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When tested in accordance with HD 605 sub-clause 2.4.12.2, the sample being aged for seven days at 100±2°C, the values shall comply with table 26.

Type 1

When a sample of completed cable is tested in accordance with sub-clause 2.4.5 of HD 605, the oversheath shall be deemed as satisfactory provided that, following the test, examination of the sample without magnification reveals no cracks or splits in the internal or external surfaces.

Type 2

When a sample of completed cable is tested in accordance with sub-clause 2.4.5 of HD 605, the oversheath shall be deemed as satisfactory provided that, following the test, examination of the sample without magnification reveals no cracks or splits in the internal or external surfaces and when tested in accordance with 2.4.2 the cable shall not fail.

This shall be measured between the armour and the water as in HD 605 sub-clause 3.3.4, except that the nominal voltage shall not be less than 500V d.c.

The insulation resistance shall not be less than 1 MQ.km when corrected to 20°C.

When tested in accordance with HD 605 sub-clause 3.2.4.1, no breakdown of the insulation shall occur when the sample is subjected to 10 positive and 10 negative pulses at the appropriate level below. The test shall be applied with the cable at ambient temperature and for З-core cables the 3 cores shall be tested in sequence.

The tests given in table 1A shall be undertaken either on a sample taken from the cable or on a sample of complete cable, as appropriate.

When shown, tests shall be undertaken on aged and unaged samples. Ageing shall be in accordance with HD 605 sub-clause 5.1.1.

Test requirements are given in table 1A.

For fire propagation tests, oxygen index test and smoke emission test,

- select a cable having a tabulated diameter not exceeding 15mm, and also a cable having a tabulated diameter between 26mm and 40mm with a conductor size greater than 25mm².

The cable tested may have copper or aluminium conductors and steel or aluminium wire armour, and satisfactory performance will be acceptable to cover other conductor and armour materials. Similarly, the cable tested may be rated at either 0.6/1 kV or 1,9/3.3kV. However, a test will only be accepted as covering the particular insulating material (XLPE or HEPR) used in the sample.

For the corrosive and acid gas test, select a sufficient number of samples to ensure that each material type to be used has been tested.

One each of the following samples shall be selected for fire performance tests:

i) 4x120mm² cable size ii) 2x2.5mm² cable size

For the corrosive and acid gas test, select a sufficient number of samples to ensure that each material type to be used has been tested.

The cable shall be subjected to the test specified in HD 605 sub-clause 4.1.4, using the cable arrangement for Category 2 for sizes greater than 25mm² and that for Category 3 for sizes less than or equal to 25mm².

The test shall be considered satisfactory if, after burning has ceased, or the flames have been extinguished:

1. penetration to the conductor has been achieved on one third or more of the total number of cables, and

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 burner, measured at the front and rear and, where applicable, between the cable assembly.

During the fire performance 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 HD 405.3 Annex B. The values obtained shall be used to enable a nominal value, together with suitable tolerances for sample tests, to be agreed between manufacturer and purchaser.

For sample tests, the oxygen index of the insulation, 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 tolerances on the nominal value.

Where 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.

Type 1 and Type 2 (Sample test)

When tested in accordance with HD 606.2, the minimum level of light transmittance .throughout the test shall be greater than 60%.

Type 2 (Type test)

When tested in'accordance with HD 605 sub-clause 4.2.2, the test shall be considered satisfactory if Ao (OFF) does not exceed a value of 10.

Type 1 and Type 2 (Sample test)

When tested in accordance with IEC 754-1, the level of HCI in the material under test shall not be greater than 0.5%.

Type 2 (Type test)

When tested in accordance with HD 605 sub-clause 4.3.1, the average pH, conductivity and chloride yield shall be:

3.8 < pH < 10

conductivity < 80/yS/cm

chloride yield < 0.5mg/g

3. Cables without metallic covering

Not applicable.

3. Cables with metallic covering

   1. Code designation

(Under consideration by TC20)

The conductors shall be of the material and type detailed in tables 4 to 17 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 Table 19.

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

Alternatively, for 0.6/1 kV Type 2 cables having 2-4 cores with copper conductors (Tables 6B, 8B and 10B), the insulation shall be either a single extruded layer of thermosetting TIZ material complying with the requirements of Table 1, or two bonded layers of extruded thermosetting material complying, as a composite, with the requirements of TIZ given in Table 1.

The corrosive and acid gas emission of the insulation shall meet the requirements given in 2.7.6.

The insulation thickness shall comply with the value specified in tables 4 to 17.

The cores of cables having two, three, four or five cores shall be laid-up with a right-hand or right-and-left-hand alternating direction of lay. For multi-core auxiliary cables the direction of lay shall alternate for each successive layer. Auxiliary cables having up to and including seven cores may be laid-up with a right-hand or left-hand or with a right-and-left­hand alternating direction of lay. Where necessary, synthetic fillers, which may be applied integrally with the bedding, shall be used to form a compact and reasonably circular cable.

The corrosive and acid gas emission of fillers and binder tape shall meet the requirements given in 2.7.6.

The bedding shall consist of an extruded layer of synthetic material compatible with the operating temperature of the cable and shall comply with the requirements in table 2 as follows:

ZB1 compound for Type 1 cable

ZB2 compound for Type 2 cable

The corrosive and acid gas emission of the bedding shall meet the requirements given in 2.7.6.

The bedding thickness shall comply with the values specified in tables 4 to 17.

The armour shall consist of a single layer of wires having nominal dimensions as given in tables 4 to 17, as appropriate.

For single core cables, the armour shall consist of aluminium wires.

For multi-core cables with copper conductors, the armour shall consist of a layer of galvanised steel wires.

For multi-core cables with solid aluminium conductors, the armour shall consist of a layer of aluminium wires.

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.

Wire 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 18 when measured in accordance with 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 18 when measured in accordance with sub-clause 2.5.1.1 of HD 605.

3. The steel 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’ when measured in accordance with sub-clause 2.3.1.1 of HD 605.

5. The d.c. 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 shall be made by cold pressure or fusion welding and all surface irregularities shall be removed.

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

The oversheath for Type 1 cables shall consist of an extruded layer of black compound complying with the requirements of ZM1 given in Table 2.

The oversheath for Type 2 cables shall consist of either an extruded layer of black compound complying with the requirements of ZM2 given in Table 2, or a dual-extruded layer of compounds, one of which complies with the requirements of ZM2 given in Table 2. In the case of a dual-layer oversheath, the minimum thickness of each layer shall not be less than 0.8mm nominal. The outer layer shall be black.

The corrosive and acid gas emission of the oversheath shall meet the requirements given in 2.7.6.

The oversheath for single-core cables may have a suitable semi-conducting coating to enable the resistance of the oversheath to be determined after the cable has been installed. The coating shall be capable of withstanding the rigours of installation and shall adhere to the surface of the oversheath when the cable is operating at maximum conductor temperature.

The oversheath thickness shall comply with the specified value in tables 4 to 17.

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

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

TABLE 1 (concluded)