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

As an alternative to the mark of the Approval Organisation, an identification thread may be incorporated into the cable, as specified by the Approval Organisation.

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-clause 2.3.1 - 2.3.3.

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

2.4 Additional test requirements

Make the measurements of thickness of insulation, extruded inner sheath and oversheath listed in the schedule of test requirements (Table 3) on a sample taken from one end of each drum 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 sub-clause 4.3.2, 4.3.4 and 4.3.6 of this part, then two further samples shall be checked for the non-compliant items. If both samples meet the specified requirements the cable is deemed to comply, but if either does not meet the requirements, the cable is deemed not to comply

If a single core cable is provided with a semi-conducting coating applied, it shall be subjected to an applied voltage of 3kV a.c. r.m.s. or 5kV d.c. for one minute, in accordance with sub-clause 3.2.3.1 of HD 605, and the oversheath shall not break down.

When the voltage test is carried out in accordance with sub-clause 3.2.1 of HD 605, using the test voltage below for a duration of 5 minutes, the insulation shall not break down.

When tested in accordance with sub-clause 3.3.1 of HD 605 the values measured shall not be less than the minimum specified value of К = 3.67 MDkm measured at 90°C.

The oversheath resistance measurement shall be made between the armour and the water. The test voltage shall not be less than 500V de and shall be applied by the method given in sub-clause 3.3.4 of HD 605.

The oversheath resistance shall not be less than the minimum specified value of 1 M ohm per km when corrected to 20°C.

When tested in accordance with sub-clause 2.4.12.2 of HD 605, but using a temperature of (100± 2)°C, the material shall comply with the values given in table 30.

Type approval for the complete range of single-core cables specified for this type or limited range of sizes is obtained by carrying out the tests given in sub-clause 4.1.1 of HD 605 on one cable size.

The cable size selected for test for the range for which approval is sought shall be that which has the greatest ratio of sectional area in mm² of non-metallic material to that of all the metallic components. Tests carried out in cables having aluminium conductors will also cover cables having copper conductors but not vice versa. Tests carried out on aluminium strip armour will also gain approval for wire armour and vice versa.

Type approval for the complete range of multicore cables specified for this type is obtained by carrying out the tests given in sub-clause 4.1.1 of HD 605 on a cable having copper conductors not exceeding 16mm² and also on a cable having aluminium conductors of 35mm² or larger.

Limited approval of 16mm² and below can be obtained by carrying out the tests given in sub-clause 4.1.1 of HD 605 on a cable having copper conductors not exceeding 16mm². Limited approval for cables greater than 16mm² can be obtained . by carrying out the tests in sub-clause 4.1.1 of HD 605 on a cable having aluminium conductors of 35mm² or larger.

The cable sizes selected for test shall be those which have the greatest ratio of sectional area in mm² of non-metallic material to that of all the metallic components. Tests carried out on aluminium strip armour will also gain approval for aluminium wire armour and vice versa.

When the oxygen index of the insulation obtained during the fire perfomance type tests is less than a value of 21, there is no need to check the value during sample tests.

The test shall be considered satisfactory if, after burning has ceased, or the flames extinguished in accordance with sub-clause 4.1.1 of HD 605:

1. Penetration to the conductor has been achieved on all the front row of cables

2. The cables have been wiped clean and the charred portion has not reached a height exceeding 2.5m above the bottom edge of the upper burner, measured at the front, rear and where applicable between the cable assembly. Inspection shall be made of the internal surfaces of closely packed cable installations to ensure that the damage does not exceed the limits specified.

2.4.6.4 Oxygen index test

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

For sample tests the value of oxygen index of the bedding and oversheath shall be determined using the test method given in HD 405.3 (Annex B). The values obtained shall fall within the agreed tolerance on the nominal value.

When the oxygen index of the insulation, obtained during the fire performance type tests, is less than a value of 21, there is no need to check the value during sample tests.

3. Cables without metallic covering

3. Not applicableCables with metallic covering

   1. Code designation

(Under consideration by TC20)

0.6/1 .OkV and 1.9/3.3kV.

The conductors shall be of the material and type detailed in tables 4 to 18 and shall comply with the requirements of HD 383:

Class 1 for solid conductors

Class 2 for stranded conductors

Circular sectoral conductors are formed from four 90° segments without any insulation between them. These shall comply with the material requirements of HD 383 and the resistance requirements of Tables 19 and 21.

The insulation shall be either cross-linked polyethylene (XLPE) or hard ethylene propylene rubber (HEPR) complying with requirements given in Table 1.

The insulation thickness shall comply with the values specified in Tables 4 to 18.

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

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

The inner sheath shall consist of an extruded layer of polymeric compound type TB1 complying with the requirements given in Table 2.

The thickness shall comply with the values specified in Tables 4, 5 and 15.

Unless otherwise specified the bedding shall consist of an extruded layer of polymeric compound type TB1 complying with the requirements given in Table 2.

For extruded inner coverings the thickness shall comply with the values specified in tables 7 to 14 and 16 to 18.

It is permissible for 0.6/1 kV cables having a nominal conductor cross-sectional area of 16mm² and above to have taped bedding as indicated in tables 7 to 14 comprising two or more layers of PVC or other synthetic tape. The taped bedding shall be approximately 0.8mm thick.

When taped bedding is used it shall be applied such that any gaps between adjacent edges of each tape are not coincident through the thickness of the 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: The thickness of taped bedding need not be checked by measurement.

The armour shall consist of a single layer of wires or strips having nominal dimensions as given in tables 4 to 18, as appropriate. The armour shall be applied helically with a left-hand lay for cables having up to and including four cores. For multi-core 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 alternating right 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 or aluminium conductors the armour shall consist of aluminium wire. For single core cables having solid or sectoral aluminium conductors the armour shall consist of aluminium wire or strip.

For multicore cable having solid aluminium conductors the armour shall consist of a single layer of aluminium wires or strips.

For multicore 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.

1. The diameter of round armour wire shall fall within the minimum and maximum wire diameters specified in table 28 when measured in accordance with clause sub-clause 2.1.4.3 of HD 605.

2. The mass of zinc coating of galvanised steel armour wire shall not be less than that given in table 29 when measured in accordance with sub-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 shall not be less than 125N/mm^z when measured in accordance with sub-clause 2.3.1.1 of HD 605.

5. The thickness and width of individual strips of aluminium armour shall not differ from the values specified in tables 5, 8, 10 or 12 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.

6. The tensile strength of individual strips of aluminium armour shall not be less than 145N/mm² when measured in accordance with sub-clause 2.3.1.1 of HD 605.

7. The de resistance of the armour of the complete cable measured and corrected to 20°C shall not exceed the appropriate value given in tables 19 to 23 of this part when measured in accordance with sub-clause 3.1.2 of HD 605.

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

Joints in aluminium wires or strip shall be made by cold pressure or fusion welding and all surface irregularities shall be removed.

Any joint in any wire or strip shall not be less than 1m from the nearest joint in any other armour wire in the complete cable.

Tapes may be applied under or over the armour layer.

The oversheath shall be an extruded layer of black PVC compound complying with the requirements given in Table 2.

The oversheath thickness shall comply with the specified value in Tables 4 to 18.

The oversheath for single core cables may have a suitable semi-conducting coating to enable the integrity of the oversheath to be determined after the cable has been installed in air.

The coating shall be capable of withstanding the rigours of installation and shall adhere to the surface of the sheath when the cable is operating at maximum conductor temperature.

NOTE: Oversheaths are normally black, but colours other than black may be provided by agreement between the manufacturer and purchaser, subject to their suitability for the particular exposure conditions under which the cables are to be used.

Compliance with the requirements of sub-clause 4.3 shall be checked by inspection and by the tests specified in Table 3

1. .

Requirements for the non-electrical tests for 90°C insulation

(11 Variation: Difference between the median value after ageing and the median value without
ageing, expressed as a percentage of the latter.

TABLE 1 (concluded)