---

Page 5-C-31 HD 604 S1:1994/A1:1997

Part 5 Section C

TABLE VII

GENERAL DATA FOR THE ARMOUR/PE-CONDUCTOR OF CABLES
WITH ALUMINIUM CONDUCTORS

SECTION E: CABLES WITH COPPER OR ALUMINIUM CONDUCTORS AND WIRE ARMOUR

Replace the complete Section by the following:'BLANK PAGE'

SECTION E: CABLES WITH COPPER OR ALUMINIUM CONDUCTORS AND WIRE ARMOUR

Tables: 1-26 5-E-13

A

5-E-49

ppendix: Guide to use

REFERENCES

Section E of Part 5 of HD 604 incorporates by dated or undated reference, provisions from other publications. These references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to Section E of Part 5 of HD 604 only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.

EN 60811 Tests on electric cables under fire conditions

HD 383 Conductors of insulated cables (Endorsing IEC 228 and 228A)

HD 505 Common test methods for insulating and sheathing materials of electric cables

HD 605 Electric cables : Additional test methods

HD 606 Measurement of smoke density of electric cables burning under defined conditions

IEC 183 Guide to the selection of high voltage cables

IEC 754-1 Test on gases evolved during combustion of electric cables. Part 1 : Determination of the amount of halogen acid gas evolved during the combustion of polymeric materials taken from cables

1. S

   SECTION E

   
   cope

This section specifies requirements for and dimensions of single core and multi-core cables with thermosetting insulation and non-halogenated sheath having reduced fire propagation performance and having low emission of smoke when affected by fire.

The cables considered are intended for use where the combination of ambient temperature and temperature rise due to loading current results in a conductor temperature not exceeding 90°C. The maximum temperature for short-circuit condition is 250°C.

This section covers the following classes of cable:

1. 2, 3, 4 and 5 core cables having copper conductor and steel wire armour

2. 2, 3 and 4 core cables having solid aluminium conductors and aluminium wire armour

3. Single core cables having stranded copper, stranded aluminium, solid or sectoral aluminium

conductors and aluminium wire armour

4. Multi-core auxiliary cables having stranded copper conductors, and steel wire armour

Two types of cable are covered by this Section of HD 604 - Type 1 and Type 2. The cable type should be selected which is appropriate to the application. The basis for the two types is as follows:

Type 1 - cable intended to satisfy the installation and operating conditions prevailing in a fossil-fuelled power station or equivalent location.

Type 2 - cable intended to satisfy the installation and operating conditions prevailing in a PWR power station, but excluding locations in or around the containment area.

The general construction requirements are the same for both types. However, Type 2 cables have the option of dual-layer oversheaths and, for some types, of employing Tl Z insulation with associated increase in thickness of insulation, bedding and oversheath. The more onerous type testing of Type 2 cables acknowledges the limited size range and voltage of cables currently used in certain PWR projects.

An informative guide to use is given in the appendix of this section.

2. Additional general requirements

The following general requirements shall be read in conjunction with those given in part 1.

The cores of all cables shall be identified either by numbers or by colours in accordance with the following sequence:

N

Identification

One

Two

Three

Four Five

Auxiliary cables

Red or black

Red, black

Red, yellow, blue

Red, yellow, blue, black

Red, yellow, blue, black, green/yellow

1, 2, 3, 4, 5, 6, 7, and upwards

umber of coresThe height of individual numbers shall be not less than 1.5mm and the interval between adjacent numbers shall not exceed 70mm.

The minimum thickness of extruded inner covering shall not be less than the specified value for each type and size of cable shown in the tables by an amount more than 20% + 0.2mm. Compliance shall be checked by the test given in sub-clause 2.1.2 of HD 605.

The method of cable marking shall comply with clause 3 of Part 1 and the following additional requirements: -

The external surface of all cables shall be legibly marked with the following elements of marking:-

Element Example of marking

1. Copper conductor cables: 4 x50

(Note: 4 x 50 shall indicate a 4-core cable with 50mm² copper conductors.)

2. Aluminium conductor cables: 4 x 50 AL

(Note: 4 x 50 AL shall indicate a 4-core cable with 50mm² aluminium conductors.) (iii) Copper conductor cables with reduced neutral : 3 x 50/25

(Note: 3 x 50/25 shall indicate a 4-core cable with three 50mm² copper phase conductors and one 25mm² copper neutral conductor.)

The marking of the Elements 1 -4 shall be by embossing or indenting on the oversheath or by other durable means agreed with the purchaser.

For cables with tabulated approximate overall diameters above 15mm, Elements 1, 2 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 shall appear on at least one line, which may be one of the primary lines, or a secondary line or lines. They may appear in any sequence that neither confuses nor conflicts, and need not all be on the same line.

For cables with tabulated approximate overall diameters of 15mm or smaller, the Elements shall be disposed as for cables above 15mm except that 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 3mm.

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 550mm, for Elements 1,2 and 3, and not greater than 1100mm for Elements 4 and 5.

Compliance shall be checked by visual examination and measurement.

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

If the identification's internal the distance between the end of one mark and the beginning of the next mark shall not be greater than 550 mm. As an alternative 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.

If 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 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-clauses 2.3.1 - 2.3.3.

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

Cables shall not fail during the application of the following voltages for 5 min when tested in accordance with HD 605 sub-clause 3.2.1.

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

When tested in accordance with sub-clause 3.3.2 of HD 605, the insulation resistance shall not be less than the following values for 1km at 20°C.

The sheath shall meet the requirements of sub-clause 3.6.1 of HD 605.

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-clauses 4.3.2, 4.3.4 and 4.3.6 of this Section, 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.

The armour resistance at 20°C (based on 1km length) of 3.3kV cables, when measured in accordance with sub-clause 3.1.2 of HD 605, shall not exceed the values given in tables 19-22.

When tested in accordance with HD 405.1, the sample of complete cable shall comply with the requirements of that standard.

For compatibility test, abrasion test and oversheath resistance test,

- select a cable having a tabulated diameter not exceeding 15mm, and also a cable having a tabulated diameter between 26mm and 40mm.

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.

The following samples shall be tested: