BS 6724:1997+A3:2008
$189.07
Electric cables. Thermosetting insulated, armoured cables for voltages of 600/1000 V and 1900/3300 V, having low emission of smoke and corrosive gases when affected by fire
| Published By | Publication Date | Number of Pages |
| BSI | 2008 | 48 |
Construction and test methods for cables, which, in specified tests, produce less smoke and corrosive products than cables conforming to BS 5467 and BS 6346; for use in fixed installations in industrial areas, buildings and similar applications.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British Standard |
| 3 | Contents |
| 7 | 1 Scope 2 Normative references |
| 8 | 3 Terms and definitions rated voltage U rated voltage U maximum voltage U nominal value approximate value |
| 9 | type tests (symbol T) sample tests (symbol S) routine tests (symbol R) tests after installation 4 Voltage designation 5 Conductors 6 Insulation 6.1 General 6.2 Thickness of insulation 6.3 Spark testing of insulation |
| 10 | 6.4 Corrosive and acid gas emission of insulation and protective barrier 7 Identification of cores 7.1 General 7.2 Bi-colour combination 7.3 Clarity and durability 8 Laying-up 8.1 General 8.2 Corrosive and acid gas emission of binder tape(s) and fillers |
| 11 | 9 Bedding 9.1 General 9.2 Thickness of bedding 9.3 Corrosive and acid gas emission of bedding 10 Armour 10.1 General 10.2 Corrosive and acid gas emission of binder tape 10.3 Wire armour |
| 12 | Diameter of armour wire and mass of zinc coating 10.4 Joints 10.5 Armour resistance 11 Oversheath 11.1 General 11.2 Thickness of oversheath 11.3 Spark testing of oversheath 11.4 Corrosive and acid gas emission of oversheath 12 Cable marking 12.1 End marking |
| 13 | 12.2 External marking 12.3 Identification of year of manufacture 12.4 The mark of an approval organization |
| 14 | 12.5 Additional marking 13 End sealing 14 Schedule of tests 15 Test conditions 15.1 Ambient temperature 15.2 Frequency and waveform of power frequency test voltages 16 Routine tests 16.1 General 16.2 Conductor resistance 16.3 Voltage test on completed cables 17 Sample tests 17.1 General 17.2 Flame propagation on single cable |
| 15 | 17.3 Smoke emission 18 Type tests 18.1 General 18.2 Compatibility 18.3 Shrinkage of insulation 18.4 Abrasion 18.5 Flame propagation on multiple cables 18.6 Shrinkage of oversheath 18.7 Insulation resistance constant of oversheath |
| 16 | Schedule of tests |
| 17 | Compatibility requirements Single-core 600/1 000 V cables with circular stranded copper conductor |
| 18 | Single-core 600/1 000 V cables with solid aluminium conductor |
| 19 | Two-core 600/1 000 V cables with stranded copper conductors |
| 20 | Two-core 600/1 000 V cables with solid aluminium conductors |
| 21 | Three-core 600/1 000 V cables with stranded copper conductors |
| 22 | Three-core 600/1 000 V cables with solid aluminium conductors |
| 23 | Four-core 600/1 000 V cables with stranded copper conductors |
| 24 | Four-core 600/1 000 V cables with solid aluminium conductors |
| 25 | Five-core 600/1 000 V cables with stranded copper conductors Single-core 1 900/3 300 V cables with circular stranded copper conductor |
| 26 | Single-core 1 900/3 300 V cables with solid aluminium conductor |
| 27 | Three-core 1 900/3 300 V cables with stranded copper conductors |
| 28 | Three-core 1 900/3 300 V cables with solid aluminium conductors |
| 29 | 600/1 000 V armoured auxiliary cables with stranded copper conductors |
| 30 | (informative) Recommendations for the selection and operation of cables (informative) Recommendations for the selection and operation of cables General Voltage ratings Selection of cables for a.c. systems Hazardous areas |
| 31 | Current ratings Cables installed in and around buildings Other installations (informative) Recommendations for the installation of cables (informative) Recommendations for the installation of cables General Minimum temperature during installation Minimum installation radius Minimum installation radius Prevention of moisture ingress Earthing bonds and clamps |
| 32 | Compound filling Earthing of armour Test after installation Test voltages after installation |
| 33 | (informative) Information to be provided with enquiry or order (informative) Information to be provided with enquiry or order (normative) Measurement of thickness (normative) Measurement of thickness Sampling Test procedure (normative) Abrasion test (normative) Abrasion test |
| 34 | Vertical force on cable during abrasion test Abrasion test |
| 35 | (normative) Insulation resistance constant test on oversheath (normative) Insulation resistance constant test on oversheath Procedure Calculation of results (normative) Armour wire tests (normative) Armour wire tests Measurement of diameter of round wire armour Mass of zinc coating of galvanized steel wire Wrapping test for galvanized steel wire Tensile test for aluminium wires Armour resistance test |
| 36 | Temperature correction multiplication factors |
| 37 | (normative) Resistance of conductor and armour (normative) Resistance of conductor and armour Maximum resistance of conductor and armour for single-core cable having aluminium wire armour |
| 38 | Maximum resistance of conductor and armour for two-, three-, four- and five-core cables having steel wire armour |
| 39 | Maximum resistance of conductor and armour for 600/1 000 V auxiliary cables with copper conductors having steel wire armour (normative) Test for shrinkage of sheath on cable (normative) Test for shrinkage of sheath on cable General Selection of samples Preparation of test piece Procedure Evaluation of results |
| 40 | (normative) Voltage test on completed cables (normative) Voltage test on completed cables Test voltage on completed cable Spare Spare (normative) Compatibility test (normative) Compatibility test General Test method |
| 41 | (informative) Gross cross-sectional area of armour (informative) Gross cross-sectional area of armour Gross cross-sectional area of armour wires for single-core 600/1 000 V cables having aluminium wire armour |
| 42 | Gross cross-sectional area of armour wires for two-, three-, four- and five-core 600/1 000 V cables having steel wire armour Gross cross-sectional area of armour wires for 600/1 000 V auxiliary cables with copper conductors having steel wire armour |
| 43 | (informative) Notes on type tests (informative) Notes on type tests General Sample selection for type tests Type tests Compatibility test (see 18.2) Shrinkage test on insulation (see 18.3) Abrasion test (see 18.4) Corrosive and acid gas test (see Test for flame propagation (see 18.5) |
| 44 | Smoke emission test (see 17.3) Test schedule for the smoke emission test Shrinkage test on oversheath (see 18.6) Insulation resistance constant of oversheath (see 18.7) Change of material Evidence of type testing (informative) Guide to use (informative) Guide to use Aim Cable selection and design The products specified in this British Standard are intended to be used for the supply of electrical energy up to the rated voltage indicated on the cable. These cables are intended for use within a nominal power frequency range of 49 Hz to 61 Hz. |
| 45 | In addition to the current ratings, due regard should be given to: The possible effects of transient over-voltages should be recognized as they can be detrimental to cables. Environment and application Reasonable protection against mechanical damage, appropriate to the choice of cable and the installation conditions, should be provided. Spare Cables may be harmed by exposure to corrosive products or solvent substances, especially petroleum based chemicals or their vapours. Special precautions are required when cables are to be installed in areas classified as hazardous, and reference should be made to !BS EN 60079-14″. Cables specified in this British Standard are not specifically designed for use: If cables in accordance with this specification are exposed to localized heat, solar radiation or high temperature ambient conditions, or there is a possibility of higher soil resistivity, the current carrying capacity will be reduced. The standard sheathing compounds supplied on these cables do not provide protection against damage by rodents, termites etc. Loaded cables may have surface temperatures which require protection against accidental contact. Installation Precautions should be taken to avoid mechanical damage to the cables before and during installation. Exceeding the manufacturer’s recommended maximum pulling tensions may result in damage to the cable. If cables are to be installed in ducts, the correct size of duct should be used. Reference should be made to ERA Publication 69-30, Part V. The type of jointing and filling compounds employed should be chemically compatible with the cable materials. The cable support system should be such as to avoid damage or danger under normal or fault conditions. Cables specified in this British Standard are designed for fixed installations only; e.g. they are not for use as trailing or reeling cables. Repeated over-voltage testing can lead to premature failure of the cable. The selection of cable glands, accessories and any associated tools should take account of all aspects of intended use. |
| 46 | Storage and handling of drums Cable drums should be regularly inspected during storage to assess their physical condition. Battens, where applied, should not be removed from drums until the cable is about to be installed. When handling drums, reasonable precautions should be taken to avoid injury. Due regard should be paid to the weight, method and direction of rolling, lifting, protruding nails and splinters. Care should be taken to avoid deterioration of drums or their becoming a hazard to the general public. A detailed guide to the safe handling of cable drums is available from the cable manufacturer. Scrap cable – incineration |
| 47 | BS 6724:1997 |
