SIST HD 627 S1:1998/A2:2006
(Amendment)Multicore and multipair cables for installation above and below ground
Multicore and multipair cables for installation above and below ground
Applies to multicore and multipair rigid and flexible conductor cables for fixed installations having a rated voltage up to 1 kV and operating at a voltage above 80 V rms. The insulation and sheath may be either thermoplastic or thermosetting, halogenated or halogen free.
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Câbles multiconducteurs et multipaires pour installation dans l'air et dans le sol
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General Information
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HARMONIZATION DOCUMENT HD 627 S1/A2
DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT November 2005
ICS 29.060.20
English version
Multicore and multipair cables
for installation above and below ground
Câbles multiconducteurs et multipaires Vieladrige und vielpaarige Kabel für die
pour installation dans l'air et dans le sol Verlegung in Luft und in Erde
This amendment A2 modifies the Harmonization Document HD 627 S1:1996; it was approved by
CENELEC on 2005-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal
Regulations which stipulate the conditions for implementation of this amendment on a national level.
Up-to-date lists and bibliographical references concerning such national implementation may be obtained on
application to the Central Secretariat or to any CENELEC member.
This amendment exists in one official version (English).
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. HD 627 S1:1996/A2:2005 E
Page 0-2
Foreword
This amendment to the Harmonization Document HD 627 S1:1996 was prepared by WG 9 of the
Technical Committee CENELEC TC 20, Electric cables. CENELEC TC 20 confirmed at its Setubal
meeting (June 2004) that the amendment should go to the Unique Acceptance Procedure.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as amendment A2 to HD 627 S1:1996 on 2005-06-01.
A list of additions and amendments to the particular sections of Parts 3-7 is given in this Part 0.
Users of HD 627 should note that, in the particular sections, cross-references have only been updated
where the complete section has been re-issued. This Part 0 of HD 627 contains a list of relevant changes
to cross-references, which should be consulted in conjunction with the particular section. National
standards implementing one or more particular sections of HD 627 may update cross-references in
advance of changes to the published version of the HD.
By decision of the Technical Board (D81/139 extended by D104/118 & D114/076) this HD exists only in
English.
The following dates were fixed:
– latest date by which the existence of the amendment
has to be announced at national level (doa) 2005-12-01
– latest date by which the amendment has to be implemented
at national level by publication of a harmonized
national standard or by endorsement (dop) 2006-06-01
– latest date by which the national standards conflicting
with the HD have to be withdrawn (dow) 2008-06-01
Page 0-3
CONTENTS
PART 1 General requirements
PART 2 Special test methods
PART 3 Multicore and multipair cables for use underground
(5)
3-A1 : Multicore cable with copper conductors, single wire armoured and PVC sheathed
(5)
3-A2 : Multipair cable with copper conductors, single wire armoured and PVC sheathed
3-E: 450/750 V multicore cable with polyethylene insulation and sheath
3-F1: 300 V armoured XLPE insulated and PVC sheathed, screened instrumentation
cables
3-F2: 250 V armoured PVC insulated and PVC sheathed single and multipair screened
signalling cables
3-F3: 1 kV armoured multicore XLPE insulated and PVC sheathed cables
(3)
3-K : Multipair and multiquad cables with copper conductors, solid or cellular polyethylene
insulated, with or without longitudinal and/or radial watertightness with armour and
polyvinyl chloride or polyethylene sheathed.
PART 4 Multicore and multipair halogenated cables complying with HD 405.1
4-B1: 500 V multiquad cables with and without a metallic covering
4-B2: 750 V multicore cables with and without a metallic covering
(5)
4-C1 : 300/500 V Cables with solid or stranded conductors and with or without a common
screen
(5)
4-C2 : Screened cables with stranded conductors and rated voltage 150/250 V
(5)
4-D1 : 450/750 V multicore PVC insulated and sheathed cables
(5)
4-D2 : 450/750 V multicore PVC insulated and sheathed cables with concentric conductor
(4)
4-D3 : 450/750 V multicore PVC insulated and sheathed flexible cables
(4)
4-D4 : 450/750 V multicore PVC insulated and sheathed screened and armoured cables
4-E1: 450/750 V multicore cable with a metallic covering
4-E2: Multipair cables with a metallic covering
4-E3: 450/750 V multicore cable with a lead screen
4-F: 300 V armoured and unarmoured XLPE insulated and PVC sheathed, screened
instrumentation cables
(2)
4-H : 0,6/1 kV PVC or XLPE insulated multicore cables with or without concentric
conductor. (Replaces 4-H1 and 4-H2)
(1)
4-J1 : PVC insulated and sheathed multicore and multipair cables
(1)
4-J2 : 0,6/1 kV multicore cables with a metallic screen
(6)
4-N : Multicore cables with PVC-insulation with and without concentric conductor or
screen or armouring for rated voltages 0,6/1 kV
PART 5 Multicore and multipair halogenated cables complying with HD 405.3 or similar
5-A1: Multicore cables with copper conductors, single wire armoured and PVC sheathed
(5)
5-A2 : Multipair cables with copper conductors, single wire and double steel tape armoured
and PVC sheathed
5-F1: 1 kV XLPE insulated and PVC sheathed multicore cables
5-F2: 250 V PVC insulated and PVC sheathed multicore, single and multipair signalling
cables
5-F3: 500 V screened and unscreened PVC insulated and PVC sheathed multicore
control cables
5-F4: 300 V armoured and unarmoured XLPE insulated and PVC sheathed, screened
instrumentation cables.
5-G1: Cables in pairs, triples and quads with copper conductors, PVC insulated and
sheathed and metallic screen
5-G2: Cables in pairs, triples and quads with copper conductors, EPR insulation, CSP
sheaths and metallic screen
Page 0-4
5-M: PVC insulated and sheathed multicore cables and PVC or polyethylene insulated
and PVC sheathed multipair cables
PART 6 Multicore and multipair halogen-free cables complying with HD 405.1
6-E: 450/750 V multicore cables with common screen
PART 7 Multicore and multipair halogen-free cables complying with HD 405.3 or similar
7-A1: Multicore cables with copper conductors, single wire armoured and unarmoured with
non-halogenated sheath
(5)
7-A2 : Multipair cables with copper conductors single wire and double steel tape armoured
with non-halogenated sheath
7-B1: 500 V multiquad cables with a metallic covering
7-B2: 750 V multicore cables with a metallic covering
7-D1: 450/750 V multicore cables without screen
7-D2: 450/750 V multicore cables with concentric conductor
7-F1: 1 kV XLPE insulated and non-halogenated sheathed multicore cables
7-F2: 300 V armoured and unarmoured XLPE insulated and non-halogenated sheathed
and screened instrumentation cables
7-G: Cables in pairs, triples and quads with copper conductors, metallic screen and
having halogen free all-non-metallic components
(2)
7-H : 0,6/1 kV XLPE insulated multicore cables with or without concentric conductor
7-K: 150 V multicore and multipair cables with and without a metallic covering
7-L1: Cables in pairs and triples and multicore cables with circular copper conductors and
metallic covering
7-L2: Multipair and multicore cables with circular copper conductors for plug-in
connections
7-M: EPR or XLPE insulated and ZH sheathed multicore cables and polyethylene
insulated and ZH sheathed multipair cables
(6)
7-N : Halogen free, multicore cables with and without concentric conductor or
screen for rated voltages 0,6/1 kV
(1)
NOTES Amendment No.1 introduces some changes to the text
(2)
Amendment No.1 completely revises the particular sSection
(3)
New section introduced by Amendment No. 1
(4)
Amendment No. 2 withdraws the particular section
(5)
Amendment No. 2 completely revises the particular section
(6)
New section introduced by Amendment No.2
Page 0-5
List of updated cross-references
Original Ref. Original title New Ref. New title
HD 186 Marking by inscription for the identification of EN 50334 Marking by inscription for the identification of cores of
cores of electric cables having more than 5 electric cables
cores
HD 383 Conductors of electric cables EN 60228 Conductors of electric cables
HD 405.1 Tests on electric cables under fire conditions EN 60332-1-2 Tests on electric and optical fibre cables under fire
Part 1: Test on a single vertical insulated wire or conditions - Part 1-2: Test for vertical flame propagation
cable for a single insulated wire or cable – Procedure for 1 kW
pre-mixed flame
HD 405.3 Tests on electric cables under fire conditions EN 50266 Series Common test methods for cables under fire conditions –
Part 3: Tests on bunched wires or cables Test for vertical flame spread of vertically-mounted
bunched wires or cables
HD 505 Series Common test methods for insulating and EN 60811 Series Insulating and sheathing materials of electric cables –
sheathing materials of electric cables Common test methods
HD 602 Test on gases evolved during combustion of EN 50267-2-2 Common test methods for cables under fire conditions –
materials from cables – Determination of degree Test on gases evolved during combustion of materials
of acidity (corrosivity) of gases by measuring pH from cables
and conductivity Part 2-2: Procedures – Determination of degree of
acidity of gases for materials by measuring pH and
conductivity
HD 606 Series Measurement of smoke density of electric cables EN 50268 Series Common test methods for cables under fire conditions –
burning under defined conditions Measurement of smoke density of cables burning under
defined conditions
EN 50265-2-1 Common test methods for cables under fire EN 60332-1-2 Tests on electric and optical fibre cables under fire
conditions – Test for resistance to vertical flame conditions - Part 1-2: Test for vertical flame propagation
propagation for a single insulated conductor or for a single insulated wire or cable – Procedure for 1 kW
cable pre-mixed flame
Part 2-1: Procedures – 1 kW pre-mixed flame
IEC 60502 Extruded solid dielectric insulated power cables IEC 60502-1 Power cables with extruded insulation and their
for rated voltages from 1 kV to 30 kV accessories for rated voltages from 1 kV (U = 1,2 kV)
m
up to 30 kV (U = 36 kV)
m
Part 1: Cables for rated voltages of 1 kV (U = 1,2 kV)
m
and 3 kV (U = 3,6 kV)
m
IEC 60754-1 Test on gases evolved during combustion of EN 50267-2-1 Common test methods for cables under fire conditions –
electric cables Part 1: determination of the Tests on gases evolved during combustion of materials
amount of halogen acid gas evolved during the from cables – Part 2-1: Procedures – Determination of
combustion of polymeric materials taken from the amount of halogen acid gas
cables
Page 1-0
Part 1
PART 1:
GENERAL REQUIREMENTS
Replace the complete part by the following.
Page 1-1
Part 1
MULTICORE AND MULTIPAIR CABLE FOR INSTALLATION ABOVE AND BELOW GROUND
PART 1: GENERAL REQUIREMENTS
Page 1-2
Part 1
CONTENTS
Page
1 General.4
1.1 Scope.4
1.2 Object.4
2 Definitions.4
2.1 Definitions relating to insulating and sheathing compounds .4
2.2 Definitions relating to the tests.5
2.3 Rated voltage.6
3 Marking.6
3.1 Indication of origin .6
3.2 Additional marking.7
3.3 Durability.7
3.4 Legibility.7
3.5 Common marking.7
3.6 Use of the name CENELEC .7
4 Core identification .7
5 General requirements for the construction of the cables.7
5.1 Conductors.7
5.2 Insulation.8
5.3 Fillers and tapes.9
5.4 Assembly of cores, pairs, triples or quads.9
5.5 Inner covering (bedding) .9
5.6 Rip cord.9
5.7 Inner sheath. 10
5.8 Metallic coverings. 10
5.9 Oversheath. 10
5.10 Non metallic components of halogen free cables . 11
6 Completed cables . 11
7 (Spare). 11
8 (Spare). 11
9 Guide to use and selection of cable . 11
Page 1-3
Part 1
REFERENCES
Part 1 of HD 627 S1 incorporates by dated or undated reference, provisions from other publications. These
references are cited at the appropriate places in the text and the publications are listed hereafter. For dated
references, subsequent amendments to or revisions of any of these publications apply to Part 1 of HD 627 S1
only when incorporated in it by amendment or revision. For undated references the latest edition of the publication
referred to applies.
EN 50266 series Common test methods for cables under fire conditions – Test for vertical flame spread of
vertically-mounted bunched wires or cables
EN 50267 series Common test methods for cables under fire conditions - Tests on gases evolved during
combustion of materials from cables
EN 50268 series Common test methods for cables under fire conditions – Measurement of smoke density
of cables burning under defined conditions
EN 50334 Marking by inscription for the identification of cores of electric cables
EN 60228 Conductors of insulated cables
EN 60332-1 series Tests on electric and optical fibre cables under fire conditions – Part 1: Test for vertical
flame propagation for a single insulated wire or cable
EN 60811 series Insulating and sheathing materials of electric and optical cables – Common test methods
(IEC 60811 series)
HD 21 series Cables of rated voltages up to and including 450/750 V and having thermoplastic
insulation
HD 22 series Cables of rated voltages up to and including 450/750 V and having crosslinked insulation
HD 605 S1 Electric cables – Additional test methods
IEC 60189-1 Low frequency cables and wires with PVC insulation and PVC sheath – Part 1: General
test and measuring methods
Page 1-4
Part 1
MULTICORE AND MULTIPAIR CABLE FOR INSTALLATION
ABOVE AND BELOW GROUND
PART 1 – GENERAL REQUIREMENTS
1 General
1.1 Scope
HD 627 S1 applies to multicore and multipair rigid and flexible conductor cables for fixed installations having a
rated voltage up to 1 kV and operating at a voltage above 80 V rms. The insulation and sheath may be either
thermoplastic or thermosetting, halogenated or halogen free.
The cables are mainly intended for use in power generating plants and sub-stations and some for direct burial in
conjunction with utility operations. Cables may have specific fire performance requirements. Cables designed to
be installed within the containment area of nuclear power plants (LOCA cables), or cables specifically designed to
be radiation resistant are not included in this HD.
This Part 1 specifies the General requirements applicable to these cables; additional or deviating requirements
are given in the particular sections of this HD.
Test methods are given in EN 50266, EN 50267, EN 50268, EN 50334, EN 60228, EN 60332-1, EN 60811, HD
21, HD 22, HD 605 S1, IEC 60189 and this HD.
The particular types of cables for each category of fire performance are specified in Parts 3 to 7.
1.2 Object
The objects of this Harmonization Document are:
- to standardise cables that are safe and reliable when properly used, in relation to the technical requirements
of the system of which they form a part;
- to state the characteristics and manufacturing requirements directly or indirectly bearing on safety;
- to specify methods for checking conformity with those requirements.
2 Definitions
2.1 Definitions relating to insulating and sheathing compounds
2.1.1 Insulating and sheathing compounds
The types of insulating and sheathing compound covered in this HD are listed below together with their
abbreviated designations.
2.1.1.1 Thermoplastic polyvinyl chloride compound (PVC)
Combinations of materials suitably selected, proportioned and treated, of which the characteristic constituent is
polyvinyl chloride or one of its co-polymers. The same term also designates compounds containing both polyvinyl
chloride and certain of its co-polymers.
2.1.1.2 Cross-linked ethylene propylene rubber (EPR)
A compound based on ethylene propylene rubber or similar (EPM or EPDM) which when cross-linked complies with
the requirements given in the particular sections.
Page 1-5
Part 1
2.1.1.3 Cross-linked polyethylene (XLPE)
A thermosetting material formed by the cross-linking of thermoplastic polyethylene compound either by chemical or
irradiation methods so as to comply with the requirements given in the particular sections.
2.1.1.4 Ethylene copolymers
Thermoplastic or cross-linked materials in which the characteristic constituent is a copolymer of ethylene such as
EVA, EEA, EMA, compounded so as to comply with the requirements given in the particular sections.
2.1.1.5 Chlorinated synthetic elastomeric compound
A vulcanised compound in which the characteristic constituent is polychloroprene rubber (PCP) or other chlorinated
synthetic elastomer, such as CSP, CPE or NBR/PVC compounded so as to comply with the requirements given in
the particular sections.
NOTE The abbreviations PCP, CSP and CPE are those in common use. Equivalent codings according to ASTM are CR, CSM
and CM.
2.1.1.6 Aromatic based compound
A thermoplastic compound based on aromatic polymers e.g. polyphenylene oxide (PPO), polybutylene terephthalate
(PBT), polyetheretherketone (PEEK) which comply with the requirements given in the particular sections.
2.1.1.7 Polyethylene
A thermoplastic material compounded so as to comply with the requirements given in the particular sections.
2.1.2 Type of compound
The category in which a compound is placed according to its properties, is determined by specific tests. The type
designation is not directly related to the composition of the compound.
2.2 Definitions relating to the tests
NOTE Tests classified as Sample (S) or Routine (R) may be required as part of any Type Approval Schemes.
2.1.1 Type tests (Symbol T)
Tests required to be made before supplying a type of cable covered by this HD on a general commercial basis in
order to demonstrate satisfactory performance characteristics to meet the intended application. These tests are of
such a nature that, after they have been made, they need not be repeated unless changes are made in the cable
material, design or type of manufacturing process which might change the performance characteristics.
2.2.2 Sample tests (Symbol S)
Tests made on selected lengths of completed cable, on samples of completed cable, or components taken from a
completed cable adequate to verify that the finished product meets the design specifications.
2.2.3 Routine test (Symbol R)
Tests made on all production cable lengths to demonstrate their integrity.
Page 1-6
Part 1
2.3 Rated voltage
The rated voltage of a cable is the reference voltage for which the cable is designed, and shall be given in the
particular sections.
The rated voltage is expressed by the combination of the following values U /U expressed in kV or V.
o
U is the rms value between any insulated conductor and 'earth' (metal covering of the cable or the surrounding
o
medium); for example U = 0,6 kV.
o
U is the rms value between any two phase-conductors of a multicore cable or of a system of single-core cables; for
example U = 1,0 kV.
Where cables are installed underground in parallel with high voltage feeders for long lengths voltages may be
induced as a result of faults in the power circuits. Appropriate voltage tests may be specified to check the adequacy
of the insulation where such occurrences are likely.
3 Marking
3.1 Indication of origin
Cables shall be provided with an identification of origin consisting of either:
1. the manufacturer's identification thread, or
2. the continuous marking of the manufacturer's name or trademark, or (if legally protected) identification
number, by one of the three following methods:
(a) printed tape within the cable;
(b) printing in a contrasting colour on the insulation of at least one core;
(c) printing, indenting or embossing on the outer surface of the cable.
3.1.1 Continuity of marks
Unless otherwise specified in the particular section, each specified mark shall be regarded as continuous if the
distance between the end of the mark and the beginning of the next identical mark does not exceed:
550 mm if the marking is on the outer surface of the cable.
275 mm if the marking is:
(i) on the insulation of a sheathed cable;
(ii) on a tape within a sheathed cable
NOTE A 'Specified Mark' is any mandatory mark covered by this Part of the HD or by the particular requirements of Part 3
onwards of this HD.
The diagram below shows an example of the marking as used on the outer surface of the cable, where the word
'ORIGIN' is for the mandatory information required for 3.1, and 'XYZ' is one of any other mandatory marks.
Page 1-7
Part 1
3.2 Additional marking
Additional marking requirements may be specified in the particular sections.
3.3 Durability
Printed markings shall be durable. Compliance with this requirement shall be checked by the test given in Subclause
2.5.4 of HD 605 S1. The printed legend shall be legible after carrying out the test.
3.4 Legibility
All markings shall be legible. Printed markings shall be in contrasting colours.
All colours of the identification thread shall be easy to recognise or easily be made recognisable, if necessary, by
cleaning with a suitable solvent.
3.5 Common marking
Under consideration
3.6 Use of the name CENELEC
The name CENELEC, in full or abbreviated, shall not be directly marked on, or in, the cables.
4 Core identification
The cores shall be identified by colours or numbers when specified in the particular sections. Colouring shall be
achieved by the use of coloured insulation or by a coloured surface.
When identification is by numbers, they shall be printed in a colour which contrasts with the core colours. Marking
shall comply with EN 50334 unless otherwise specified.
Colours shall be clearly identifiable and durable. Durability shall be checked by the test given in Subclause 2.5.4 of
HD 605 S1.
Compliance with these requirements shall be verified by visual examination.
For paired, tripled and quadded cables the individual cores in each unit shall be identified.
When required by the particular section, each unit shall be identified.
Compliance with these requirements shall be verified by visual examination.
Detailed requirements for the identification scheme are given in the particular sections.
5 General requirements for the construction of cables
5.1 Conductors
5.1.1 Material
Conductors shall be either plain or metal-coated annealed copper.
5.1.2 Construction
The maximum diameters of the wires of flexible conductors, and the minimum number of the wires of rigid
conductors, shall be in accordance with EN 60228, unless otherwise specified in the particular sections.
Page 1-8
Part 1
The classes of the conductors relevant to the various types of cables are given in the particular sections.
Conductors shall be circular in shape, and solid metal, stranded or flexible.
5.1.3 Check of construction
Compliance with the requirements of Subclauses 5.1.1 and 5.1.2 including the requirements of EN 60228 shall be
checked by inspection and by measurement.
5.1.4 Electrical resistance
The resistance of each conductor at 20 °C shall be in accordance with the requirements of EN 60228 for the given
class of conductor unless otherwise specified in the particular sections.
Compliance shall be checked by the test given in Subclause 3.1.1 of HD 605 S1.
5.1.5 Separator tape
A separator tape may be placed between the conductor and insulation. Unless otherwise specified, it shall be non-
hygroscopic.
It shall be easily removable from the conductor.
5.2 Insulation
5.2.1 Material
The insulation shall be a compound as specified for each type of cable in the particular sections.
The test requirements and the reference to test methods are specified in the particular sections.
The maximum conductor temperature in normal operation may be stated in the particular sections where
appropriate.
5.2.2 Application to the conductor
The insulation may consist of one or more bonded layers.
It shall be so applied that it fits closely on the conductor or over the separator tape, and it shall be possible to remove
it without damage to the insulation itself, to the conductor or to the metal coating if any. If required, compliance shall
be checked by inspection and by manual test.
The insulation shall be applied by a suitable extrusion process, cross-linked where required, and shall form a
compact and homogenous body.
5.2.3 Thickness
Unless otherwise specified in the particular sections the following requirements shall apply.
The mean value of the thickness of insulation shall not be less than the specified value for each type and size of
cable shown in the tables of the particular sections.
However, the thickness at any one place may be less than the specified value provided that the difference does not
exceed 0,1 mm + 10 % of the specified value, unless otherwise stated in the particular sections.
Compliance shall be checked by the test given in Subclause 2.1.1 of HD 605 S1.
Page 1-9
Part 1
5.3 Fillers and tapes
For each type of cable, the particular sections detail whether that cable includes fillers or tapes or whether the sheath
or inner covering may penetrate between the cores, thus forming a filling.
Tapes may be applied as separators over the insulation of an individual core or as a binder over the core assembly.
5.3.1 Materials
The fillers and tapes, if any, shall be composed of a suitable material.
When fillers or binder tapes are employed there shall be no harmful interactions between their constituents and the
insulation and/or the sheath.
Compliance with this requirement shall be checked by the test given in the particular section.
5.3.2 Application
Where fillers are used these may be applied either separately or as part of the inner covering or the inner sheath to
form a compact and reasonably circular cable. It shall be possible to strip the fillers, if any, from the cable without
damaging the insulation of cores.
5.4 Assembly of cores, pairs, triples or quads
In multicore cables the direction and length of lay is at the discretion of the manufacturer, unless otherwise specified
in the particular section. In 'unit' type cables the length of lay within a unit shall be sufficiently short to avoid separation
of the elements. The length of lay of adjacent units shall be such as to meet any requirements for capacitance
unbalance.
5.5 Inner covering (bedding)
The inner covering, if any, may be extruded or lapped or a combination of the two.
5.5.1 Material
The material used for inner coverings shall be suitable for the operating temperature of the cable and compatible with
the cable components with which it is in contact.
Compliance with this requirement shall be checked by the tests given in the particular section.
5.5.2 Application
The extruded inner covering shall surround the core assembly completely and may penetrate the spaces between
them, giving the assembly a reasonably circular shape. The extruded inner covering shall be easily separable from
the cores.
Lapped beddings shall consist of one or more layers of tape covering the entire outer surface of the core assembly.
For each type of cable, the particular sections indicate whether that cable includes an extruded inner covering or a
lapped bedding or a combination of these.
5.5.3 Thickness
Unless otherwise stated in the particular sections no measurement is required for the extruded or lapped inner
covering.
5.6 Rip cord
This shall be provided when required in the particular section.
Page 1-10
Part 1
5.7 Inner sheath
An inner sheath may be specified in the particular sections.
5.7.1 Material
The material used for the inner sheath shall be suitable for the operating temperature of the cable and compatible
with the cable components with which it is in contact.
Test requirements and the reference to test methods are specified in the particular sections.
5.7.2 Application
The inner sheath shall be extruded in a single layer. The sheath may be applied over an inner covering or directly
over the core assembly. The sheath shall not adhere to the cores.
5.7.3 Thickness
The thickness of the extruded inner sheath shall be as specified in the particular sections.
5.8 Metallic coverings
5.8.1 Type of metallic layers
The following types of metallic layers may be specified in the particular sections:
(a) metallic screen
(b) concentric conductor
(c) metallic armour
(d) a combination of the above
Detailed constructions of metallic coverings, together with test methods and requirements, are specified in the
particular sections.
5.8.2 Application
The metallic layers may be applied over the core or unit assembly, an inner covering or inner sheath, as specified
in the particular sections.
5.8.3 Drain wire
Unless otherwise stated the drain wire shall be composed of tinned copper wire or wires in continuous contact
with the metal surface of the tape screen or braid. Dimensions of the drain wire(s) are given in the particular
sections.
5.9 Oversheath
5.9.1 Material
The oversheath shall be a compound suitable for the maximum conductor temperature in normal operation and of
the type specified for each type of cable in the particular sections.
The test requirements and the references to test methods for these compounds are specified in the particular
sections.
Page 1-11
Part 1
5.9.2 Application
The oversheath shall be extruded and may consist of one or more layers.
For unarmoured cables the sheath shall not adhere to the cores.
A separator, consisting of a film or tape, may be placed under the oversheath.
5.9.3 Thickness
Unless otherwise specified in the particular section the following requirements shall apply.
5.9.3.1 Sheath applied over smooth surface
For a sheath applied on a smooth cylindrical surface, such as an inner covering or metal sheath, the mean value
of the thickness of the oversheath shall not be less than the specified value for each type and size of cable shown
in the tables of the particular sections.
However, the thickness at any place may be less than the specified value provided that the difference does not
exceed 0,1 mm + 15 % of the specified value.
Test methods are specified in Subclause 2.1.2 of HD 605 S1.
5.9.3.2 Sheath applied over uneven surface
For a sheath applied on an irregular cylindrical surface, such as a penetrating sheath on an unarmoured cable
without inner covering or a sheath applied directly over armour, metallic screen or concentric conductor, the
smallest thickness at any point of the oversheath shall not fall below the value given in the appropriate table of the
particular section by more than 0,2 mm + 20 % of the specified value.
Test methods are given in Subclause 2.1.2 of HD 605 S1.
5.10 Non metallic components of halogen free cables
All non metallic components in Parts 6 and 7 of this HD shall be halogen free. This shall be checked by the test
specified in EN 50267-2-2 unless otherwise specified in the particular section.
6 Completed cables
All cables shall comply with the requirements given in the particular sections.
7 (Spare)
8 (Spare)
9 Guide to use and selection of cables
For guidance on the use of cables see particular sections of this HD.
When selecting cables, attention is drawn to the fact that national conditions or regulations covering, e.g. climatic
conditions or installation requirements, may exist. These should therefore be followed in conjunction with this HD.
Page 1-12
Part 1
BLANK PAGE
Page 3-A1-0
Part 3 Section A-1
SECTION A-1
MULTICORE CABLE WITH COPPER CONDUCTORS
SINGLE WIRE ARMOURED AND PVC SHEATHED
Replace the complete section by the following.
Page 3-A1-1
Part 3 Section A-1
SECTION A-1
MULTICORE CABLE WITH COPPER CONDUCTORS
SINGLE WIRE ARMOURED AND PVC SHEATHED
NOTE Section A of Part 3 of HD 627 S1 is divided into:
Section A-1: Multicore cable with copper conductors, single wire armoured and PVC sheathed
Section A-2: Multipair cable with copper conductors, single wire armoured and PVC sheathed
CONTENTS
Page
1 Scope.2
2 Additional general requirements .2
2.1 Identification of cores.2
2.2 Cable marking.2
2.3 Additional routine tests .3
2.4 Additional sample tests.4
2.5 Additional type tests.4
3 Cables without metallic covering.4
4 Cables with metallic covering.4
4.1 Code designation.4
4.2 Rated voltage.5
4.3 Construction.5
4.4 Tests .6
Tables 1-5 .7
Appendix - Guide to use.10
---------------------
REFERENCES
Section A-1 of Part 3 of HD 627 S1 incorporates by dated or undated reference, provisions from other publications.
These references are cited at the appropriate places in the text and the publications are listed hereafter. For dated
references, subsequent amendments to or revisions of any of these publications apply to Section A-1 of Part 3 of
HD 627 S1 only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
EN 60228 Conductors of insulated cables
EN 60811 series Insulating and sheathing materials of electric and optical cables - Common test methods
(IEC 60811 series)
HD 21 series Cables of rated voltages up to and including 450/750 V and having thermoplastic
insulation
HD 605 S1 Electric cables - Additional test methods
IEC 60183 Guide to the selection of high-voltage cables
Page 3-A1-2
Part 3 Section A-1
1 Scope
This section specifies requirements for and dimensions of multicore PVC insulated and PVC sheathed
cables. These cables are for use underground in wet conditions and also for withstanding high levels of
induced voltage.
This section covers:
Multicore cables (2 to 37 core) having copper conductors and steel wire armour.
2 Additional general requirements
The following general requirements shall be read in conjunction with those given in Part 1.
2.1 Identification of cores
The cores shall be black or white with printed numbers in a contrasting colour.
The cores shall be numbered in sequence from 1 to 37 as follows:
2 core - 1 & 2
3 core - 1, 2 & 3
4 core - 1, 2, 3 & 4
7 core - Centre numbered 1; 6 round numbered 2 to 7
12 core - Centre 3 cores numbered 1, 2 & 3; 9 cores around numbered 4 to 12
19 core - Centre as 7 above; 12 around numbered 8 to 19
27 core - Centres as 12 core above; 15 around numbered 13 to 27
37 core - Centres as 19 core; 18 around numbered 20 to 37
Cores shall be clearly identifiable and the printing durable.
Durability shall be checked by the test given in Subclause 2.5.4 of HD 605 S1.
2.2 Cable marking
The method of cable marking shall comply with Clause 3 of Part 1 and the following additional
requirements.
2.2.1 External marking
The external surface shall be legibly marked with the following elements of marking.
Element Example of marking
1. Electric cable ELECTRIC CABLE
2. Voltage 600/1 000 V AUX
3. Standard number HD 627 S1-3-A-1
4. Manufacturer's identification XYZ
The marking shall be by indenting or embossing consisting of upright block characteristics
with a minimum height of 3 mm.
Page 3-A1-3
Part 3 Section A-1
For cables with tabulated approximate overall diameters above 15 mm, Elements 1, 2 and 3
shall appear in any sequence that neither confuses nor conflicts, on two or more primary
lines along th
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