BS 7889:1997:2005 Edition
$102.76
Electric cables. Thermosetting insulated, unarmoured cables for a voltage of 600/1000 V
| Published By | Publication Date | Number of Pages |
| BSI | 2005 | 20 |
Construction and methods of test for unarmoured, single-core thermosetting insulated cables of rated voltage 600/1000 V; for use in fixed installations in industrial areas, buildings and similar applications, but not for direct burial in the ground.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British Standard |
| 3 | Contents |
| 5 | 1 Scope 2 Normative references |
| 6 | 3 Terms and definitions rated voltage U0 rated voltage U maximum voltage Um nominal value approximate value type tests (symbol T) sample tests (symbol S) routine tests (symbol R) tests after installation 4 Voltage designation |
| 7 | 5 Conductors 6 Insulation 6.1 General 6.2 Thickness of insulation 6.3 Spark testing of insulation 7 Identification of cores 7.1 General 7.2 Spare 7.3 Clarity and durability 8 Oversheath 8.1 General 8.2 Thickness of oversheath |
| 8 | 9 Cable marking 9.1 External marking 9.2 Identification of year of manufacture 9.3 The mark of an approval organization 9.4 Additional marking |
| 9 | 10 End sealing 11 Schedule of tests 12 Test conditions 12.1 Ambient temperature 12.2 Frequency and waveform of power frequency test voltages Schedule of tests |
| 10 | 13 Routine tests 13.1 General 13.2 Conductor resistance 13.3 Voltage test on completed cables 14 Sample tests 14.1 General 14.2 Flame propagation on single cable 15 Type tests 15.1 General 15.2 Compatibility 15.3 Shrinkage of insulation Compatibility test requirements |
| 11 | Single-core 600/1 000 V cables with circular stranded copper conductor Single-core 600/1 000 V cables with solid aluminium conductor |
| 12 | (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 Spare Current ratings |
| 13 | (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 Test after installation |
| 14 | (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 |
| 15 | (normative) Voltage test on completed cables (normative) Voltage test on completed cables Method Spark test voltages (normative) Compatibility test (normative) Compatibility test General Test method |
| 16 | (informative) Notes on type tests (informative) Notes on type tests General Sample selection for type tests Type tests Compatibility test Shrinkage test on insulation Change of material Evidence of type testing |
| 17 | (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. A.2 classifies the voltage ratings of cables manufactured in accordance with this specification. These cables are intended for use within a nominal power frequency range of 49 Hz to 61 Hz. 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. #Text deleted$ Environment and application Reasonable protection against mechanical damage, appropriate to the choice of cable and the installation conditions, should be provided. Cables specified in this British Standard contain PVC, and when exposed to the effects of external fire will produce harmful smo… Cables may be harmed by exposure to corrosive products or solvent substances, especially petroleum based chemicals or their vapours. 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, 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. |
| 18 | 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 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. 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 |
