---

It shaJl be possible to separate the cores easily

The inner sheath shall be polyvinyl chloride compound of Type FVC/ST complying with the non-electrical requirements given in ТаЫа I. The sheath shaI be appGed around the inner covering or tape wrapping. It shall fit dosely but not adhere to the inner covering.

The inner sheath thickness for cables with a number of cores not exceeding five shall comply with the specified value given in Tables v or VI. For cabfcs with more than five cores the specified value for the Thickness of the inner sheath rs 0.8mm.

4.1.3.7

Combined і

TtiiF

ur,'protective earth tPE) corxtuciof

4

The armour/FC conductor shall be applied around the inner sheath as a braid or in helical form.

The armour/PE conductor shaM comply with the following requiremeots.

4,1,3 7,1 Сргґфобйірп

The arrnourfPE conductor shall consist of:

• a braid of galvanised steel wires or plain or tinned copper wires with a continuous flat braided conductor of tinned copper wires underneath,

or

' an assembly of round or flat galvanised steel and plain or tinned cupper wires, surrounded by a counter-helix of galvanised steel tape or plain or tinned copper tape.

or

■ an assembly of round or flat, plain or tinned, copper wires surrounded by a counter-hefix of (Яаю or tinned copper tape.

The armour/PE conductor may be covered by a separator of non- hygroscopic material,

The thickness of the dements shal not be less than the specified value for each type and Site of cable shown in Tables V, VI and VII as appropriate.

.1.3.7,2 Copper conductor for earth connection

The connection of the armour/PE conductor other than a complete copper armour, to earth shall be posses by means of one or more continuous copper conductors In contact with or forming part of the armour/PE conductor.

The croeє-sectional area of the braided conductor or of each of the latter copper conductors shall be at least 1mm¹ and the total cross-sectional area shall not be less than 60%, with a minimum of of the nominal copper equivalent cross'Sectional area

of the ar mo иг/PE conductor which is specified in Tables V. VI and VII as appropriate: the electrical resistance however being the criterion,

4.1.3. 3 Covering of the innar sheath

The surface of the inner sheath shall be covered by the armour/PE conductor for at least 80% and th# gap between the elements shall not exceed 2mm.

4.1.3.7 4 Check of construction

Compliance with the above specified requirements shall be checked by inspection and measurement. For the percentage of coverage of a braided armour/PE conductor the calculation method is given in sub-clause 2,1,7 of HD 605

4 1 '3.7.5 Electrical resistance

The electrical resistance of the combined armour/РЕ conductor shall not exceed the specified value for each Type and size of cable shown in the ТаЫе V, VI and Vtlt as appropriate.

Addmonally, the resistance of the armour/PE conductor measured on a length of 20m with (he current source at one side connected io 5% of the number of elements of the braided armour or two adjacent steel wires of the helically applied armour shal not exceed 2.5% of the specified maximum value per km. Compliance shall be checked by the test given in sub-clause 3.1.3.1 and 313.2 respectively of HD 605.

4.1.3.7.6 Mutual interaction

There shall be no harmful interactions between the armour/РЕ conductor and the inner sheath or oversheath. Inspection after the test given in HD 505.1.2, sub-clause 8.1.4 shall show no impairment of the armour/РЕ conductor.

The following ageing conditions apply: - temperature £100 * 21^eC

- duration 7 x 24h

4 1*3*8 Separator

The separatee if any, shall consist of * plastic tape or an equivalent layer around the armour/PE conductor.

4X3*9 Overshfiath

The oversheath shall be polyvinyl chloride compound of Type PVC/ST complying with the non-etectncal «equwemenu given in Table t The oversheath shall be applied around the armour/P^ conductor, or a tape rf eny. The thickness of the oversheath fex cables with • number of cores not exceeding five, shall comply with the specified value given in Tables V or VI. For cables with more than five cores the specified value for the thickness of the overflheath is 1.8mm for cables with a number of cores up to and including 40 and 2.1mm for cables with more than 40 cores.

41,3.10 0varaH diameter

For cables with an armour/PE conductor no limits tor the mean overall dimeter are preschbed-

4.1.4 Tests

Compliance with the requirements of sub clause 4.1.3 and the appropriate requirements of Part 1 shall be checked by inspeevon and by the tests specified in Table H*A,

4,2 Screened cables: Double sernerxyd. cross linked poK ethylene insulated and oolwinvl chloride Sheathed cable

(Under consideration by TC201

YMvKafas mb tor single core cables V’YMvKafas mb for multicore cables

0.6Л kV

й»?М

Number of copper conductors 1, 3 or 5.

Conductors shall comply with the requirements of HD 383* For each sin of cable the class of conductor is given in Table VIII.

4*2.3.2 Separator

A separator of suitable material may be applied around each conductor. If required, tapes may be applied to comply with fire resistant requirements-4 2 3.3 Insulation

The insulation shall be XL PE compound complywig with the non-electrical requirements Given In Table 1. The insulation thickness shall comply with the value specified in Tables VIII.

The core of single core cable shall be coloured green/yehow. For three and five core cables the core with the largest cross-sectional area shall be coloured green/ydlaw.

The cores of multicore cables shall be twisted together A centre Idler may be used

4.2.3.в Inner covering

The twisted cores shsN be covered by an extruded inner covering consisting of an unvulcanised rubber or plastic compound. It shall be possible to separate the cores easily.

4 2.3 7 InMr «heath for muhHjorg cable

The sheath shell be polyvinyl chloride compound of Type PVC/ST complying with the non*eloctrical requirements given in Table L The sheath shaN be applied around the inner covering.

It shall fit dosefy but not adhere to the inner covering. The sheath thickness shall comply with the specified values given in Table VIIL

42.3.8 Sheens

42.3.8,1 Comooskipn

The screen shall be composed as follows:

• a symmetrical galvanised steel wire braid;

• a separator of norvhygroscoplc material Ie g a tape or an extruded layer);

• a symmetrical plain or tinned copper wka braid.

The screen shall be applied around the insulation of single core cables and around the inner sheath of multicore cables.

The screen may be covered by a separator of noohygroscopic material

4 2.3.92 D.an-ieler ot the w«ras

The nominal diameter of the wires of the braid shall not be less than the specified value for each size of cable shown in Table VIII

However, each value measured shah not be less than 90% of the nominal value plus 0,03mm nor be more than 110% of the nominal value plus 0.03mm.

Compliance with the above mentioned requirements shaM be checked by inspection and measurement.

4 2 3.8 3 Electrical resistance

The electrical resistance of the copper braid shall not exceed the specified value for each size of cable shown in ТаЫе VNL Compbance shaH be checked by the test given in sub-clause 3X4.1 of HD 605.

4.2.3-84 Screening efficiency

The transfer impedance at the frequency of 30 MHz shal not exceed lOohm.'knv

Compliance shal be checked by the test given in ІЄС 96-1, Sub’ clause A. 5,1 and A. 5,2.

4X3.9 Separator

The separator, И any, shall consist of a plastic tape or an equivalent layer around the screen.

The I over) sheath shall be polyvinyl chloride compound of Type PVC/5T complying with the non -electric al requirements given in Table I. The sheath end oversbeath shall be applied around the screen or separator, if any, of respectively single core and multicore cables.

It shall fh doeely but not adhere to the screen. The thickness of the (over! sheath shall comply with the specified value given in Table VIII,

For screened cables no knruts for the mean overall diameter are prescribed.

4.2.4 Tests

Compliance with the requirementsof sutbdause 4.2.3 and the appropriate requirements of Pan 1 shall be checked by inspection and by the tests specified in Table U-B.Table I - Requirements for the non-electrical test for cross-lriked polyethylene
insulation and polyvinyl chloride sheath

П) Variation: difference between the median vaiire after ageing and the median value without ageing,

expressed as a percentage of the latter■

2. Only when tensile test after ageing is not practicable because of adherence between insolation and conductor or separator, it any.

T

<31

able І (coniinutd} - Requirements foe the noo-eteetr«cM test for cross-linked poly ethylene
insulation and polyvinyl chloride sheath

diffarance between the me dim vdAj« after ag«ng «nd the medierj value without agaeig, іхргнмгі aa a percerrtape of the tetter.Table I (continued) * Riquipmenu lor the non^ectricai test for cross-linked polyethylene
insulation and polyvinyl chloride sheath