oSIST prEN 50290-2-24:2020

Communication cables - Part 2-24: Common design rules and construction - Polyethylene sheathing compounds

This document gives specific requirements for halogen free polyolefin based sheathing compounds used for halogen free communication cables with improved characteristics in the case of fire.
Compounds, described by this document, are commonly also named HFFR or HFFR-LS (halogen free, flame/fire retardant, low smoke), see also EN 50290 2 20.
It is expected to be read in conjunction with EN 50290 2 20, the product standards EN 50288 series, EN 60794 series and other applicable product standards.
Improved characteristics in the case of fire are demonstrated by specific fire tests on cables for flame/fire retardant applications (e.g. single or bunched cable fire test). Additional tests to prove the characteristics in case of fire, e.g. such as smoke emission test, might also be part of the dedicated product standard or specification.
This document describes the compound types as given in Table 1.
Table 1 — Sheathing compounds
Compound grades   Max. operating temperature   Comment
Type 1   70°C   thermoplastic standard
Type 2   90°C   thermoplastic, higher temperature
Type 3   90°C   crosslinked, higher temperature

Câbles de communication - Partie 2-24: Règles de conception communes et construction - Mélanges pour gaines en polyéthylène

Komunikacijski kabli - 2-24. del: Skupna pravila za načrtovanje in konstrukcija - Polietilenske zmesi za oplaščenje

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 50290-2-24:2020
01-september-2020

Komunikacijski kabli - 2-24. del: Skupna pravila za načrtovanje in konstrukcija -

Polietilenske zmesi za oplaščenje
Communication cables - Part 2-24: Common design rules and construction -
Polyethylene sheathing compounds
Ta slovenski standard je istoveten z: prEN 50290-2-24
ICS:
29.035.20 Plastični in gumeni izolacijski Plastics and rubber insulating
materiali materials
33.120.10 Koaksialni kabli. Valovodi Coaxial cables. Waveguides
oSIST prEN 50290-2-24:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 50290-2-24:2020
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oSIST prEN 50290-2-24:2020
EUROPEAN STANDARD DRAFT
prEN 50290-2-24
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2020
ICS Will supersede EN 50290-2-24:2002 and all of its
amendments and corrigenda (if any)
English Version
Communication cables - Part 2-24: Common design rules and
construction - Polyethylene sheathing compounds
To be completed To be completed
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2020-10-09.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Project: 68421 Ref. No. prEN 50290-2-24 E
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oSIST prEN 50290-2-24:2020
prEN 50290-2-24:2020 (E)
1 Contents Page

2 European foreword ................................................................................................................. 3

3 1 Scope .............................................................................................................................. 4

4 2 Normative references ....................................................................................................... 4

5 3 Terms and definitions ....................................................................................................... 5

6 4 Compound test requirements ............................................................................................ 5

7 5 Cable test requirements ................................................................................................... 5

8 6 Ageing considerations ...................................................................................................... 5

9 7 Health, safety and environmental (HSE) requirements ...................................................... 6

10 Bibliography .......................................................................................................................... 10

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prEN 50290-2-24:2020 (E)
12 European foreword

13 This document (prEN 50290-2-24:2020) has been prepared by CLC/TC 46X “Communication cables”.

14 This document is currently submitted to the Enquiry.
15 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
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 be (to be confirmed or
withdrawn modified when voting)

16 This document will supersede EN 50290-2-24:2002 and all of its amendments and corrigenda (if any).

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oSIST prEN 50290-2-24:2020
prEN 50290-2-24:2020 (E)
17 1 Scope

18 This document gives specific requirements for polyethylene sheathing compounds, as given in Table 1, for use

19 in inner and outer sheathing of communication cables including fibre optic cables.

20 It is expected to be read in conjunction with EN 50290-2-20, the product standards EN 50407 series,

21 EN 50117 series, EN 60794 series and other applicable product standards.

22 Using raw material and type test data as outlined in this document, the raw material supplier will have sufficient

23 data to demonstrate compliance and warrant that the material is suitable for the specified application.

24 There are several routes used for manufacture of polyethylene and as a consequence a number of different

25 types of polyethylene are defined as given in Table 1.
26 Table 1 — Polyethylene materials (informative)
Maximum operating
Abbreviation Material type Reactor process Polymer structure
temperature
°C
Low density High pressure/ temperature Long chain branched +70
LDPE
polyethylene radical reaction
LLDPE Linear low density Low pressure/ temperature Significant short chain +80
polyethylene catalytic reaction branching
MDPE Medium density Low pressure/ temperature Short chain branched +80
polyethylene catalytic reaction
HDPE High density Low pressure/ temperature Limited short chain +80
polyethylene catalytic reaction branching
Further guidance on operating temperature is contained in EN 50290–2-20

Upper process capability for density 0,930 g/ml. Normally density range 0,917–0,925 g/ml

27 2 Normative references

28 The following documents are referred to in the text in such a way that some or all of their content constitutes

29 requirements of this document. For dated references, only the edition cited applies. For undated references, the

30 latest edition of the referenced document (including any amendments) applies.

31 EN 50289-4-17, Communication cables - Specifications for test methods - Part 4-17: Test methods for UV

32 resistance evaluation of the sheath of electrical and optical fibre cable

33 EN 50290-2-20, Communication cables - Part 2-20: Common design rules and construction - General

34 EN 60811-406, Electric and optical fibre cables - Test methods for non-metallic materials - Part 406:

35 Miscellaneous tests - Resistance to stress cracking of polyethylene and polypropylene compounds

36 (IEC 60811-406)

37 EN 60811-407, Electric and optical fibre cables - Test methods for non-metallic materials - Part 407:

38 Miscellaneous tests - Measurement of mass increase of polyethylene and polypropylene compounds

39 (IEC 60811-407)

40 EN 60811-501, Electric and optical fibre cables - Test methods for non-metallic materials - Part 501: Mechanical

41 tests - Tests for determining the mechanical properties of insulating and sheathing compounds (IEC 60811-501)

42 EN 60811-511, Electric and optical fibre cables - Test methods for non-metallic materials - Part 511: Mechanical

43 tests - Measurement of the melt flow index of polyethylene compounds (IEC 60811-511)

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prEN 50290-2-24:2020 (E)

44 EN 60811-605, Electric and optical fibre cables - Test methods for non-metallic materials - Part 605: Physical

45 tests - Measurement of carbon black and/or mineral filler in polyethylene compounds (IEC 60811-605)

46 EN 60811-606, Electric and optical fibre cables - Test methods for non-metallic materials - Part 606: Physical

47 tests - Methods for determining the density (IEC 60811-606)

48 EN 60811-607, Electric and optical fibre cables - Test methods for non-metallic materials - Part 607: Physical

49 tests - Test for the assessment of carbon black dispersion in polyethylene and polypropylene (IEC 60811-607)

50 EN ISO 868, Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore

51 hardness) (ISO 868)
52 EN ISO 11357
...