BS 4607-5

BS 4607-5: 1982

BRITISH STANDARD

Non-metallic conduits and fittings for electrical installations — Part 5: Specification for rigid conduits, fittings and components of insulating material

UDC 621.315.67:621.315.61

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

--`,,,,``-`-`,,`,,`,`,,`---

Incorporating Amendment Nos. 1 and 2

BS 4607-5:1982

Cooperating organizations The Power Electrical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee Association of Short Circuit Testing Authorities* British Electrical and Allied Manufacturers’ Association (BEAMA) British Railways Board British Steel Corporation Department of Energy (Electricity) Electrical Contractors’ Association* Electrical Contractors’ Association of Scotland Electricity Supply Industry in England and Wales Energy Industries Council Era Technology Ltd Institute of Purchasing and Supply Institution of Electrical Engineers Ministry of Defence* National Coal Board National Economic Development Office* Trades Union Congress The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard;

--`,,,,``-`-`,,`,,`,`,,`---

This British Standard, having been prepared under the direction of the Power Electrical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 26 February 1982 © BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference PEL/80 Draft for comment 80/20191 DC

Association of Manufacturers allied to the Electrical and Electronic industry (BEAMA) Association of Supervisory and Executive Engineers British Electrical Systems Association (BEAMA) Confederation of British Industry Electrical Installation Equipment Manufacturers’ Association (BEAMA) Zinc Development Association

Amendments issued since publication Amd. No.

Date of issue

4951

December 1985

5473

November 1987

Comments

Indicated by a sideline in the margin

ISBN 0 580 12622 6

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

BS 4607-5:1982

Contents

--`,,,,``-`-`,,`,,`,`,,`---

Cooperating organizations Foreword 1 Scope 2 General requirements 3 General conditions for tests 4 Classification 5 Marking 6 Construction 7 Mechanical properties of fittings and components 8 Resistance to heat 9 Resistance to burning 10 Insulating characteristics Standard sheet 1 Non-circular conduits Standard sheet 2 Moulded slip type coupler, plain Standard sheet 3 Inspection bends, plain Standard sheet 4 Inspection sleeve coupler, plain Standard sheet 5 Expansion type coupler, plain Standard sheet 6 Circular conduit fittings Standard sheet 7 Circular conduit fittings, looping Standard sheet 8 Covers for circular conduit fittings Standard sheet 9 Plain entry reducers Standard sheet 10 Extension rings Figure 1 — Impact test apparatus Figure 2 — Ball-pressure apparatus Figure 3 — Insulation test circuit diagram

i

© BSI 04-1999

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Page Inside front cover ii 1 1 1 1 1 2 2 3 3 3 4 5 5 6 7 8 9 9 10 10 11 12 12

Not for Resale

BS 4607-5:1982

Foreword

--`,,,,``-`-`,,`,,`,`,,`---

This revision of this Part of this British Standard was prepared under the direction of the Power Electrical Engineering Standards Committee and supersedes the 1973 edition which is now withdrawn. The 1973 edition applied to rigid PVC conduit, fittings and components. It specified the requirements for components not of tubular form, for example, boxes, covers and reducers. Details were also given of the requirements for rigid conduits other than those specified in Part 1, which gives the requirements for conduit fittings of tubular form, using metric dimensions, comprising bends and couplers, manufactured from PVC. The title and contents of this edition of Part 5 have been revised to include products made from any suitable insulating material. The requirements for components not of tubular form, for example, circular fittings and covers, and reducers, are specified and details are also given of the requirements for rigid conduits other than those specified in Part 1. The format of this edition follows that of those IEC Publications of similar content except that it is in the form of a “stand alone” specification and includes standard sheets giving dimensions (metric) of conduits, couplers, bends and other fittings. As well as revising existing clauses in the 1973 edition a new clause has been added covering insulating characteristics. Other Parts of this standard are: — Part 1:1970 Rigid PVC conduits and conduit fittings. Metric units; — Part 2:1970 Rigid PVC conduits and conduit fittings. Imperial units; — Part 3:1971 Pliable corrugated, plain and reinforced conduits of self extinguishing plastics material. NOTE

A further Part, Part 4, is under consideration.

A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 12 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. © BSI 04-1999

ii

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

BS 4607-5:1982

1 Scope This Part of this British Standard specifies requirements for components not of tubular form, for example circular fittings and covers, and reducers. Details are also given of the requirements for rigid conduits other than those specified in Part 1.

2 General requirements 2.1 Conduit, fittings and components shall be so designed and constructed that they ensure reliable mechanical protection to the cables contained therein, and they shall withstand the stresses likely to occur during transport, storage and installation. Compliance with the requirements of the standard shall be checked by carrying out all the tests specified. 2.2 There are no requirements for dimensions of conduit fittings and components. NOTE Preferred dimensions for different sizes of conduit fittings and components are given in the standard sheets as listed below. Non-circular conduits sheet 1 Moulded slip type coupler, plain

sheet 2

Inspection bends, plain

sheet 3

Inspection sleeve coupler, plain

sheet 4

Expansion type coupler, plain

sheet 5

Circular conduit fittings

sheet 6

Circular conduit fittings, looping

sheet 7

Covers for circular conduit fittings

sheet 8

Plain entry reducers

sheet 9

Extension rings Compliance is checked by measurement.

sheet 10

3 General conditions for tests

NOTE The applicant, when submitting the first set of samples, may also submit the additional set of samples of fittings or components that may be wanted should one sample fail. The testing station will then, without further request, test the additional samples and will only reject if a further failure occurs. If the additional set of samples of conduit, fittings or components is not submitted at the same time, a failure of one sample will entail a rejection by the testing station.

4 Classification

--`,,,,``-`-`,,`,,`,`,,`---

3.1 The tests shall be carried out at an ambient temperature of 20 ± 5 °C. 3.2 Each test shall be made on three fresh samples. 3.3 If more than one sample fails in any one of the tests, conduits, fittings and components shall be deemed not to comply with the requirements of this standard. If one sample fails in a test, that test and those preceding, which may have influenced the result of that test, shall be repeated on another set of samples of the number specified in 3.2, all of which shall then satisfy the requirements of the repeated tests.

Rigid conduit and fittings complying with this standard are suitable for installation, storage or transport at temperatures not normally below – 5 °C. Fittings and components in accordance with standard sheets 1, 2, 3, 4, 5, 8 and 9 are suitable for use at a temperature of up to 60 °C and shall be classified according to their maximum working temperature. Fittings in accordance with standard sheets 6, 7 and 10 shall be classified according to their maximum working temperature and suspended load as assigned by the manufacturer. NOTE Suggested classifications for test working levels are 3 kg, 5 kg and 10 kg at 60 °C, 90 °C and 120 °C.

5 Marking Conduit, fittings and components shall be marked with the maker’s name or trade mark. Fittings in accordance with standard sheets 6, 7 and 10 shall also be marked with a classification code giving the maximum working temperature in degrees Celsius, and the suspended load in kilograms. Example, 60/3 kg shows that the fitting is suitable for a maximum working temperature of 60 °C, and a suspended load of 3 kg. Marking shall be indelible and easily legible.

1

© BSI 04-1999

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

BS 4607-5:1982

Marking shall be checked by inspection and by rubbing the marking by hand for 15 s with a piece of cloth soaked with water and again for 15 s with a piece of cloth soaked in petroleum spirit. NOTE 1 Marking may be applied by stamping, printing, paper stickers or water transfers. NOTE 2 Except for fittings in accordance with standard sheets 6, 7,and 10, the marking may be applied to the inside or to the outside of the fitting or component. Where marking of the fitting or component is not practicable, the marking may be applied to the package.

6.1 Conduit, fittings and components shall be made of insulating material. Compliance shall be checked by inspection and by the tests given in clauses 7, 8, 9 and 10. 6.2 The interior and ends of conduits, fittings and components shall be smooth and free from burrs. Compliance shall be checked by inspection. 6.3 Conduit entries of fittings and components shall be so designed that a reliable joint can be made between the appropriate circular conduit and the fitting or components. 6.4 Screws used for attaching components or covers to conduit fittings shall not cause damage to cable insulation. NOTE

Conformity with the details of the relevant standard sheets ensures compliance with the requirements of 6.3 and 6.4.

6.5 The lugs and fixing threads of fittings detailed in standard sheets 6, 7 and 10 shall have adequate mechanical strength. Fixing threads of these fittings shall have a minimum threaded length of 8 mm in the plastics material. Metal inserts, when provided, shall have sufficient thickness to allow a threaded engagement of not less than three full threads. Compliance shall be checked by the tests described in 7.2.

7 Mechanical properties of fittings and components 7.1 Requirement. The thread shall remain in serviceable condition. Compliance shall be checked by the tests specified in 7.2 and 7.3. 7.2 Suspended load test. Place a rigid metal plate across the front of the fittings or components with a clearance of 2.5 mm min between the entire top face of the lug and the rear of the plate. Insert an M4 screw through the plate for the specified minimum engagement and tighten it, once only, with a minimum torque of 0.4 N m. Mount fittings specified in standard sheets 6, 7 and 10 in an oven using at least two screws. Assemble a suitable plate, having dimensions equal to the outside dimensions of the fitting, to the front of the fitting. Suspend a load of mass 3 kg centrally from the plate. Switch on the oven and maintain the temperature at the classification temperature for a period of 48 h. At the end of this period there shall be no appreciable distortion of the fitting. Maintain the temperature of the oven at this value for a further 48 h. At the end of this period, ensure that the load is still supported. Any distortion of the fitting shall be ignored. 7.3 Safety on impact test 7.3.1 Test the fittings and components other than those of non-circular conduit using the apparatus shown in Figure 1. The pendulum consists of a steel tube suspended in such a way that it swings only in a vertical plane. A hammer of mass 0.15 kg is rigidly fixed to the lower end with its axis 1 m from the axis of suspension. The striking element is a hemispherical face made of hard wood (hornbeam or European ash) and having a radius of 10 mm. The design of the apparatus is such that a force between 1.9 N and 2.0 N has to be applied to the face of the hammer to maintain the pendulum in a horizontal position. 7.3.2 The support for the sample is a sheet of plywood 8 mm thick and 240 mm square without any metallic backplate. The apparatus is fixed to a solid wall of brick, stone, concrete or the like. 7.3.3 The support of the sample is such that the sample can be placed so that the point of impact lies in the vertical plane containing the suspension axis of the pendulum. The sample can be turned about an axis perpendicular to the support and also about a vertical axis; the sample can be moved horizontally and vertically. 7.3.4 Mount the fittings and components on the support which is described in 7.3.2.

© BSI 04-1999

2

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

--`,,,,``-`-`,,`,,`,`,,`---

6 Construction

BS 4607-5:1982

--`,,,,``-`-`,,`,,`,`,,`---

7.3.5 Place the sample so that the point of impact lies in the vertical plane containing the suspension axis of the pendulum. For all tests, drop the hammer from a height of 150 mm measured vertically between the point of impact on the sample and the face of the hammer at the point of release. Apply ten blows to points evenly distributed over the sample. For circular fittings ensure that none of the blows are applied within 5 mm of any knockout. 7.3.6 A sample shall be deemed to comply with the requirements of this test even though, during the test, cracks may appear and small pieces may become detached, provided that: a) for circular fittings and inspection fittings, the detachment of such pieces does not permit any access to the interior of the fitting and the cover can be removed and replaced; b) for couplers and reducers, the protection of the cable is not impaired.

8 Resistance to heat

8.1 Requirement. Conduits, fittings and components shall be resistant to heat. Compliance shall be checked by the ball pressure test specified in 8.2. The diameter of the impression made by the steel ball shall not exceed 2 mm. 8.2 Ball-pressure test. Use the apparatus shown in Figure 2. Prepare a suitable sample from three like fittings or components. Place one sample so prepared in the horizontal position on a steel support, as shown in Figure 2, the support and the sample being placed in a heating cabinet at a temperature equal to the classification temperature. As soon as the support and the sample have attained the temperature specified, press a steel ball of 5 mm diameter against the inner surface of the sample by a force of 20 N. After 1 h, remove the ball and take the sample out of the heating cabinet. When the sample has attained room temperature, measure the diameter of the impression made by the ball.

9 Resistance to burning 9.1 Requirement. Conduits, fittings and components shall be self-extinguishing. Compliance shall be checked by the test specified in 9.2. If the sample burns, it shall do so slowly and the burning shall not spread appreciably; any flame shall have died out in less than 30 s after removal of the burner. 9.2 Test 9.2.1 General. The test shall be made on three samples in still air with a Bunsen burner, having a nozzle with an internal diameter of 9 mm. The gas used for the test shall be such that with the dimension of the flame specified in 9.2.2, the energy produced by the burner is 900 ± 30 W. 9.2.2 Procedure. While the burner is in the vertical position, adjust the flame so that its overall length is 100 mm and the length of the inner blue cone is 50 mm. Then support the burner so that its axis is at an angle of 45° to the vertical. Hold the sample vertically in such a position that the tip of the inner cone of the flame touches the surface of the sample at a distance of approximately 100 mm from its lower end. Hold the sample in the flame for 1 min.

10 Insulating characteristics 10.1 Requirements. Conduit and fittings shall have an adequate electrical insulating strength and insulation resistance. Compliance shall be checked for the conduit by the tests specified in 10.2 and 10.3, and for the fittings by the tests specified in 10.4 and 10.5. No breakdown shall occur during the tests. After the tests of 10.3 and 10.5 the insulation resistance of fittings shall be not less than 100 M7. 10.2 Electrical insulating strength test for conduit. NOTE

The ends of the samples are provided with at least 10 mm of conductive coating.

Bend and immerse the samples over a length of 1 m in water at a temperature of 20 ± 5 °C, keeping a length of approximately 100 mm at each end above the water level. Pour water into the sample until the levels inside and outside are approximately the same, and immerse an electrode in water inside the sample, and also in the water outside. The test arrangement is illustrated in Figure 3. After 24 h apply a voltage of 2 000 V, of substantially sine-wave form and having a frequency of 50 Hz, for 15 min between the electrodes.

3

© BSI 04-1999

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

BS 4607-5:1982

10.3 Insulation resistance test for conduit. After carrying out the test specified in 10.2 immerse the samples, as described in 10.2, in water maintained at a temperature of 60 ± 2 °C and again place the electrodes in position. After 2h determine the insulation resistance of each sample by applying a d.c. voltage of approximately 500 V between the electrodes, the conductive coatings being also connected to the voltage source but not included in the measuring circuit. Make the measurement 1 min after application of the voltage. 10.4 Electrical insulating strength test for fittings. Fit all covers in the manner prescribed by the manufacturer, except that the screws shall be of insulating material. Close all conduit entries except one with a plug of an insulating material. One of the plugs shall allow two separate cables to penetrate 25 mm inside the sample, 12.5 mm of the cables within the sample being without insulation, the ends of the cables being spread so that there is a distance of 12.5 mm between them. Fill the inside of the sample with spheroidal metal objects of a maximum size of 2.5 mm, and close the remaining entry. Place the sample in a container completely enclosing it by spheroidal metal objects of a maximum size of 2.5 mm. Check the conductivity of the metal objects within the sample by measuring the resistance between the two cables which have penetrated the sample, and measure it by applying a d.c. voltage of approximately 500 V from a current limited device (maximum current 10 mA) between them. Ensure that resistance measured is less than 10 7. Immerse an electrode in the metal objects external to the sample, and apply a voltage of 2 500 V, of substantially sine-wave form and having a frequency of 50 Hz, for 15 min between the electrode and the cables. 10.5 Insulation resistance test for fittings. Measure the insulation resistance of each sample at the classification temperature by applying a d.c. voltage of approximately 500 V between the electrode and the cables. Make the measurement 1 min after the application of the voltage.

Standard sheet 1 Non-circular conduits

--`,,,,``-`-`,,`,,`,`,,`---

All dimensions are in millimetres. NOTE 1

The material is insulating material.

Nominal size

d1

d2

13 16 20

13 16.3 22.6

    

+0 – 0.2

8.1 9.9 11.4

25 32

28.7 32.5

  

+0 – 0.25

11.4  + 0 11.4  – 0.25

    

+0 – 0.2

NOTE 2 The preferred manufacturing length is 3 m. Other size non-circular conduits are under consideration.

© BSI 04-1999

4

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

BS 4607-5:1982

Standard sheet 2 Moulded slip type coupler, plain

All dimensions are in millimetres. NOTE

The material is insulating material. L1min.

Nominal size

16 20 25 32

33.5 41.5 51.5 65.5

d3 max.

16.3 20.3 25.4 32.4

d4 max.

14.5 18.5 23.5 30.5

Standard sheet 3 Inspection bends, plain

L1 min.

Nominal size

16 20 25

57 68 81

R min.

33 42 52

L2 min.

12 14 19

G min.

1.5 1.5 2.0

16 20 25

d3 max.

16.3 20.3 25.4

d4 max.

14.5 18.5 23.5

5

© BSI 04-1999

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

L3 min. length of entry

--`,,,,``-`-`,,`,,`,`,,`---

All dimensions are in millimetres. NOTE This drawing does not purport to show constructional details. The cover is to be secured to the body by mechanical means. The material is insulting material.

Not for Resale

BS 4607-5:1982

Standard sheet 4 Inspection sleeve coupler, plain

All dimensions are in millimetres. NOTE This drawing does not purport to show constructional details. The cover is to be secured to the body by mechanical means. The material is insulating material.

L1 min.

Nominal size

--`,,,,``-`-`,,`,,`,`,,`---

16 20 25 32

127 140 165 228

L2 min.

12 14 19 25

L3 min. length of entry

16 20 25 32

L4 min.

76 82 95 146

16.3 20.3 25.4 32.4

d4 max.

14.5 18.5 23.5 30.5

© BSI 04-1999

6

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

d3 max.

Not for Resale

BS 4607-5:1982

Standard sheet 5 Expansion type coupler, plain

All dimensions are in millimetres. NOTE

The material is insulating material. L1 min.

Nominal size

16 20 25 32

© BSI 04-1999

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

88 101 114 127

L3 min. length of entry

16 20 25 32

d3 max.

16.3 20.3 25.4 32.4

d4 max.

14.5 18.5 23.5 30.5

7

--`,,,,``-`-`,,`,,`,`,,`---

Not for Resale

BS 4607-5:1982

Standard sheet 6

--`,,,,``-`-`,,`,,`,`,,`---

Circular conduit fittings

All dimensions are in millimetres. NOTE

This drawing does not purport to show constructional details. The material is insulating material. L1 min.

Nominal size

16 20 25

28.6 28.6 31.8

L2 min.

14.5 14.5 15.9

L3 min. length of entry

16 20 25

16.3 20.3 25.4

d4 max.

14.5 18.5 23.5 © BSI 04-1999

8

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

d3 max.

Not for Resale

BS 4607-5:1982

Standard sheet 7 Circular conduit fittings, looping

All dimensions are in millimetres. NOTE

This drawing does not purport to show constructional details. The material is insulating material.

Standard sheet 8 Covers for circular conduit fittings

All dimensions are in millimetres. NOTE

This drawing does not purport to show constructional details. The material is insulating material. F min.

type of cover

Standard Overlapping

65 85

--`,,,,``-`-`,,`,,`,`,,`---

9

© BSI 04-1999 Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

BS 4607-5:1982

Standard sheet 9 Plain entry reducers

All dimensions are in millimetres. NOTE

The material is insulating material. L1 min.

Nominal size

20 25 32 32

16 20 25 20

20 25 32 32

L2 min.

16 20 25 20

d1

20 25 32 32

+ 0.0 – 0.3 + 0.0 – 0.4

d3 max.

16.3 20.3 25.4 20.3

d4 max.

14.5 18.5 23.5 18.5

Standard sheet 10 Extension rings

All dimensions are in millimetres. NOTE

This drawing does not purport to show constructional details. The material is insulating material. L2 min.

L1 nominal size

13 20 25 32

10

8 8 8 8

--`,,,,``-`-`,,`,,`,`,,`---

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

© BSI 04-1999 Not for Resale

--`,,,,``-`-`,,`,,`,`,,`---

© BSI 04-1999

Not for Resale

BS 4607-5:1982

11

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Figure 1 — Impact test apparatus

BS 4607-5:1982

NOTE

This sketch is not intended to govern design except as regards the dimension shown. The dimension is in millimetres. --`,,,,``-`-`,,`,,`,`,,`---

Figure 2 — Ball-pressure apparatus

NOTE

Remove sharp edges and burrs.

Figure 3 — Insulation test circuit diagram © BSI 04-1999

12

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

Not for Resale

--`,,,,``-`-`,,`,,`,`,,`---

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

blank Not for Resale

BS 4607-5:1982

BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested.

BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the internationalstandardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.

BSI 389 Chiswick High Road London W4 4AL

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS

If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070.

Not for Resale

--`,,,,``-`-`,,`,,`,`,,`---

Information on standards