BS 4553-3:1998:2005 Edition

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Specification for 600/1000 V single-phase split concentric electric cables – Cables having thermosetting insulation and low emission of smoke and corrosive gases when affected by fire

Published By	Publication Date	Number of Pages
BSI	2005	22

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Categories: 29.060.20 - Cables, BSI

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Description

This British Standard specifies requirements for construction and describes methods of test for XLPE-insulated single-phase split concentric cables for operation on an earthed neutral system at nominal voltages up to and including 1 000 V between phases and 600 V to earth and which, when assessed by the specified tests, produce lower levels of smoke and corrosive products under exposure to fire, compared with corresponding cables conforming to BS 4553-1 and BS 4553-2.

In this standard, the level of corrosive (and acid) gases is determined by measurement of hydrochloric acid (HCl) in accordance with BS EN 50267-2-1 .

The cables specified in this part of BS 4553 have a central phase conductor insulated with XLPE and a concentric layer comprising bare copper wires (earth continuity conductor) and copper wires covered with extruded polymer (neutral conductor). The cables are intended for use in fixed installations in industrial areas, buildings and similar applications. They are suitable for use in situations where the combination of ambient temperature and temperature rise due to loading current results in a conductor temperature not exceeding 90 °C and for a maximum short-circuit conductor temperature of 250 °C.

NOTE 1 Limitation on the temperature of the cables may be imposed in situations where they may be touched.

NOTE 2 Due to the relatively high conductor temperature, there is a risk of drying out the surrounding soil causing an increase in thermal resistivity which in turn would lead to the cable temperature rising to a higher value than anticipated. For cable laid directly in the ground, a suitable de-rating factor should be applied or a lower maximum sustained conductor operating temperature should be assumed to take into account the possible effects of soil drying out.

NOTE 3 In installations which include cable joints and terminations, the performance of these accessories should be taken into account in deciding the maximum operating temperature of the cable.

Guidance concerning selection, installation and usage is given in Annex A, Annex B and Annex J respectively.

When assessed by specified tests, these cables produce lower levels of smoke and corrosive products under exposure to fire, compared with corresponding cables conforming to BS 4553-1 and BS 4553-2.

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 Definitions rated voltage U rated voltage U maximum voltage U nominal value approximate value type tests (symbol T) sample tests (symbol S) routine tests (symbol R)
7	tests after installation 4 Voltage designation 5 Phase conductor 6 Insulation 6.1 General 6.2 Thickness of insulation 6.3 Spark testing of insulation 6.4 Corrosive and acid gas emission of insulation and protective barrier 7 Identification of phase core 7.1 General 7.2 Clarity and durability
8	8 Bedding 8.1 General 8.2 Corrosive and acid gas emission of bedding and tape 9 Concentric layer 9.1 Neutral conductor 9.2 Earth continuity conductor 9.3 String separators 9.4 Application of concentric layer 9.5 Corrosive and acid gas emission of neutral conductor covering and string separators 10 Binders 10.1 General 10.2 Corrosive and acid gas emission of binder tapes
9	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 External marking
10	12.2 Identification of year of manufacture 12.3 The mark of an approval organization 12.4 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
11	16.3 Voltage tests on completed cables Schedule of tests
12	17 Sample tests 17.1 General 17.2 Flame propagation on single cable 17.3 Smoke emission 18 Type tests 18.1 General 18.2 Compatibility 18.3 Shrinkage of insulation 18.4 Flame propagation on multiple cables Compatibility requirements
13	600/1 000 V XLPE-insulated single-phase split concentric cables with stranded copper phase conductors 600/1 000 V XLPE-insulated single-phase split concentric cables with solid aluminium phase conductors
14	(informative) Recommendations for the selection and operation of cables (informative) Recommendations for the selection and operation of cables General Voltage rating Current rating
15	(informative) Recommendations for installation of cables (informative) Recommendations for installation of cables General Minimum temperature during installation Minimum installation radius Prevention of moisture ingress Compound filling Tests after installation
16	(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) Voltage tests on completed cables (normative) Voltage tests on completed cables (Spare) (Spare)
17	(normative) Compatibility test (normative) Compatibility test General Test method (informative) Notes on type tests (informative) Notes on type tests General Sample selection for type tests Type tests Compatibility test Shrinkage test on insulation Corrosive and acid gas test Test for flame propagation
18	Smoke emission test 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. 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/application Reasonable protection, appropriate to the choice of cable and the installation conditions, should be provided against mechanical damage. Spare. Cables may be harmed by exposure to corrosive products or solvent substances, especially petroleum based chemicals or their vapours.
19	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 thermal 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, reference should be made to the cable manufacturer for a duct size corresponding to the current rating quoted. 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. 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 the drums or their becoming a hazard to the general public. The cable manufacturer should be consulted for detailed guidance as to the safe handling of cable drums. Scrap cable incineration

Additional information

Status	Confirmed
Pages	22
Publication Date	2005-04-29
ISBN	0 580 29576 1
Standard Number	BS 4553-3:1998
Title	Specification for 600/1000 V single-phase split concentric electric cables – Cables having thermosetting insulation and low emission of smoke and corrosive gases when affected by fire
Replaces	BS 4553:1992
Descriptors	Thermosetting polymers, Electrical insulation, Type testing, Diameter, Selection, Identification methods, Shrinkage, Split concentric cables, Corrosive materials, Cross-linked materials, Neutral conductors, Grades (quality), Single-phase current, Thickness, Installation, Spark testing, Earth conductors, Electric conductors, Visual inspection (testing), Elongation at fracture, Seals, Seatings, Temperature, Fire tests, Designations, Testing conditions, Sheathed cables, Copper, Instructions for use, Marking, Stranded conductors, Working range, Area, Insulated cables, Sheathed conductors, Compatibility, Test specimens, Smoke control, Approval marks, Voltage, Polyethylene, Thickness measurement, Aluminium, Rated voltage, Colour codes, Fire safety, Tensile strength, Electric cables, Electrical testing
Publisher	BSI
Committee	GEL/20/17
Amends	BS 4553-3:1998
ICS Codes	29.060.20 - Cables

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