Outdoor cables -
Family specification for drinking water pipe cables and subducts
for installation by blowing and/or pulling/dragging/floating
in drinking water pipes (IEC 60794-3-60:2008)
Câbles à fibres optiques -
Partie 3-60: Câbles extérieurs -
Spécification de famille
relative aux câbles et sous-conduits cheminant dans les conduites d'eau potable destinés à être
installés par soufflage et/ou
par tirage/appareillage trainant/flottaison dans les conduites d'eau potable (CEI 60794-3-60:2008)
Lichtwellenleiterkabel -
Teil 3-60: Außenkabel -
Familienspezifikation
für Kabel in Trinkwasserleitungen
und Schächten für die Verlegung
durch Einblasen und/oder Einschieben/Einziehen/Eingleiten
in Trinkwasserleitungen (IEC 60794-3-60:2008)
This European Standard was approved by CENELEC on 2008-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, 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.

- 2 -
Foreword The text of document 86A/1232/FDIS, future edition 1 of IEC 60794-3-60, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60794-3-60 on 2008-11-01. This standard is to be used in conjunction with EN 60794-1-1, EN 60794-1-2 and EN 60794-3. 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)
2009-08-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2011-11-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 60794-3-60:2008 was approved by CENELEC as a European Standard without any modification. __________

- 3 - EN 60794-3-60:2008 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
IEC 60304 1982 Standard colours for insulation for low-frequency cables and wires HD 402 S2 1984
IEC 60793-1-20 -1) Optical fibres -
Part 1-20: Measurement methods and test procedures - Fibre geometry EN 60793-1-20 20022)
IEC 60793-1-40 (mod) -1) Optical fibres -
Part 1-40: Measurement methods and test procedures - Attenuation EN 60793-1-40 20032)
IEC 60793-1-44 -1) Optical fibres -
Part 1-44: Measurement methods and test procedures - Cut-off wavelength EN 60793-1-44 20022)
IEC 60793-2 -1) Optical fibres -
Part 2: Product specifications - General EN 60793-2 20082)
IEC 60793-2-50 -1) Optical fibres -
Part 2-50: Product specifications - Sectional specification for class B single-mode fibres EN 60793-2-50 20082)
IEC 60794-1-1 -1) Optical fibre cables -
Part 1-1: Generic specification - General EN 60794-1-1 20022)
IEC 60794-1-2 -1) Optical fibre cables -
Part 1-2: Generic specification - Basic optical cable test procedures EN 60794-1-2 20032)
IEC 60794-3 -1) Optical fibre cables -
Part 3: Sectional specification - Outdoor cables EN 60794-3 20022)
IEC 60794-3-10 (mod) -1) Optical fibre cables -
Part 3-10: Outdoor cables - Family specification for duct and directly buried optical telecommunication cables EN 60794-3-10 20022)
IEC 60811-1-1 1993 Insulating and sheathing materials of electric and optical cables - Common test methods - Part 1-1: General application - Measurement of thickness and overall dimensions - Tests for determining the mechanical properties EN 60811-1-1 1995
1) Undated reference. 2) Valid edition at date of issue.

- 4 -
Publication Year Title EN/HD Year
IEC 60811-5-1 (mod) 1990 Insulating and sheathing materials of electric and optical cables - Common test methods - Part 5-1: Methods specific to filling compounds - Drop point - Separation of oil - Lower temperature brittleness - Total acid number - Absence of corrosive components - Permittivity at 23 °C - D.C. resistivity at 23 °C and 100 °C EN 60811-5-1 1999
IEC 62305-1 -1) Protection against lightning -
Part 1: General principles EN 62305-1 + corr. November
20062) 2006
IEC 60794-3-60Edition 1.0 2008-10INTERNATIONAL STANDARD
Optical fibre cables –
Part 3-60: Outdoor cables – Family specification for drinking water pipe cables and subducts for installation by blowing and/or pulling/dragging/floating in drinking water pipes
INTERNATIONAL ELECTROTECHNICAL COMMISSION VICS 33.180.10 PRICE CODEISBN 2-8318-1002-6
– 2 – 60794-3-60 © IEC:2008(E) CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.6 3 Symbols and abbreviations.7 4 Family specification for drinking water pipe cables and subducts for installation by blowing and/or pulling/dragging/floating in drinking water pipes (blank detail specification and minimum requirements).8 4.1 Construction.8 4.1.1 General.8 4.1.2 Subducts.8 4.1.3 Drinking water pipe cables.8 4.2 Optical fibres.9 4.2.1 Single-mode dispersion unshifted (B1.1) optical fibre.9 4.2.2 Single-mode dispersion shifted (B2) optical fibre.9 4.2.3 Single-mode non-zero dispersion (B4) optical fibre.10 4.2.4 Single-mode (B6) optical fibre.10 4.2.5 Multimode fibres.10 4.3 Drinking water pipe cable constructions.11 4.3.1 Cable for installation within subducts (previously installed within the drinking water pipe).11 4.3.2 Cable for direct installation into the drinking water pipes.12 4.3.3 Subduct construction.13 4.4 Installation and operating conditions.13 4.4.1 Tests applicable to cables/cable elements.13 4.4.2 Installation conditions.13 4.5 Mechanical and environmental tests.14 4.5.1 Subducts.14 4.5.2 Cable for installation within subducts (previously installed into the drinking water pipes).17 4.5.3 Cables for direct installation into the drinking water pipe.21 Annex A (informative)
Blank detail specification.25 Annex B (informative)
OF cables for drinking water pipes.28 Annex C (informative)
Examples of subducts and drinking water pipe cables.29 Annex D (informative)
Example for installation schemes of optical fibre cables in drinking water pipes (fibre in drinking water pipes).31
Figure C.1 – Examples of constructions of cables for installation in subducts within drinking water pipes.29 Figure C.2 – Examples of constructions for drinking water pipe cables.30 Figure D.1 – Schematic drawing – I/O-port for OF cables into drinking water lines.31 Figure D.2 – Schematic drawing – Installation of OF cables in drinking water lines.32 Figure D.3 – Installation of I/O-ports on high pressure PE drinking water pipe.32
Table 1 – Single-mode dispersion unshifted (B1.1) optical fibre.9 Table 2 – Single-mode dispersion shifted (B2) optical fibre.9 Table 3 – Single-mode non-zero dispersion (B4) optical fibre.10

60794-3-60 © IEC:2008(E) – 3 – Table 4 – Single-mode (B6) optical fibre.10 Table 5 – Characteristics – Cable for installation within subducts.11 Table 6 – Characteristics – Cable for direct installation within the high pressure gas pipe.12 Table 7 – Characteristics – Subduct construction.13 Table 8 – Tests applicable to cables/cable elements.13 Table 9 – Subducts
tests applicable.14 Table 10 – Tests applicable to the cable for installation within subducts.17 Table 11 – Tests applicable to the cables for direct installation into the drinking water pipe.21 Table A.1 – Cable for installation within subducts.25 Table A.2 – Cables for direct installation into the drinking water pipes.26 Table A.3 – Subduct description.27 Table B.1 – OF cables for drinking water pipes.28

– 4 – 60794-3-60 © IEC:2008(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _____________
OPTICAL FIBRE CABLES –
Part 3-60: Outdoor cables –
Family specification for drinking water pipe
cables and subducts for installation by blowing and/or
pulling/dragging/floating in drinking water pipes
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 60794-3-60 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This standard is to be used in conjunction with IEC 60794-1-1, IEC 60794-1-2 and
IEC 60794-3. The text of this standard is based on the following documents: FDIS Report on voting 86A/1232/FDIS 86A/1243/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.

60794-3-60 © IEC:2008(E) – 5 – This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 60794 series, under the general title Optical fibre cables, can be found on the IEC website. 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. A bilingual version of this publication may be issued at a later date.

– 6 – 60794-3-60 © IEC:2008(E) OPTICAL FIBRE CABLES –
Part 3-60: Outdoor cables –
Family specification for drinking water pipe
cables and subducts for installation by blowing and/or
pulling/dragging/floating in drinking water pipes
1 Scope This part of IEC 60794 is a family specification that covers drinking water pipe cables and subducts for installation by blowing and/or pulling/dragging/floating in drinking water pipes. Systems built with components covered by this standard are subject to the requirements of sectional specification IEC 60794-3. Drinking water pipe cable and subduct constructions have to meet the different requirements of the drinking water companies and/or associations regarding chemical, environmental, operational interactions and in general maintenance conditions. A table of preferential applications, describing drinking water pipe cable characteristics versus methods of installation is reported in Annex A for drinking water pipe cables. Clause 4 describes a blank detail specification for drinking water pipe cables and subducts for installation by blowing and/or pulling/dragging/floating in drinking water pipes. It incorporates some minimum requirements.
Detail specifications may be prepared on the basis of this family specification. The parameters specified in this standard may be affected by measurement uncertainty arising either from measurement errors or calibration errors due to lack of suitable standards. Acceptance criteria should be interpreted with respect to this consideration. The number of fibres tested is representative of the drinking water line cable and should be agreed between the customer and the supplier. 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 60304, 1982: Standard colours for insulation for low-frequency cables and wires
IEC 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre geometry
IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures – Attenuation
IEC 60793-1-44, Optical fibres – Part 1-44: Measurement methods and test procedures – Cut-off wavelength
IEC 60793-2, Optical fibres – Part 2: Product specifications – General

60794-3-60 © IEC:2008(E) – 7 – IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for class B single-mode fibres IEC 60794-1-1, Optical fibre cables – Part 1-1: Generic specification – General
IEC 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test procedures
IEC 60794-3, Optical fibre cables – Part 3: Sectional specification – Outdoor cables
IEC 60794-3-10, Optical fibre cables – Part 3-10: Outdoor cables – Family specification for duct and directly buried optical telecommunication cables IEC 60811-1-1, 1993: Common test methods for insulating and sheathing materials of electric cables and optical cables – Part 1-1: Methods for general application – Measurement of thickness and overall dimensions – Tests for determining the mechanical properties
IEC 60811-5-1,1990: Insulating and sheathing materials of electric and optical cables – Common test methods – Part 5-1: Methods specific to filling compounds – Drop-point – Separation of oil – Lower temperature brittleness – Total acid number – Absence of corrosive components – Permittivity at 23 °C – DC resistivity at 23 °C and 100 °C
IEC 62305-1, Protection against lightning – Part 1: General principles 3 Symbols and abbreviations For the purposes of this document, the following symbols and abbreviations apply. CC cabled fibre cut-off wavelength d nominal outer diameter of the cable dc
nominal outer diameter of the subduct DS detail specification TO threshold tensile load below which no attenuation and/or fibre strain increase should occur in the tensile performance test TM the acceptable amount of short-term tensile load that can be applied to the cable without permanent degradation of the characteristics of the fibres in the tensile performance test TA1 temperature cycling test low-temperature limit according to IEC 60794-1-2, method F1 TA2 temperature cycling test low-temperature limit according to IEC 60794-1-2, method F1 TB1 temperature cycling test high-temperature limit according to IEC 60794-1-2, method F1 TB2 temperature cycling test high-temperature limit according to IEC 60794-1-2, method F1
t1 temperature cycling dwell time n x d a value times cable outer diameter used for bends, mandrels, etc. PE polyethylene I/O-port input/output port for launching OF cables into and out of the gas pipe APL
aluminium/polyethylene laminate SPL steel/polyethylene laminate

– 8 – 60794-3-60 © IEC:2008(E) 4 Family specification for drinking water pipe cables and subducts for installation by blowing and/or pulling/dragging/floating in drinking water pipes (blank detail specification and minimum requirements) 4.1 Construction 4.1.1 General In addition to the constructional requirements of sectional specification IEC 60794-3, the following considerations apply to the drinking water pipe cables and/or subducts. The drinking water pipe cables and/or subducts shall be designed and manufactured for an expected operating lifetime of at least 10 years. It shall be possible to install or remove the cable in or from the drinking water pipe throughout the operational lifetime. The materials in the drinking water pipe cable and/or as well as accessories including sealing elements, i.e. I/O-ports and subducts shall not present a health hazard within its intended use. 4.1.2 Subducts In the case of use, the subduct with outer nominal diameters ranging from 10 mm to 100 mm shall be able to resist pressure differences needed for installation by blowing and able to withstand the water pressure within the drinking water pipe. They shall be circular and the outer and inner surfaces a low coefficient of friction. The material shall withstand all possible chemical attacks by the drinking water itself, as for instance the PE tube material used by the water supply companies. Inner- and outer-diameter and overall minimum wall thickness shall be specified. 4.1.3 Drinking water pipe cables A drinking water pipe cable in accordance with this specification should be suitable for installation in drinking water pipes by the following installation methods, also applicable the access drinking water pipe work: – blowing and/or pulling into a subduct, previously installed into the drinking water pipe between two I/O-ports; – direct installation into the drinking water pipe between two adjacent I/O-ports. The attenuation of the installed cable at the operational wavelength(s) shall not exceed values agreed between the customer and the supplier. There shall be no fibre splice in a delivery length unless otherwise agreed by the customer and the supplier. It shall be possible to identify each individual fibre throughout the length of the drinking water line cable.

60794-3-60 © IEC:2008(E) – 9 – 4.2 Optical fibres 4.2.1 Single-mode dispersion unshifted (B1.1) optical fibre Table 1 – Single-mode dispersion unshifted (B1.1) optical fibre Characteristics
(9) IEC 60794-3 Clause/subclause (10) Family requirements (11) Test methods
(12) Remarks
(13) Uncabled optical fibre 5 IEC 60793-2-50
Attenuation coefficient (cabled fibres) 5.2.1 According to DS IEC 60793-1-40, method A, B or C
at 1 310 nm at 1 550 nm and at 1 625 nm1.
≤ 0,40 dB/km ≤ 0,35 dB/km ≤ 0,40 dB/km
Attenuation discontinuities at 1 310 nm and 1 550 nm 5.2.2 ≤ 0,10 dB IEC 60793-1-40, method C
Cabled fibre cut-off wavelength 5.3 CC <
operational IEC 60793-1-44, method B
Fibre colouring 5.4 IEC 60304 Visual inspection
Outer diameter including colouring 8.2.1.1 IEC 60793-2 IEC 60793-1-20, method D
4.2.2 Single-mode dispersion shifted (B2) optical fibre Table 2 – Single-mode dispersion shifted (B2) optical fibre Characteristics
(9) IEC 60794-3 Clause/subclause (10) Family requirements (11) Test methods
(12) Remarks
(13) Uncabled optical fibre 5.1 IEC 60793-2
Attenuation coefficient (cabled fibres)
at 1 550 nm
Attenuation discontinuities at 1 550 nm 5.2.1
5.2.1
5.2.2 According to DS
≤ 0,35 dB/km
≤ 0,10 dB/km IEC 60793-1-40, method A, B or C
IEC 60793-1-40, method C
Cabled fibre cut-off wavelength 5.3 CC <
operational IEC 60793-1-44, method B
Fibre colouring 5.4 IEC 60304 Visual inspection
Outer diameter including colouring 8.2.1.1 IEC 60793-2 IEC 60793-1-20, method D
___________ 1
Measurements at 1 625 nm are optional.

– 10 – 60794-3-60 © IEC:2008(E) 4.2.3 Single-mode non-zero dispersion (B4) optical fibre Table 3 – Single-mode non-zero dispersion (B4) optical fibre
Characteristics
(9) IEC 60794-3 Clause/subclause (10) Family requirements (11) Test methods
(12) Remarks
(13) Uncabled optical fibre 5.1 IEC 60793-2
Attenuation coefficient (cabled fibres)
at 1 550 nm at 1 6252 nm
Attenuation discontinuities at 1 550 nm 5.2.1
5.2.1
5.2.2 According to DS
≤ 0,35 dB/km ≤ 0,40 dB/km
≤ 0,10 dB/km IEC 60793-1-40, method A, B or C
IEC 60793-1-40, method C
Cabled fibre cut-off wavelength 5.3 CC <
operational IEC 60793-1-44, method B
Fibre colouring 5.4 IEC 60304 Visual inspection
Outer diameter including colouring 8.2.1.1 IEC 60793-2 IEC 60793-1-20, method D
4.2.4 Single-mode (B6) optical fibre Table 4 – Single-mode (B6) optical fibre
Characteristics
(9) IEC 60794-3 Clause/subclause (10) Family requirements (11) Test methods
(12) Remarks
(13) Uncabled optical fibre 5.1 IEC 60793-2
Attenuation coefficient (cabled fibres)
at 1 550 nm at 1 6253 nm
Attenuation discontinuities at 1 550 nm 5.2.1
5.2.1
5.2.2 According to DS
≤ 0,30 dB/km ≤ 0,40 dB/km
≤ 0,10 dB/km IEC 60793-1-40, method A, B or C
IEC 60793-1-40, method C
Cabled fibre cut-off wavelength 5.3 CC <
operational IEC 60793-1-44, method B
Fibre colouring 5.4 IEC 60304 Visual inspection
Outer diameter including colouring 8.2.1.1 IEC 60793-2 IEC 60793-1-20, method D
4.2.5 Multimode fibres Under consideration. ___________ 2 Measurements at 1 625 nm are optional 3 Measurements at 1 625 nm are optional

60794-3-60 © IEC:2008(E) – 11 – 4.3 Drinking water pipe cable constructions 4.3.1 Cable for installation within subducts (previously installed within the drinking water pipe) Table 5 – Characteristics – Cable for installation within subducts Characteristics
(9) IEC 60794-3 Clause/subclause (10) Family requirements (11) Test methods
(12) Remarks
(13) Lay-up 7.2 According to DS Visual inspection
Drinking water pipe cable core 7.3 According to DS
Filling compound (if used)
According to DS Either IEC 60794-1-2, method E14 or IEC 60811-5-1, Clause 4 IEC 60811-5-1, Clause 5 IEC 60811-5-1, Clause 8
Dry blocking compound 7.3 According to DS Under consideration
Strength member 7.4 According to DS Visual inspection
- central
- peripheral
Moisture barrier 7.5 According to DS
Metallic tapes (if any):
Outer cable sheath 7.6
Material
Minimum sheath thickness
According to DS IEC 60811-1-1
Outer cable diameter
According to DS IEC 60811-1-1
Optional protection
According to DS
Sheath marking 7.7
Configuration, dimensions
According to DS Visual inspection
Abrasion resistance
According to DS IEC 60794-1-2, method E2B Method 1 Steel needle diameter
d = 1,0 mm
load: 4 N Method 2 with felt pad consisting of either
a) water soaked wool felt or
b) rayon felt with < 30 % wool We
...