prEN 50290-2-34:2016
(Main)Communication cables - Part 2-34: Common design rules and construction - Polyethylene sheathing compound for outdoor optical fibre cables
Communication cables - Part 2-34: Common design rules and construction - Polyethylene sheathing compound for outdoor optical fibre cables
This Part 2-XX of EN 50290 gives specific requirements for PE Sheathing compound for outdoor optical fibre cables
Kommunikationskabel - Teil 2-34: Gemeinsame Regeln für Entwicklung und Konstruktion – Polyethylen-Mantelmischung für Lichtwellenleiter-Aussenkabel
Câbles de communication - Partie 2-34: Règles de conception communes et construction - Mélange à base de polyéthylène pour gainage destiné aux câbles extérieurs à fibres optiques
Komunikacijski kabli - 2-34. del: Skupna pravila za snovanje in konstruiranje - Polietilenska zmes za oplaščenje zunanjih optičnih kablov
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2016
.RPXQLNDFLMVNLNDEOLGHO 6NXSQDSUDYLOD]DVQRYDQMHLQNRQVWUXLUDQMH
3ROLHWLOHQVND]PHV]DRSODãþHQMH]XQDQMLKRSWLþQLKNDEORY
Communication cables - Part 2-34: Common design rules and construction -
Polyethylene sheathing compound for outdoor optical fibre cables
Câbles de communication - Partie 2-34: Règles de conception communes et construction
- Mélange à base de polyéthylène pour gainage destiné aux câbles extérieurs à fibres
optiques
Ta slovenski standard je istoveten z: prEN 50290-2-34:2016
ICS:
29.035.20 3ODVWLþQLLQJXPHQLL]RODFLMVNL Plastics and rubber insulating
PDWHULDOL materials
33.120.10 Koaksialni kabli. Valovodi Coaxial cables. Waveguides
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD DRAFT
prEN 50290-2-34
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2016
ICS 29.035.20; 33.120.10
English Version
Communication cables - Part 2-34: Common design rules and
construction - Polyethylene sheathing compound for outdoor
optical fibre cables
Câbles de communication - Partie 2-34: Règles de To be completed
conception communes et construction - Mélange à base de
polyéthylène pour gainage destiné aux câbles extérieurs à
fibres optiques
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2016-06-17.
It has been drawn up by CLC/TC 46X.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CENELEC 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 CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 24906 Ref. No. prEN 50290-2-34:2016 E
1 Contents
3 European foreword . 3
4 Scope . 4
5 2 Normative references . 4
6 3 Compound test requirements . 5
7 Cable test requirements . 5
8 5 Cable sheath shrinkage. 5
9 6 Ageing considerations . 6
10 Health, safety and environmental (HSE) regulations . 6
11 Annex A (informative) Guidelines for the selection of sheathing compounds for fibre optic
12 cables . 10
13 Bibliography . 12
15 European foreword
16 This document (prEN 50290-2-34:2016) has been prepared by a joint working group of the Technical
17 Committees CENELEC TC 46X, "Communication cables", and CENELEC TC 86A, "Optical fibres and optical
18 fibre cables".
19 This document is currently submitted to the Enquiry.
20 The following dates are proposed:
• latest date by which the existence of (doa) dor + 6 months
this document has to be announced
at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to (to be confirmed or
be withdrawn modified when voting)
21 1 Scope
22 This Part 2-34 of EN 50290 gives specific requirements for polyethylene compounds, as given in Table 1, to be
23 used for low shrinkage sheathing elements of fibre optic cables. All the compounds in this standard are suitable
24 for sheathing cables to be used in outside plant having a maximum operating temperature of 70 °C. In addition,
25 EN 50290-2-34 will give guidance in the selection of polyethylenes for other applications where low sheath
26 retraction is necessary. It is to be read in conjunction with EN 50290-2-20, the product standard EN 60794-3
27 and other applicable product standards.
28 Using raw material and type test data as outlined in this standard, the raw material supplier will have sufficient
29 data to demonstrate compliance and warrant that the material is suitable for the specified application.
30 There are several routes used for manufacture of Polyethylene and as a consequence a number of different
31 types of polyethylene are defined as given in Table 1.
32 Table 1 – Polyethylene materials (informative)
Abbreviation Material type Reactor process Polymer structure
LDPE Low density High pressure/ Long chain
polyethylene temperature radical branched
reaction
LLDPE Linear low Low pressure/ Significant short
density temperature catalytic chain branching
polyethylene reaction
MDPE Medium density Low pressure/ Short chain
polyethylene temperature catalytic branched
reaction
HDPE High density Low pressure/ Limited short chain
polyethylene temperature catalytic branching
reaction
1 Upper process capability for density 0,930 g/ml. Normally density range 0,917-0,925
g/ml.
33 2 Normative references
34 The following documents, in whole or in part, are normatively referenced in this document and are indispensable
35 for its application. For dated references, only the edition cited applies. For undated references, the latest edition
36 of the referenced document (including any amendments) applies.
37 EN 60811-401, Electric and optical fibre cables - Test methods for non-metallic materials - Part 401:
38 Miscellaneous tests - Thermal ageing methods - Ageing in an air oven (IEC 60811-401)
39 EN 60811-406, Electric and optical fibre cables - Test methods for non-metallic materials - Part 406:
40 Miscellaneous tests - Resistance to stress cracking of polyethylene and polypropylene compounds (IEC 60811-
41 406)
42 EN 60811-407, Electric and optical fibre cables - Test methods for non-metallic materials - Part 407:
43 Miscellaneous tests - Measurement of mass increase of polyethylene and polypropylene compounds (IEC
44 60811-407)
45 EN 60811-501, Electric and optical fibre cables - Test methods for non-metallic materials - Part 501: Mechanical
46 tests - Tests for determining the mechanical properties of insulating and sheathing compounds (IEC 60811-501)
47 EN 60811-511, Electric and optical fibre cables - Test methods for non-metallic materials - Part 511: Mechanical
48 tests - Measurement of the melt flow index of polyethylene compounds (IEC 60811-511)
49 EN 60811-512, Electric and optical fibre cables - Test methods for non-metallic materials - Part 512: Mechanical
50 tests - Methods specific to polyethylene and polypropylene compounds - Tensile strength and elongation at
51 break after conditioning at elevated temperature (IEC 60811-512)
52 EN 60811-605, Electric and optical fibre cables - Test methods for non-metallic materials - Part 605: Physical
53 tests - Measurement of carbon black and/or mineral filler in polyethylene compounds (IEC 60811-605)
54 EN 60811-606, Electric and optical fibre cables - Test methods for non-metallic materials - Part 606: Physical
55 tests - Methods for determining the density (IEC 60811-606)
56 EN 60811-607, Electric and optical fibre cables - Test methods for non-metallic materials - Part 607: Physical
57 tests - Test for the assessment of carbon black dispersion in polyethylene and polypropylene (IEC 60811-607)
58 EN 60794-3, Optical fibre cables - Part 3: Sectional specification - Outdoor cables (IEC 60794-3)
59 EN 50290-2-20, Communication cables - Part 2-20: Common design rules and construction - General
60 EN ISO 178, Plastics - Determination of flexural properties (ISO 178)
61 EN ISO 527, Plastics – Determination of tensile properties (ISO 527)
62 EN ISO 868, Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore
63 hardness) (ISO 868)
64 EN ISO 11357-6, Plastics - Differential scanning calorimetry (DSC) - Part 6: Determination of oxidation induction
65 time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)
66 ISO 974, Plastics — Determination of the brittleness temperature by impact
67 3 Compound test requirements
68 The tests are to be carried out on granules or moulded plaques produced from granules of compound. Specific
69 requirements are shown in Table 2. This data shall be provided by the compound supplier. Relevant test
70 methods, requirements and limits shall be included in any supply specification of the compound.
71 In the case of special applications, additional requirements could be specified.
72 4 Cable test requirements
73 The anticipated performance assumes standard cable design and conventional process technology and is
74 specified in Table 3. Using type test data the compound supplier is expected to demonstrate compliance and
75 warrant that the material is suitable for the specified application.
76 In the case of special applications, additional requirements could be specified.
77 5 Cable sheath shrinkage
78 At processing temperatures polyethylene has an amorphous structure with a density (0,800 g/ml – 0,820 g/ml)
79 dependent only on the melt temperature. On cooling to room temperature the polymer will partially crystallise
80 with a resulting increase in density (0,915 g/m – 0,965 g/ml). The potential cable shrinkage is partially a
81 consequence on this change in density.
82 Shrinkage deformation is a consequence of stress arising from the change in density and volume reduction
83 induced by crystallization as well as the orientation and the stretching of the polymers during extrusion.
84 Provided these stresses can relax within the time constraints of the cooling process the resulting cable sheath
85 will be dimensionally stable. In the case where these stresses cannot relax the sheath will tend to exhibit post
86 manufacture shrinkage as a result of temperature cycling. Stress relaxation characteristics can be determined
87 by melt deformation experiments and the link between the polymer relaxation spectra and cable shrinkage has
88 been reported (see Bibliography). Further guidance on polymer selection is contained in Annex A.
89 6 Ageing considerations
90 Natural or coloured polyolefin cable sheaths, containing conventional antioxidant stabilisers degrade rapidly
91 when subjected to natural daylight weathering through photo-catalysed oxidation (actinic degradation).
92 Degradation is manifested by discolouration of the sheath followed immediately by loss of mechanical properties
93 and spontaneous cracking. This ageing process is accelerated in situations where the sheath is physically
94 stressed, for example at sharp bends. Under temperate European climates failure can occur within two years of
95 exposure. Ageing will not only occur on installed cables but also on cables stored externally on drums or reels
96 where the cables have been inadequately protected from solar radiation.
97 Ultraviolet stabilisation systems shall be incorporated in the natural sheath compound to extend the induction
98 period before the onset of failure in external applications. The best ultraviolet protection is a minimum of 2 % of
99 well dispersed carbon black (see Table 2).
100 7 Health, safety and environmental (HSE) regulations
101 The compounds are subject to Health, Safety and Environmental requirements as defined in EN 50290-2-20.
102 Any deviations or compliance failures must be identified by the compound supplier and necessary corrective
103 actions to be undertaken agreed with cable maker.
Table 2 – Polyethylene sheathing compounds - physical properties of granules
1)
Characteristics Test method Unit Types
LD LLD MD HD
> 0,925
2) 3) 3
1 Density EN 60811-606 g/cm ≤ 0,925 ≤ 0,925 > 0,940
≤ 0,940
4)
2 Melt flow index (190 °C/2,16 kg) EN 60811-511 To be reported by the supplier
4)
3 Flow Rate Ratio (MFR(21,6)/MFR(2,16)) EN 60811-511 To be reported by the supplier
4 Hardness Shore D (1 s) EN ISO 868
...
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