BRITISH STANDARD
Multi-element metallic cables used in analogue and digital communication and control — Part 7: Sectional specification for instrumentation and control cables
The European Standard EN 50288-7:2005 has the status of a British Standard
ICS 33.120.10
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
BS EN 50288-7:2005
BS EN 50288-7:2005
National foreword This British Standard is the official English language version of EN 50288-7:2005. The UK participation in its preparation was entrusted to Technical Committee EPL/46, Cables, wires and waveguides, R.F. connectors and accessories for communication and signalling, which has the responsibility to: —
aid enquirers to understand the text;
—
present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed;
—
monitor related international and European developments and promulgate them in the UK.
A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 23 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.
Amendments issued since publication This British Standard was published under the authority of the Standards Policy and Strategy Committee on 21 December 2005 © BSI 21 December 2005
ISBN 0 580 47283 3
Amd. No.
Date
Comments
EUROPEAN STANDARD
EN 50288-7
NORME EUROPÉENNE EUROPÄISCHE NORM
September 2005
ICS 33.120.10
English version
Multi-element metallic cables used in analogue and digital communication and control Part 7: Sectional specification for instrumentation and control cables Câbles métalliques à éléments multiples utilisés pour les transmissions et les commandes analogiques et numériques Partie 7: Spécification intermédiaire pour les câbles d'instrumentation et de contrôle
Mehradrige metallische Datenund Kontrollkabel für analoge und digitale Übertragung Teil 7: Rahmenspezifikation für Instrumenten- und Kontrollkabel
This European Standard was approved by CENELEC on 2005-04-01. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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 © 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50288-7:2005 E
EN 50288-7:2005
-2-
Foreword This European Standard was prepared by SC 46XC, Multicore, Multipair and Quad Data communication cables, of Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50288-7 on 2005-04-01. This Part 7 is to be used in conjunction with EN 50288-1. 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)
2006-04-01
latest date by which the national standards conflicting with the EN have to be withdrawn
(dow)
2008-04-01
__________
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EN 50288-7:2005
Contents 1
Scope...........................................................................................................................5
2
Normative references...................................................................................................5
3
Definitions, symbols and abbreviations ........................................................................6
4
Cable construction .......................................................................................................6 4.1
Conductor ..........................................................................................................6
4.2
Insulation ...........................................................................................................7
4.3
Cable elements..................................................................................................7
4.4
Identification of cabling elements .......................................................................8
4.5
Screening of cabling elements ...........................................................................8
4.6
Cable make-up ..................................................................................................8
4.7
Filling compound................................................................................................8
4.8
Interstitial fillers ..................................................................................................8
4.9
Screening of the cable core ...............................................................................8
4.10 Moisture barriers................................................................................................9 4.11 Protective wrappings..........................................................................................9 4.12 Inner sheath.....................................................................................................10 4.13 Bedding layers .................................................................................................10 4.14 Metallic protection ............................................................................................10 4.15 Integral suspension strand...............................................................................11 4.16 Outer sheathing ...............................................................................................11 4.17 Fauna protection..............................................................................................11 4.18 Chemical and/or environmental protection .......................................................11
5
4.18.1
Lead sheath .......................................................................................12
4.18.2
Multi-layer sheath ...............................................................................12
Test methods and requirements for completed cables ...............................................12 5.1
Electrical tests..................................................................................................13 5.1.1
Low frequency and d.c. electrical measurements...............................13
5.2
Mechanical tests ..............................................................................................13
5.3
Environmental tests .........................................................................................14
5.4
Fire performance test methods ........................................................................14
Annex A (normative) Insulation thickness and concentricity - Selection of samples and evaluation of results.......................................................................................15 Annex B (normative) Copper braid screening .....................................................................16 Annex C (normative) Determination of cable dimensions ...................................................17 Annex D (informative) Thermocouple extension and compensating conductors .................22
EN 50288-7:2005
-4-
Table 1 – Minimum insulation thickness ...............................................................................7 Table B.1 – Braid wire diameter..........................................................................................16 Table C.1 – Steps to determine fictitious cable diameter ....................................................17 Table C.2 – Conductor diameters .......................................................................................18 Table C.3 – Lay up factors .................................................................................................19 Table C.4 – Crush factors...................................................................................................19 Table C.5 – Bedding radial thickness .................................................................................20 Table C.6 – Round armour wire..........................................................................................20 Table C.7 – Tape armour ...................................................................................................20 Table C.8 – Braid armour wire size.....................................................................................21 Table D.1 – Extension cables ............................................................................................22 Table D.2 – Compensating cables......................................................................................22
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1
EN 50288-7:2005
Scope
This sectional specification covers multi-element cables suitable for connecting instruments and control systems for analogue or digital signal transmission. They may or may not be screened and optionally may incorporate armouring and/or moisture or environmental protection layers. The cables shall have a mechanically robust construction and electrical transmission handling properties. The electrical, mechanical, transmission and environmental performance characteristics of the cables, related to their reference test methods are detailed. This sectional specification is to be read in conjunction with EN 50288-1, which contains the essential provisions for its application. Cables covered by this specification have maximum rated voltages of 90 V, 300 V and 500 V a.c. These cables shall not be connected directly to mains electricity supply or other low impedance sources. Multi-element cables for use in analogue, digital and control circuits are not designed to be used for power supply. These cables should be installed in accordance with the applicable local and national regulations. Cables intended to have limited circuit integrity in a fire are not covered by this specification, but they are however under consideration for future editions. There may be occasions when cables are required to have higher operating temperature ratings than those provided by using materials specified by the EN 50290 series. Suitable alternative materials are under consideration. 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. Publication
Year
Title
EN 10218-1
-
Steel wire and wire products – General – Part 1: Test methods
EN 10244-2
-
Steel wire and wire products – Non-ferrous metallic coatings on steel wire – Part 2: Zinc or zinc alloy coatings
EN 10257-1
-
Zinc or zinc alloy coated non-alloy steel wire for armouring either power cables or telecommunications cables – Part 1: Land cables
EN 50289
Series
Communication cables - Specifications for test methods
EN 50290
Series
Communication cables
EN 50307
-
Lead and lead alloy sheath and sleeves of electric cables
EN 50288-7:2005
-6-
EN 60708
-
Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath (IEC 60708)
EN 60811-1-1
-
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 (IEC 60811-1-1)
HD 383 S2
-
Conductors of insulated cables First supplement: Guide to the dimensional limits of circular conductors (IEC 60228 + IEC 60228A, mod.)
HD 446.3 S1
-
Thermocouples - Part 3: Extension and compensating cables – tolerances and identification system (IEC 60584-3, mod.)
IEC 60189-2
-
Low-frequency cables and wires with PVC insulation and PVC sheath - Part 2: Cables in pairs, triples, quads and quintuples for inside installations
3
Definitions, symbols and abbreviations
For the purposes of this European Standard the definitions of EN 50288-1 apply in addition to the following: 3.1 foil a metal tape laminated to a plastic tape 4
Cable construction
4.1
Conductor
Except for thermocouple extension and compensating cables, with conductors as described in Annex D, conductors shall be solid, stranded or flexible plain or metal coated copper in accordance with Class 1, 2 or 5 of HD 383 in the range of 0,5 mm² to 2,5 mm². For multi-core cables the maximum conductor resistance shall be as HD 383, and for finished multi-pair, multitriple and multi-quad cables the maximum resistance of HD 383 shall be increased by 2 %. Conductor joints shall be as EN 50288-1. Stranded and flexible conductors shall consist of wires circular in cross section assembled, without insulation between them, by concentric stranding or by bunching. When the installed length of cable results in a high conductor resistance, larger conductor sizes can be used.
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4.2
EN 50288-7:2005
Insulation
The insulating material shall be selected from those listed below. It shall be applied to comply with the requirements of EN 50288-1. a)
PVC
EN 50290-2-21
b)
Polyethylene
EN 50290-2-23
c)
Polypropylene
EN 50290-2-25
d)
Halogen free flame retardant compound
EN 50290-2-26
e)
Cross-linked polyethylen
EN 50290-2-29
The minimum thickness at any point of the insulation shall not be less than the value given in Table 1, for the specified voltage rating, and the concentricity shall not fall below 75 % when measured using the procedure in Annex A. There may be occasions when cables are required to have higher operating temperature ratings than those provided by using materials specified by the EN 50290 series. Suitable alternative materials are under consideration. Table 1 – Minimum insulation thickness Conductor size mm
Minimum thickness
2
mm Voltage rating
4.3
90 V
300 V
500 V
0,5
0,20
0,26
0,44
0,75
0,20
0,26
0,44
1,0
0,26
0,26
0,44
1,5
0,30
0,35
0,44
2,5
-
-
0,53
Cable elements
Cable elements shall be in accordance with 4.3 of EN 50288-1. The lay length of a pair, triple or quad shall not exceed 100 mm for cables with conductor crosssection ≤ 1,5 mm², nor 150 mm for cables with conductor cross-section 2,5 mm².
EN 50288-7:2005
4.4
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Identification of cabling elements
Unless otherwise specified e.g. by means of numbered cores or tapes, the coding for identification shall be as given in IEC 60189-2 or EN 60708, as appropriate. The colours shall meet the requirements of 4.4 of EN 50288-1. Coloured or numbered non-hygroscopic binder tapes may be applied over screened cabling elements as identification. 4.5
Screening of cabling elements
When screening of individual cable elements is specified, it shall be selected from those listed below and applied in accordance with 4.5 of EN 50288-1: a)
a plain or coated metal braid with a minimum filling factor of 0,6 when calculated in accordance with Annex B;
b)
a combination of a foil, and a plain or coated metal braid with a minimum filling factor of 0,3 when calculated in accordance with Annex B. The use of a drain wire is optional when this type of screen is applied;
c)
a foil applied with a minimum overlap of 20 % and with a drain wire in direct contact with the metallic side of the foil.
Metal braid wire diameters are given in Table B.1. 4.6
Cable make-up
The cable elements shall be assembled together in concentric layers or in unit construction to form the cable core. The cable core assembly shall be protected by wrappings of non-hygroscopic tape. Successive layers may be separated from each other by interlayer binders of non-hygroscopic tape. 4.7
Filling compound
When a filling compound is specified, it shall be selected from the compounds given in EN 50290-2-28 and shall meet the requirements of 4.7 of EN 50288-1. 4.8
Interstitial fillers
When fillers are used they shall meet the requirements of 4.8 of EN 50288-1. 4.9
Screening of the cable core
The cable core shall be protected with a protective layer as described in 4.11 or 4.13 when it is covered with a screen.
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EN 50288-7:2005
When screening of the cable core is specified, it shall be selected from those listed below, and applied in accordance with 4.9 of EN 50288-1: a)
a plain or coated metal braid with a minimum filling factor of 0,6 when calculated in accordance with Annex B;
b)
a combination of a foil, and a plain or coated metal braid with a minimum filling factor of 0,3 when calculated in accordance with Annex B. The use of a drain wire is optional when this type of screen is applied;
c)
a foil applied with a minimum overlap of 20 % and with a drain wire in direct contact with the metallic side of the foil.
Metal braid wire diameters are given in Table B.1. Screening over the cable core may also be in the form of a laminated sheath (moisture barrier as 4.10 or multi layer sheath as 4.18.2). 4.10
Moisture barriers
When a moisture barrier is specified it shall be selected from those listed below. It shall be applied to meet the requirements of 4.10 of EN 50288-1: a)
water swellable tapes;
b)
water swellable non-toxic powder;
c)
filling compound;
d)
laminated sheath, consisting of a longitudinal overlapped metallic foil, bonded within the overlapping and to the inner surface of an extruded sheath. The foil shall be one or both sides plastic coated, but in the case of only one side being coated a tinned copper drain wire shall be applied in direct contact with the metallic surface of the foil. The thickness of the metallic part of the foil shall be at least 0,15 mm;
e)
combinations of these four methods.
4.11
Protective wrappings
A wrapping layer may be applied under a sheath. A wrapping layer may be applied under a metallic protection layer. The wrapping layer shall be of a material compatible with the cable components with which it is in contact.
EN 50288-7:2005
4.12
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Inner sheath
When an additional inner sheath is applied under a metallic sheath (4.14) and may be applied under a lead sheath (4.18), it shall be selected from the materials listed below. It shall comply with the requirements of EN 50288-1: a)
PVC to EN 50290-2-22;
b)
Polyethylene to EN 50290-2-24;
c)
Halogen free flame retardant compound to EN 50290-2-27.
The nominal thickness shall be calculated in accordance with Table C.1. The nominal thickness (ISRt) shall be calculated like the nominal thickness (SRt) of the outer sheath without metallic protection (4.16). A halogen free sheathing compound shall be used where the cores are insulated with a halogen-free compound. There may be occasions when cables are required to have higher operating temperature ratings than those provided by using materials specified by the EN 50290 series. Suitable alternative materials are under consideration. 4.13
Bedding layers
A bedding layer shall be applied between a lead sheath and a metallic protection. This layer may be extruded (materials as in 4.12) or comprise helically applied tape or tapes. The bedding layer shall be extruded when gland diameter requirements are specified. The nominal thickness shall be calculated in accordance with Table C.5, where D is the diameter under the bedding layer calculated in accordance with Table C.1. There may be occasions when cables are required to have higher operating temperature ratings than those provided by using materials specified by the EN 50290 series. Suitable alternative materials are under consideration. 4.14
Metallic protection
Metallic protection, when specified, shall be in accordance with 4.14 of EN 50288-1. When round or flat galvanised steel wires are used, the minimum thickness shall be 0,80 mm (see Annex C). Flat galvanised steel wire may only be applied to cables where the diameter under the armour, calculated in accordance with Annex C, is > 15 mm. The round steel wires of single wire armour shall comply with the requirements of EN 10257-1 and EN 10218-1. The coating of the wires shall comply with the requirements of EN 10244-2. When a single or double layer of steel or brass tapes is used, the minimum thickness of tape shall be 0,20 mm for steel and 0,075 mm for brass.
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EN 50288-7:2005
When a metal braid is specified the minimum wire diameter shall be 0,30 mm. The minimum filling factor shall be 0,57 when calculated as Annex B. Metal braid wire diameters are given in Annex C. 4.15
Integral suspension strand
Not applicable. 4.16
Outer sheathing
The outer sheathing material shall be appropriate to the operating environment and may be selected from the materials listed below. It shall be applied in accordance with 4.16 of EN 50288-1: a)
PVC to EN 50290-2-22;
b)
Polyethylene to EN 50290-2-24;
c)
Halogen free flame retardant compound to EN 50290-2-27.
The nominal thickness (SRt) shall be calculated in accordance with the following formulae: a)
without metallic protection SRt = 0,04 x D + 0,7 mm (min 0,8 mm)
b)
with metallic protection
SRt = 0,028 x D + 1,1 mm (min 1,3 mm)
where D is the diameter under the outer sheath calculated in accordance with Table C.1. For cables without metallic protection, the minimum thickness at a point shall not fall below the nominal value by more than 15 % + 0,1 mm. The minimum average thickness, rounded to 0,1 mm, shall not be less than nominal thickness. For cables with metallic protection (4.14), the minimum thickness at any point shall not fall below the nominal value by more than 20 % + 0,2 mm 4.17
Fauna protection
When fauna protection is required, the method used shall be chosen from those in 4.17 of EN 50288-1. There are no dimensional requirements. 4.18
Chemical and /or environmental protection
When chemical or environmental protection is required, one of the following methods shall be used.
EN 50288-7:2005
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4.18.1 Lead sheath The lead sheath shall comply with EN 50307. The nominal thickness (LRt) of the lead or lead alloy sheath shall be calculated using the following formula:LRt = 0,03 x D + 0,7 mm (min of 0,8 mm) where D is the diameter under the lead sheath, calculated in accordance with Table C.1. The minimum thickness at any point shall not be less than 0,95 LRt – 0,1 mm. 4.18.2 Multi layer sheath The multi layer sheaths shall comprise a laminated sheath (see 4.10d) and an additional layer of polyamide. The laminated sheath sheath shall consist of a logitudinal overlapped aluminium foil with an extruded layer of high density polyethylene according to EN 50290-2-24. The thickness of the polyethylene layer shall be calculated as in 4.12 with a minimum thickness of 1,0 mm. The thickness of the aluminium foil shall be at least 0,15 mm without coating. The coating may be on one or both sides. The thickness of the polyamide covering shall be at least 0,3 mm at any point irrespective of cable diameter. NOTE A material specification for polyamide is under consideration.
5
Test methods and requirements for completed cables
The following tables give the tests to be applied, together with the respective limits, in order to demonstrate compliance with this specification.
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5.1
EN 50288-7:2005
Electrical tests
5.1.1
Low-frequency and d.c. electrical measurements
EN 50288-1 Clause No.
Parameter
Test method
5.1.1.1
Conductor resistance
EN 50289-1-2
5.1.1.2
Conductor resistance unbalance
EN 50289-1-2
N/A
5.1.1.3
Dielectric strength
EN 50289-1-3
Duration 1 minute.
5.1.1.4
Insulation resistance
EN 50289-1-4
5.1.1.5
Mutual capacitance
EN 50289-1-5
5.1.1.6
Capacitance Unbalance
EN 50289-1-5
Requirement HD 383 for multicore cables and maximum shall be increased by 2 % for multi-pair, multitriple, and multi-quad cables.
For 90 V rating
≥ 0,75 kVac or ≥ 1,5 kVdc
For 300 V rating
≥ 1,0 kVac or ≥ 2,0 kVdc
For 500 V rating
≥ 2,0 kVac or ≥ 3,0 kVdc
Material
Resistance MΩ/km
PVC
10
Polyethylene
1 000
Polypropolene
1 000
HFFR
10
XPLE
1 000
Polyolefin Others Polyolefin
< 150 nf/km < 250 nf/km 500 pf/500 m
(pairs/quads)
5.2
5.1.1.7
Inductance
EN 50289-1-12
Only to be used for L/R
5.1.1.8
Inductance to resistance ratio (L/R)
EN 50289-1-12 EN 50289-1- 2
< 25 µH/Ω for up to 1 mm 2 < 40 µH/Ω for 1,5 mm 2 < 60 µH/Ω for 2,5 mm
2
Mechanical tests EN 50288-1 Clause No
Parameter
Test method
Requirement
5.2.1
Conductor elongation at break
EN 50289-3-2
> 10 %
5.2.2
Shrinkage of insulation
EN 50289-3-4
EN 50288-1
5.2.3
Crush resistance of the cable
EN 50289-3-5
N/A
5.2.4
Impact resistance of the cable
EN 50289-3-6
N/A
5.2.5
Abrasion resistance of the sheath marking
EN 50289-3-8
N/A
5.2.6
Simulated installation testing of the cable
EN 50289-3-7
N/A
5.2.7
Tensile performance of the cable
EN 50289-3-16
N/A
EN 50288-7:2005
5.3
- 14 -
Environmental tests
For further study (ffs). 5.4
Fire performance test methods
Fire performance test methods shall be in accordance with 5.4 of EN 50288-1.
- 15 -
EN 50288-7:2005
Annex A (normative) Insulation or sheath thickness and concentricity Selection of samples and evaluation of results
A.1
Procedure for the measurement of thickness
The thickness of an insulation or sheath shall be measured in accordance with 8.1 and 8.5 of EN 60811-1-1. Three samples shall be taken from the cable at locations separated from each other by a distance of at least 1 m. Compliance shall be checked on 10 % of all cores of a cable with at least at a minimum all cores of one cabling element. If withdrawal of the conductor is difficult, it shall be stretched in a tensile machine or the sample shall be loosened by stretching or some other suitable means that does not damage the insulation. A.2
Evaluation of results
The mean of the thickness of an insulation or sheath is the mean of six measurements from each sample expressed in mm. Measurements and calculations shall be to three decimal places and the result rounded to two decimal places. When the third decimal number is 5 or more, the result is rounded up and when it is 4 or less, the result is rounded down. The minimum thickness of insulation at any point is the lowest value of all measurements. A.3
Internal concentricity
The internal concentricity is the ratio of the smallest measured thickness to the largest measured thickness.
EN 50288-7:2005
- 16 -
Annex B (normative) Copper braid screening
The screening braid shall consist of tinned, annealed, high conductivity copper wires. The number of spindles, ends per spindle and the diameter of the braid wires shall be sufficient to ensure that the filling factor (F) is not less than that specified. The filling factor shall be calculated from the following formula:
mnd w π 2 D 2 1+ 2 F= 2πD L
1/ 2
where F
is the filling factor
D
is the mean diameter under the braid (mm)
dw is the diameter of the braid wire (mm) L
is the lay length of the application of the braid (mm)
m is the total number of spindles n
is the total number of ends per spindle 2
Optical coverage (expressed as a percentage) = ( 2F – F ) % Preferred braid wire diameters are shown in Table B.1. The diameter of the wire shall be checked using a micrometer. Table B.1 – Braid wire diameter Mean diameter under the braid
Nominal diameter of braid wire
Minimum diameter of braid wire
Above
Up to and including
mm
mm
mm
mm
-
3
0,10
0,098
3
6
0,15
0,146
6
15
0,20
0,196
15
25
0,30
0,296
25
-
0,40
0,396
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EN 50288-7:2005
Annex C (normative) Determination of cable dimensions
C.1
Determination of cable dimensions
Starting with the conductor diameter and following the steps listed in Table C.1, the fictitious diameter FD is increased progressively. Steps not applicable to a particular cable construction will give a zero increase in fictitious diameter. Table C.1 – Steps to determine fictitious cable diameter Step
Construction feature
Symbol
Determination
FCD
Table C.2
1
Conductor diameter
2
Insulation radial thickness
IRt
Subclause 4.2 Table 1
3
Core element diameter
FC
FCD + (2 x IRt)
4
Pair element diameter
FP
2 x FC
5
Triple element diameter
FT
2,16 x FC
6
Quad element diameter
FQ
2,42 x FC
7
Screened element diamenter
2) FS
8
Additional separator tape (more than one screened element only)
FESM
FES + 0,1
9
Lay-up factors
LF
Table C.3
10
Crush factors (more than one element only)
CF
Table C.4
4) FA
FE
3)
+ 0,3
11
Cable make-up diameter
12
Tape over lay-up
FT
FA + 0,4
13
Overall screen
FOS
FT + 0,1
14
Inner sheath thickness under lead sheath or metallic protection
ISRt
Subclause 4.12
15
Diameter over inner sheath
FIS
FUIS + 2 x ISRt)
16
Lead sheath radial thickness
LRt
Subclause 4.18.1
17
Diameter over lead sheath
FL
18
Bedding radial thickness
BRt
Table C.5
19
Diameter over bedding
FB
FL + 2 x BRt
20
Armour size
AW
(thickness or diameter) Round or flat wire Tape Braid
FCE
1)
x LF x CF
5)
FUL
6)
+ 2 x LRt
Subclause 4.14 and Table C.6 Table C.7 Table C.8 7)
8)
21
Diameter over armour
FZ
FUZ
+K
x AW
22
Outer sheath radial thickness
SRt
Subclause 4.16
23
Outer sheath diameter
FD
Add (2 x SRt)
EN 50288-7:2005
- 18 -
Notes: 1)
FE:
Diameter of unscreened elements: FC, FP, FT or FQ
2)
FES:
Diameter of screened elements: FCS, FPS, FTS or FQS
3)
FCE:
Diameter of cabling elements: FE or FESM
4)
FA:
For cabling element Core: FA = FCE x LF (Crush factor has not to be applied)
5)
FUIS:
Diameter under inner sheath = FT or FOS
6)
FUL:
FT or FOS or FIS
7)
FUZ:
Diameter under armour = FIS or FB
8)
K:
=2
for flat or round wire armour
=4
for double tape armour
=4
for braid armour
C.2
Conductor diameters Table C.2 – Conductor diameters Conductor cross section
Conductor diameter
2
mm
0,50
0,80
0,75
1,00
1,00
1,10
1,50
1,40
2,50
1,80
mm
- 19 -
C.3
EN 50288-7:2005
Lay-up factors Table C.3 – Lay up factors
C.4
No.
Fact
No.
Fact
No.
Fact
No.
Fact
No.
Fact
1
1,00
21
5,33
41
7,67
61
9,00
81
10,42
2
2,00
22
5,67
42
7,67
62
9,00
82
10,42
3
2,16
23
5,67
43
7,67
63
9,35
83
10,60
4
2,42
24
6,00
44
8,00
64
9,35
84
10,70
5
2,70
25
6,00
45
8,00
65
9,35
85
10,70
6
3,00
26
6,00
46
8,00
66
9,35
86
10,70
7
3,00
27
6,15
47
8,00
67
10,00
87
10,70
8
3,45
28
6,41
48
8,15
68
10,00
88
11,00
9
3,80
29
6,41
49
8,35
69
10,00
89
11,00
10
4,00
30
6,41
50
8,35
70
10,00
90
11,00
11
4,00
31
6,70
51
8,41
71
10,00
91
11,00
12
4,16
32
6,70
52
8,41
72
10,00
92
11,00
13
4,41
33
6,70
53
8,41
73
10,16
93
11,00
14
4,41
34
7,00
54
8,60
74
10,16
94
11,35
15
4,70
35
7,00
55
8,70
75
10,16
95
11,35
16
4,70
36
7,00
56
8,70
76
10,16
96
11,35
17
5,00
37
7,00
57
8,70
77
10,35
97
11,35
18
5,00
38
7,33
58
9,00
78
10,42
98
12,00
19
5,00
39
7,33
59
9,00
79
10,42
99
12,00
20
5,33
40
7,33
60
9,00
80
10,42
100
12,00
Crush factors Table C.4 – Crush factors Cable component
Crush factor
Ind screen pairs
0,889
Un/Col screen pairs
0,820
Ind screen triples
0,939
Un/Col screen triples
0,865
Cores/Quads
1,000
EN 50288-7:2005
C.5
- 20 -
Bedding radial thickness Table C.5 – Bedding radial thickness Diameter under bedding
C.6
Bedding thickness
Above
Up to and including
mm
mm
mm
-
25
1,0
25
35
1,2
35
45
1,4
45
60
1,6
60
80
1,8
80
-
2,0
Round wire armour Table C.6 – Round armour wire Diameter under armour
C.7
Wire diameter
Above
Up to and including
mm
mm
mm
0
15
0,9 ± 0,035
15
25
1,25 ± 0,040
25
35
1,6 ± 0,045
35
45
2,0 ± 0,050
45
60
2,5 ± 0,060
60
-
3,15 ± 0,070
Tape armour Table C.7 – Tape armour Diameter under armour
Tape thickness
Above
Up to and including
mm
mm
mm
-
30
0,2
30
70
0,5
70
-
0,8
- 21 -
C.8
EN 50288-7:2005
Braid armour Table C.8 – Braid armour wire size Diameter under armour
Wire diameter
Above
Up to and including
mm
mm
mm
-
20
0,3
20
-
0,4
EN 50288-7:2005
- 22 -
Annex D (informative) Thermocouple extension and compensating conductor combinations
D.1
Extension cables Table D.1 – Extension cables
D.2
Combination code
Positive
Negative
Nominal e.m.f.
KX
Nickel chromium
Nickel aluminium
4,10
NX
Nickel chromium silicon
Nickel silicon
2,77
EX
Nickel chromium
Copper nickel (constantan)
6,32
JX
Iron
Copper nickel (constantan)
5,27
TX
Copper
Copper nickel (constantan)
4,28
(microvolts o o 0 C/100 C)
Compensating cables Table D.2 – Compensating cables Combination code
Positive
Negative
Nominal e.m.f.
KCA
Iron
Copper nickel alloy
4,10
KCB
Copper
Copper nickel (constantan)
4,10
RCA
Copper
Copper low nickel alloy
0,65
RCB
Copper
Copper nickel mo alloy
0,65
SCA
Copper
Copper low nickel alloy
0,65
SCB
Copper
Copper nickel mo alloy
0,65
BC
Copper
Copper
0,03
NC
Copper nickel mg
Copper nickel mg
2,77
(microvolts o o 0 C/100 C)
- 23 -
D.3
EN 50288-7:2005
E.M.F.
The tolerance on e.m.f. values for the metal combinations used shall be in accordance with HD 446.3 S1. D.4
Colour codes
The insulation colour code used shall be in accordance with HD 446.3 S1, or as agreed between the customer and supplier.
BS EN 50288-7:2005
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