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(NOTE: 4 x 50 shall indicate a 4-core cable with 50mm* copper conductors}.

(ЙІ Aluminium conductor cables: 4 x 5OAL

[NOTE: 4 x 50 AL shal indicate a 4core cable with 50mm* aluminium conductors!, lift) Copper conductor cables with reduced neutral: 3 x 50/25

(NOTE: 3 x 50/26 shal indicate a 4<o*e cable with three 50mm* copper phase conductors and one 25mm* copper neutral conductor J

The marking of the Elements 1 -4 ahal be by embossing o< indenting on the oveesheath.

For cables with tabulated approximate overall diameters above 15mm_r Elements 1 _r2 and 3 shall appear, in any sequence that neither confuses nor conflicts, on two or more primary lines along the axis of the cable, approximately equally spaced around the circumference of the cable Elements 4 and 5 shaft appear on at least one lot, which may be one of the primary lines, or a secondary line or hnes. They may appear in any sequence that neither confuses nor conflicts, and need not aS be on (he same line.

For cables with tabulated approximate overall diameters of 15 mm or smaller, the Elements shall be disposed as for cables above 15mm except thar the marking for Elements 1, 2 and 3 shall appear on one or more primary lines.

The letters and figures shall consist of upright block characters. The characters shall have a minimum height of 3 mm.

The distance between the end of one element of marking and the beginning of the next identical element of marking shall not be greater than 550 mm. for Elements 1,2 and 3, and not greeter than 1100 mm for Elements 4 and 5.

Compliance sh*n be checked by visual examination and measurement.2*3-2 Identification of year of manufacture

A munx of identifying the year of manufacture of the cable ahail be provided throughout the length of the cable, either internally or by marking on the surface of the саЫе.

M the identification Is internal the distance between the end of one mark and the beginning of the next mark shall not be greater than 560 mm. As an after native internal marking, an identification thread may be used.

If the identification is by marking on the surface it shall comply with the requirements given for Elements 4 and 5 in sub-clause 2. 3.1 in respect of maximum distance between marks.

И the mark of an Approval Organisation is used it shall be provided throughout the length of the cable

If the mark is applied to the cable it shall be on the surface in the form of the symbolist specified by the Approval Organisation, and shall comply with the requirements given for Elements 4 and 5 ki sub-сіаим 2.3.1 in respect of maximum distance between marks.

Ab an alternative to the mark of the Approval Organisation, an identification thread may ba incorporated kito the cable, as specified by the Approval Organisation.

2X4 Optional marking

The use of optional marking is permitted. Where such marking is made it shall be throughout the length of the cable and may be on the external surface of the cable, or by means of a tape or thread within the cable, or by a combination of these methods. If the additional marking Is applied to the surface of the cable it shall not render illegible the marking specified in sub-clausa 2*3*1 - 2*3.3.

The additional marking, however made, shall be repeated at intervals not exceeding 1100mm.

Make ths measurements of thickness of insulation, extruded inner sheath and oversheath Mated in the schedule of test requirements (Table 21 on a sample taken from one end of each efrurn length of cable selected for the test, having discarded any portion which may have suffered damage.

If any of the thicknesses measured does not comply with sutbeiauses 4.3*2, 4*3.4 and 4.3,6 of this Pari, then two further samples shall be checked for the non-compliam items. If both samples meet the specified requirements the cable is deemed to comply, but И either does not meet the requirements, the cable is deemed not w comply2 4.2 Voltage tail

When tested in accordance with sub*ciaui< 3.2.1 of HD 605, using a test voltage of 3.5kV lor a duration of 5 mine., the insulation shad not break down.

2*4.3 кіаиййоп resistance

When a sample of insulated core is tested in accordance with sub-dame 3,3.1 of HD 605 the К value at 20°С shall not be less than 0.037 MQ.km

When complete cable is tested An accordance with sub-clause 3.3.2 of HD 605 the values measured shal not be less than those given in table 23.

2.4.4 Approve for testa related to fire conditions.

Type approval for rhe complete range of single^core cables specified for this type or limited range of sizes is obtained by carrying out the tests given in HD 405.1 and sub- da use 4.1 J of HD 606 on one cable size.

The cable size selected for test from the range for which approval is sought shall be that which has the greatest ratio of sectioned area in mm of non-metallic material to that of all the metalhc components. Tests carried out on cables having aluminium conductors wil also cove/ cables having copper conductors but not vice versa. Tests carried out on aluminium stop armour will also gain approval for wire armour and vice versa.

Type approval for the complete range of multi-core cables specified for this type is obtained by carrying out the tests given in HD 405.1 and Sub clause 4 J,1 of HD 605 on a cable having copper conductors not exceeding 16mm¹ and візо on a cable having aluminium conductors of 35mm* or larger

□mixed approval of 16mm* and below can be obtained bv carrying out the tesu in sub- clausa 4.1 J of HD 605 on a cable having copper conductors not exceeding 16mm¹. limited approval for cables greater than 16mm* can be obtained by carrying out the test* in sub-clause 4 J. 1 of HD 606 on a cable having atuminium conductors of 35mm* or larger.

The cable sizes selected for test shall be those which have the greatest ratio of sectional ama in mm* of non-metallic material to that of aH the metallic components. Tests carried out on aluminium strip armour will also gain approval for aluminium wire armour and vice versa.

2.4Л.З Test requirements

The test ahalt be considered satisfactory it aher burning has ceased, or the flames extinguished in accordance with sub-dause 4.1.1 of HD 605:

[H Penetration to rhe conductor has been achieved on аЛ the front row of cables.(Щ The cables, have been wiped скап and the charted portion has not reached a height exceeding 2 5m above the bottom edge of the upper burner, measured at the from, rear and where applicable between the cable assembly Inspection shall be made of the ettemal surfaces of closely packed cable insta I aliens to ensure that the damage docs not exceed the limits specified.

2 4.4.4 Oxygen index test

During type tests the absolute oxygen index of samples of insulation, bedding and oversheath, taken from the complete cable, shall be determined using the test method given in prHD 405.3 (Appendix B|. The values obtained shall be used to enable ■ nominal value together with suitable tolerances for sample tests to be agreed between manufacturer and purchaser.

For sample teats the value Of oxygen index of the rautattan, bedding and ovqrshaath shall be determined using the test method given in pr HD4Q5.3 (Appendix B). The values obtained shall fall within the agreed tolerance on the nominal value.

2. Б Compatibility test

When tested in accordance with sub»clause 2,4,12,2 of HD6O6, but using a temperature of (80s2l°C_r the material shall comply with Table 26.

2. Cables without metaMk; сслдолд

Not applicable.

2. Gables with matalic covenno

4 1 Code ttestanaikm

(Under consideration by TC20J

0-6/1 kV,

The conductors shall be of the material and type de tailed in tables 3 to 11 and shall comply with the requirements of HD 363:

Class 1 for sold conductors.

Class 2 for stranded conductors.

Th® insulation Sheil be polyvinyl chloride compound type ТИ complying with the nonelectrical require monte given in Table 1 end the insulation resistance requkernema given In clause 2.4.3.

The insulation thickness shea comply with the value specified in tables 3 to 11.

4 3 3 Assembly of cores

The cores of cables having two. three or four cores than be laid-up with a right-hand or a right and left-hand alternating direction of lay. For multi-core auxiliary control cables the direction of lay shal alternate for each successive layer,

For auxiliary control cables having up to and including seven cores it Is permissible for cores to be Wd-up with a right-hand or left-hand or with a right and left-hand alternating direction of lay.

4.3.4 Inner sheath

4.3 4.1 Single <Х»Є Mbits

The inner sheath shall consist of an extruded layer of polymeric compound гур® TB1 complying with the requirements given in Table 1.

The thickness shad comply with the values specified in Tables 3 and 4.

4.3.4.2 МцЦі-сог® cables

Unless otherwise specified the bedding shall consist of an extruded layer of polymeric compound type TB1 complying with the requirements given in Table 1.

For extruded inner coverings the thickness shall comply with the values specified in tables 5 to 11.

When specified it is permissible for cables having a nominal conductor cross-sectional area of 10mm³ and above to have taped bedchng as indicated in tables 5 to 10 comprising two or more layers cl PVC or other synthetic tape The taped bedding shal be approximately O.flmm chick.

When taped bedding is used it shall be applied such that any gaps between adjacent edges of each lap® are not coincident through the thickness of die bedding. If there is a gap between adjacent edges of each tape it shall not exceed 15% of the tape width. The method of measurement of gap between tapes is given in sub-clause 2.1.8 of HD 605.

NOTE: Th® thickness of taped bedding need not be checked by measurement.

4.3.5 Armour

The armour shall consist of a single layer of wires or strips having nominal dimensions as given in tables 3 to 1L as appropriate. The armour shall be applied helically with a left-hand lay for cables having up to and including four cores. For mufti-cor® auxiliary cables the armour shall be applied helically with a direction of lay opposite to that of the final layer of cores, except that for cables which have been laid up with aAternating fight and left-hand lay the armour may be applied with either a right-hand or a left-hand lay.

For single core cables having stranded copper conductors the armour shall consist of aluminium wire. For single core cables having solid or sectoral aluminium conductors the armour may consist of aluminium wire or strip.

For multi-core cables having soEd aluminium conductors the armour' shall consist of a skigte layer of aluminium wires or strips.

For multi'Core cables having copper conductors, the armour shall consist of a single layer of steel wires

Wire or strip armour shall comply with the following as appropriate:

(al The diameter of round armour wire shall fall within the minimum and maximum wire diameters specified in table 12 when measured in accordance with aub-clause 2 J ЖЗ of HD 605.

ІЫ Ths mass of rinc coating of galvanised steel armour wire shall not be less than that given in tabic 13 when measured in accordance with aub-clause 2.5.1.1 of HD 605.

3. The wire shall be subjected to the wrapping test specified in sub-clause 2.3 2 of HD 605 and shall not break.

4. The tensile strength of aluminium armour wires shad not be less chan 125hi/mm* when measured in accordance with sub clause 2.3.1.1 of HD 605.

(el The thickness and width of Individual strips of aluminium armour shall not drffer from the values specified in tables 4,6,8 or 10 of this section as appropriate, by more than 10%. The method of measurement shall be in accordance with sub clause 2.1.4.3 of HD 605.

tft The tens^e strength of individual Strips of aluminium armour shall not be less than 145МУгпт’ when measured in accordance with sub-clause 2.3.1.1 of HD 605.

3. The de resistance of the armour of the complete cable measured and corrected to 2t>*C shall not exceed the appropriate value given in tables 14 to 1 d of this pan whan measured in accordance with sub* clause 3.1 -2 of HD 605.

Joints in steel armour wire shall be beared or welded and any surface irregularity shall be removed.

Joints in aluminium wires or strip shaN be made by cold pressure or fusion wdding and all surface irregularities shaft be removed.

Any joint in any wire or strip shall be not less than Im from the nearest joint in any other armour wire in the complete cable.

4 3.6 Dversheatn

The oversheath shall be an extruded layer of black PVC compound Type TM1 complying with the requirements given In tabte 1.

The oversheath thickness shall comply with the specified value in tables Э to 11 of this section.NOTE: Oversheaths are normal у black, but colows other than black may be provided by aoraement between the manufacturer and purchaser, subject to the к sort ability for the particular exposure conditions under which the cables are to be used.

4,4 lasts

Compliance with the requirements of dausa 4.3 shall be checked by inspection end by ths tests specified in table 2

.ТаЫе 1 : Requirements for the non-Etectrical test for Polyvinyl Chloride

ТаЫе 1 : {concluded)