---

nv

91

al Code designation in accordance with sub-claim 4 J

1Ы Number and cross-section of conductors and cross section of concentric conductor

(Ci Rated voltage IUI

(d) Year Of manufacture (two last digits)

The marking shall be made by printing, embossing or indenting on the ovar&heaih, The marking, if printed, must be resistant to conditions in the ground.

The sequence of marks shall be as given above and th* marks shal be kept together in a group.

The distance between groups of marks shal not exceed Im,

A meter marking with reasonable accuracy shall be applied an the oversheath and in such a way that it does not interfere whh th* marking in sub-clause 2.3.1.

If the mark of an Approval Organisation is used on the cable ft shall be provided throughout th* length of the cable and in such a way that it does not interfere with other markings.

If th* mark is applied on the oversheath the distance between marks shall not exceed 1m.

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

The use of optional marking it permitted. Where such marking is made it shal be throughout the length of the cable, and may be on the external surface of th* cable, or by means of * tape or thread within th* cable, or by a combination of these methods. If th* additional marking is applied to the surface of the cable it shall not interfere with the marking specified in sub-clause 2.3.1-2 3-3.

Th* additional marking, however made, shall be repeated at intervals not exceeding Im.

2 4 Additional test геоикатапц

2.4 J Sampling for thickness measurement

The measurements of thickness of insulation and oversheath, Meted in Table IL Schedule of Teets, shall be made on two samples of cable, taken one from each end of the cable selected for the test, having discarded any portion which may have suffered damage.

If any of the thicknesses measured does not comply with the requirernenU in sub- clauses 4 3 2 end 4.3,5. then two further samples shall be chocked for the non- compkant items, if both samples meet the specified requirements the cable ia deemed to comply, but If either does not meet the requirements, the cable is deemed not to comply.

2.4.2 Voltaoe test

14,2.1 Voltage test on о ver the a th

When testing the oversheath in water in accordance with HD 605, tub- clause 3.2.3.1, the following test conditions shaN apply:

' Length of test cable: not less than 10 m;

- Test voltage between concentric conductor and water: 4kV AC; - Duration of test: 4h*

The cable shaN ba immersed In the water for at least one hour before the test voltage is applied.

ho breakdown shall occur.

2.4.2.2 Vokanetest onspree

When testing the cores according to HD 605, sub-clause 3.2 >2,2, the fottowing test conditions shall apply:

* Length of cores: not less than 10m - Test voltage: 4kV AC - Duration of test: 4 h.

No breakdown shaN occur.

2.4,23 Soark test on oversbeath

When spark-testing the oversheath in accordance with HD21.2, sub-clause 2.6Л, the speed of the cable and length of the electrode shall be chosen so that the tfwelling-itma of each point of the cable ki the electrical field is at least 0.1 s. The test voltage shall be either fJkV AC or 15 kV DC-

No breakdown shall occur

.2,4.2 .4 Vottaoe tert on сотой ted cable

When the cable ►* tested in accordance with HD 605. sub’dauaa 3.2.1. the test vdtage shaft be 3.5 kV AC and the duration five nunjtw. Aftemativety the test voltage may be 15 kV DC and the duration one minute

No breakdown shall occur.

When the cable cores are tested In accordance with eub-clause 3.3.1 of HD 605 at 70°С the volume resistivity shall not be less than 1O'^e Ckm

This и a type test which shall bo performed on the cable with the smallest conductor cross-section of the cable type to be covered by the test and, when appropriate, on the cable with the smallest number of core*. When testing cables in accordance with HD 405.3 separata tests shall be made for cables with conductor cross-sections up to and including 35mm’ and for cables with conductor cross-section.* greater than 35mm if such cross-secbone are to be covered by the type test. If material* or designs of ths cable type to be tested varies with the conductor cross-section or with the number of cores or if there are other deviations within the type series, then the different designs have to be tested separately.

The complete cable shall meet the following fire propagation test requirements:

(al Single core cables with conductor cross sections of all sites and mufti core cables with conductor cross-sections up to and including 16mm*.

When tested according to HD 605, sub*clause 4.1.5, there shall be no visible damages on the test specimen within 300mm from its upper end. Soot changes in colour, brittleness or cracks, as well as marks from the fixing devices., are not considered to be damaged.

lb) Multi-core cables with conductor cross-sections exceeding 16mm².

When tested according to HD 405.3 the requirements for Category В shall be met.

3. СаЫ« without metallic covering

Not applicable.

3. Cables with metallic covering

   1. Code tetflnauw

1. Under consideration by TC20 I

The range of allowed combinations of conductor crocs-sectkHL number of conductors, conductor shape and conductor material is shown kt Table 5. Preferred combinations ar* shown in Table 3 for copper conductors and in Table 4 for aluminium conductors.

4,3,1 Conductor

All mutated conductors in the cable shall have the same resistance and be of the same construction. The cross-section, shape, material and number of conductors sha* be whhin the limits given in Table 6.

Copper conductors shall be annealed, round or sector shaped and with resistance and construction in accordance with HD 383, class 1 or class 2 I see Tables 3 and 51.

Aluminium conductors shall be annealed, round or sector shaped and with resistance and construction in accordance with HD 383, class 2 (see Table 4 and St

The insulation shall be polyvinyl chloride compound Type DIV 11 complying with the requirements given in Table 1 and In sub-clause 2,4 3,

The nominal thickness of the insulation shell comply with the value specified In Table 6,

To prevent moisture penetration in joints, the insulation on the plain faces of a sector shaped conductor may not curve in.

The cores in multi-core cables shall be cabled. heficafly or oscillating, with an average length of lay not more than 50 times the diameter over the cabled cores.

In mufti-core cables with round conductors an extruded covering shall be applied over the laid-up cores end substantially fill the interstices between the cores. As an alternative a lapped inner covering is permitted when the interstices are substantial fitted by separate tiHer strings.

In multi-core cables with sector shaped conductors a lapped inner covering shall be applied over the laid-up cores. As an alternative an extruded inner covering is permitted. In the latter case a hebcatty applied tape, lapped or in open helix, may be applied over the laid-up cores.

The material used for inner coverings and filters shall be suitable for the operating temperature of the cable and compatible with and not slicking to adjacent materials,

TheflominaHhicfcness of extruded inner coverings shall be in accordance with Table 7. The approximate thickness of lapped coverings shall ba ОЛтт for diameters over the laid-up cores up to and including 40mm and 0.6mm for larger diameters. The thickness of extruded or lapped inner covering need not be checked by measurement.

In trfvgJ* core cables the concentric conductor may be applied directly over the insulation - In multi-core cables the concentric conductor aha* be applied over the inner covering.

The concentric conductor shall consist of an inner layer of annealed, round or flat copper wires, applied concentricaNy on the cable core, and an outer layer with one or more spiral binder wires or tape* of copper in contact with the wire* in the inner layer.

Th* inner layer shall have an average length of lay not more than 50 lime* the diameter over the laid-up cores The average gap between individual wire* in the inner layer may not exceed 4mm,

A binder wire in th* outer layer shall have at least th* same cross-section as a wire in the inner layer. A binder tape shall have a thickness of at least 0.1 mm and * width of at least 10mm, The length of lay shal be:

for binder tape not mor* than 20 times, and

for binder wire not more than 50 times

the diameter over the laid-up cores.

The cross-section of tha concentric conductor shall be as specified in ТаЫ* 8. The electrical resistance shall be as specified in HD 383 for a Claes 2 copper conductor of the same cross section. For cross-sections not specified in HD 383 the resistance values are given in ТаЫ* 9.

The oversheath shal be an extruded layer of black polyvinyl chloride compound Type DMV19 complying with The requirements in Table 1 -

The nomr*l thickness of the sheath shaN comply with the value specified in Tables 3 and 4. For cables not specified In Tables 3 and 4, th* nominal thickness of the sheath shall be calculated by the following formula:

t, - 0 035 0 + 1 0mm

where О is the fictitious diameter immedotely under the sheath, calculated according to the method given in IEC 502, Appendix A, The value of the sheath thickness, resulting from the formula, shall be rounded off io ths nearest 0.1 mm according to the method given in IEC 502, Appendix B.

The average thickness of th* sheath, rounded to 0.1mm, shal not be less than the specified nommel value. The thickness at any place may, however, b* les* than the specified nominal value provided that the difference does not exceed 0.1mm + 16% of the spedhed nominal value.

4.4 Tests

Compliance with the requirements of clause 4,3 of this section and th* general requirements of Pan 1 shall be checked by mspectiori and by the lest* specified in Table 2.T^e_V-Be<m²remami for tfitnotwlertricte mt for Polyvinyl CMorlda

TABLE 1 (continued)