Страница 6: ДСТУ HD 604 S1:2012/Зміна №1:2012. Зміна №1 (англ) (61674)

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.

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 HD 405.3 (Appendix 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 value of oxygen index of the insulation, bedding and oversheath shall be determined using the test method given in HD405.3 (Appendix B). The values obtained shall fall within the agreed tolerance on the nominal value.

When tested in accordance with sub-clause 2.4.12.2 of HD605, but using a temperature of (80 ± 2)°С, the material shall comply with Table 27.

The oversheath resistance measurement shall be made between the armour and the water. The test voltage shall not be less than 500V d.c., 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 1M ohm per km when corrected to 20°С.

3. Cables without metallic covering

Not applicable.

4. Cables with metallic covering

   1. Code designation

(Under consideration by TC20.)

0.6/1 kV and 1.9/3.3kV.

The conductors shall be of the material and type detailed in tables 3 to 14 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 17 and 18.

The insulation shall be polyvinyl chloride compound type TH complying with the non-electrical requirements given in Table 1 and the insulation resistance requirements given in clause 2.4.3.

The insulation thickness shall comply with the value specified in tables 3 to 14.

The cores of cables having two. three or four cores shall 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 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

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HD 604 S1:1994/A1:1997

Part 3 Section E

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

The thickness shall comply with the values specified in Tables 3, 4 and 11.

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 14.

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 5 to 10 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 3 to 14, 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 mufti-core cables having solid aluminium conductors the armour shall consist of a single 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:

(a) The diameter of round armour wire shall fall within the minimum and maximum wire diameters specified in table 15 when measured in accordance with sub-clause 2.1.4.3 of HD 605.(Ы The mass of zinc coating of galvanised steel armour wire shall not be less than that given in table 16 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^J 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 4,6.8,10,12 or 14 of this section as appropriate, by more than 10%. The method of measurement shall be in accordance with sub-dause 2.1.4.3 of HD 605.

6. The tensile strength of individual strips of aluminium armour shall not be less than 145N/mm* 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 17 to 21 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 ail surface irregularities shall be removed.

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

4.3.6 Oversheath

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

The oversheath thickness shall comply with the specified value in tables 3 to 14 of this section.

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.

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.

4.4 Tests

Compliance with the requirements of clause 4.3 shall be checked by inspection and by the tests specified in table 2.

Table 1 : Requirements for the non-Electrical test for Polyvinyl Chloride

Table 1 : (concluded)