BS EN 60423-1995 Conduits for electrical purposes - outside diameters of conduits for electrical installations and threads for conduits and fittings.pdf

BRITISH STANDARD BS EN 60423:1995 Conduits for electrical purposes Outside diameters of conduits for electrical installations and threads for conduits and fittings The European Standard EN 60423:1994 has the status of a British Standard UDC 621.315.671:696.6:621.882.082.1 Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI BS EN 60423:1995 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1995 © BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PEL/113 Draft for comment 90/34700 DC ISBN 0 580 24021 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PEL/113, Cable management, upon which the following bodies were represented: ASTA Certification Services British Electrical Systems Association (BEAMA Ltd.) British Telecommunications plc Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Gland Manufacturers Technical Committee Institution of Electrical Engineers Institution of Incorporated Engineers Amendments issued since publication Amd. No.DateComments Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI BS EN 60423:1995 © BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60423 3 National annex NA (informative) Original IEC text amended by CENELEC common modifications 14 List of referencesInside back cover Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI BS EN 60423:1995 ii © BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee PEL/113 and is the English language version of EN 60423:1994 Conduits for electrical purposes Outside diameters of conduits for electrical installations and threads for conduits and fittings published by the European Committee for Electrotechnical Standardization (CENELEC). It is derived by CENELEC from IEC 423:1993 published by International Electrotechnical Commission (IEC). The CENELEC common modifications have been implemented at the appropriate places in the text and are indicated by a sideline in the margin. The original IEC text that has been modified by CENELEC is quoted in National annex NA. The foreword of the European Standard makes reference to the “ date of withdrawal” , dow, of the relevant national standard. In this case the relevant national standard is BS 6053:1981 which will be withdrawn on 1995-07-01. Certificates and marks will not be awarded after this date with respect to the withdrawn British Standard. However such certificates and marks, already awarded, may continue to apply to production until 2000-07-01. The introduction refers to IEC 614-2 and IEC 1035-2 as being helpful in determining the material and wall thickness. IEC 614-2 is identical with the following British Standard: BS 6099 Conduits for electrical installations Part 2: Particular specifications Section 2.2:1982 Specification for rigid plain conduits of insulating material Additional information. The graphic signs, symbols and letters used in this standard can be found in the following British Standards: BS 3939 Graphic symbols for electrical power, telecommunications and electronics diagrams Part 1:1986 General information, general index (related to IEC 617-1) Part 1:1985 Symbol elements, qualifying symbols and other symbols having general application (identical with IEC 617-2) 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, the EN title page, pages 2 to 14, an inside back cover 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. Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI ? EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 60423 November 1994 UDC 621.315.671:696.6:621.882.082.1 ICS 29.120.10 Supersedes HD 393 S1:1979 Descriptors: Electrical installation, electric conduit, equipment specification, diameter, screw thread English version Conduits for electrical purposes Outside diameters of conduits for electrical installations and threads for conduits and fittings (IEC 423:1993, modified) Conduits de protection des conducteurs Diamètres extérieurs des conduits pour installations électriques et filetages pour conduits et accessoires (CEI 423:1993, modified) Elektroinstallationsrohre Außendurchmesser von Elektroinstallationsrohren und Gewinde für Elektroinstallationsrohre und deren Zubehör (IEC 423:1993, modifiziert) This European Standard was approved by CENELEC on 1994-10-04. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1994 Copyright reserved to CENELEC members Ref. No. EN 60423:1994 E Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI ? EN 60423:1994 © BSI 07-1999 2 Foreword The text of the International Standard IEC 423:1993, prepared by Subcommittee 23A, Conduits for electrical purposes, of IEC Technical Committee 23, Electrical accessories, together with the common modifications prepared by Technical Committee CENELEC TC 113, Cable management, was submitted to the Unique Acceptance Procedure and approved by CENELEC as EN 60423 on 4 October 1994. This European Standard supersedes HD 393 S1:1979. The folowing dates were fixed. For products which have complied with HD 393 S1:1979 before 1995-07-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 2000-07-01. Annexes designated “ normative” are part of the body of the standard. In this standard, Annex ZA which has been added by CENELEC, is normative. Contents Page Foreword 2 Introduction 3 1 Scope3 2 Normative references3 3 Outside diameters and threads 3 4 Gauges3 5 Samples of conduit 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications 13 Figure 1 Basic profile of screw threads 7 Figure 2 Gauges for checking maximum outside diameters of conduits 8 Figure 3a Gauges for checking minimum outside diameters of rigid metallic conduits 9 Figure 3b Gauges for checking minimum outside diameters of conduits other than rigid metallic 10 Figure 4 Go/No Go gauge for external threads 11 Figure 5 Go/No Go gauge for internal threads 12 Table 1 Outside diameters for conduits and thread details for conduits and associated fittings 4 Table 2 Dimensions of gauges for external threads 5 Table 3 Dimensions for gauges for internal threads 6 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1995-07-01 latest date by which national standards conflicting with the EN have to be withdrawn(dow) 1995-07-01 Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI ? EN 60423:1994 © BSI 07-19993 Introduction The mechanical performance of the threadable parts of the conduit system will be a function of material and wall thickness which is specified in the appropriate product standard (IEC 1035-2 or IEC 614-2). 1 Scope This International Standard specifies outside diameters for conduits used in electrical installations and the dimensional requirements for threads. It also specifies the dimensional requirements for threads used in associated fittings. It is not applicable to extra-heavy duty rigid steel conduits specified in IEC 981. 2 Normative references NOTENormative references to international publications are listed in Annex ZA (normative). 3 Outside diameters and threads The outside diameters, tolerances and details of external and internal metric threads are given in Table 1. Details of the thread form are given in Figure 1, which is based on ISO 68. 4 Gauges Details of gauges for checking the maximum outside diameter of conduits are given in Figure 2. For the minimum outside diameters of conduits, details are given in Figure 3a and Figure 3b. The dimensions of gauges for checking external threads are given in Table 2, and these are in accordance with ISO 1502. The types of gauges are shown in Figure 4. The dimensions of gauges for checking internal threads are given in Table 3, and these are in accordance with ISO 1502. The types of gauges are shown in Figure 5. 5 Samples of conduit The samples shall be approximately 500 mm in length. Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI ? EN 60423:1994 4 © BSI 07-1999 Table 1 Outside diameters for conduits and thread details for conduits and associated fittings Outside diameters and thread for conduitsExternal threadsInternal threads Outside diameters Metric threads Class of fit Pitch Major diameter (d) Effective diameter (d2) Minor diameter (d1) Minor diameter (D) Effective diameter (D2) Minor diameter (D1) max.min.max.min.max.min.min.max.min.max.min. 6 + 0/ 0,1 8 + 0/ 0,2 10 + 0/ 0,2 12 + 0/ 0,3 16 + 0/ 0,3 20 + 0/ 0,3 25 + 0/ 0,4 32 + 0/ 0,4 40 + 0/ 0,4 50 + 0/ 0,5 63 + 0/ 0,6 75 + 0/ 0,6 M6 M8 M10 M12 M16 M20 M25 M32 M40 M50 M63 M75 6 g/6 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 8 g/7 H 0,75 1,00 1,00 1,50 1,50 1,50 1,50 1,50 1,50 1,50 1,50 1,50 5,978 7,974 9,974 11,968 15,968 19,968 24,968 31,968 39,968 49,968 62,968 74,968 5,838 7,694 9,694 11,593 15,593 19,593 24,593 31,593 39,593 49,593 62,593 74,593 5,491 7,324 9,324 10,994 14,994 18,994 23,994 30,994 38,994 48,994 61,994 73,994 5,391 7,144 9,144 10,770 14,770 18,770 23,758 30,758 38,758 48,744 61,744 73,744 5,058 6,747 8,747 10,128 14,128 18,128 23,128 30,128 38,128 48,128 61,128 73,128 4,929 6,528 8,528 9,846 13,846 17,846 22,834 29,834 37,834 47,820 60,820 72,820 6,000 8,000 10,000 12,000 16,000 20,000 25,000 32,000 40,000 50,000 63,000 75,000 5,645 7,540 9,540 11,262 15,262 19,262 24,276 31,276 39,276 49,291 62,291 74,291 5,513 7,350 9,350 11,026 15,026 19,026 24,026 31,026 39,026 49,026 62,026 74,026 5,378 7,217 9,217 10,751 14,751 18,751 23,751 30,751 38,751 48,751 61,751 73,751 5,188 6,917 8,917 10,376 14,376 18,376 23,376 30,376 38,376 48,376 61,376 73,376 NOTE 1All dimensions in millimetres. NOTE 2See also Figure 1. NOTE 3Dimensions 50, 63 and 75 mm: for threadable conduits tolerances on outside diameters are reduced to (+ 0/0,04) in each case. Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI ? EN 60423:1994 © BSI 07-19995 Table 2 Dimensions of gauges for external threads Threaded gaugePlain gauge Designation of gauge Major diameter Pitch diameter Tolerance on pitch diameter Admissible wear for pitch diameter Minor diameter Tolerance on minor diameter Manufacturing tolerances Diameter of hole for plain gauge Tolerance on diameter of hole for plain gauge Overall diameter of gauge Thickness of gauge Pitch over 10 threads Half-angle of screw thread d min mmmm ± mmmm d1 mm ± mm ± mm ± minutes DA mm ± mm DB mm b mm M6 M8 M10 M12 M16 M20 M25 M32 M40 M50 M63 M75 6,041 8,057 10,057 12,090 16,090 20,090 25,090 32,090 40,090 50,090 63,090 75,090 5,489 7,316 9,316 10,982 14,982 18,982 23,982 30,982 38,982 48,982 61,982 73,982 0,007 0,009 0,009 0,012 0,012 0,012 0,012 0,012 0,012 0,012 0,012 0,012 + 0,016 + 0,021 + 0,021 + 0,0255 + 0,0255 + 0,0255 + 0,0255 + 0,0255 + 0,0255 + 0,0255 + 0,0255 + 0,0255 5,166 6,891 8,891 10,344 14,344 18,344 23,344 30,344 38,344 48,344 61,344 73,344 0,007 0,009 0,009 0,012 0,012 0,012 0,012 0,012 0,012 0,012 0,012 0,012 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 17 15 15 12 12 12 12 12 12 12 12 12 5,838 7,694 9,694 11,593 15,593 19,593 24,593 31,593 39,593 49,593 62,593 74,593 0,005 0,008 0,008 0,015 0,015 0,015 0,015 0,015 0,015 0,015 0,015 0,015 32 32 32 38 45 45 60 70 71 85 100 120 8 8 8 10 12 12 16 18 18 20 20 24 NOTEThe type of gauge is shown in Figure 4. Licensed copy:PONTYPRIDD COLLEGE, 29/11/2006, Uncontrolled Copy, © BSI ? EN 60423:1994 6 © BSI 07-1999 Table 3 Dimensions for gauges for internal threads Threaded gaugePlain gauge Overall length of threaded gauge Overall length of plain gauge Designation of gauge Major diameter Tolerance on major diameter Pitch diameter Tolerance on pitch diameter Admissible wear for pitch diameter Minor diameter Manufacturing tolerances Diameter of plug Tolerance on diameter of plug for plain gauge Pitch over 10 threads Half-angle of screw threads D mm ± mmX D2 mm ± mm mm D1 max. mm ± mm ± minutes DA mm ± mm L1 mm L2 mm M6 M8 M10 M12 M16 M20 M25 M32 M40 M50 M63 M75 6,012 8,012 10,012 12,016 16,016 20,016 25,016 32,016 40,016 50,016 63,016 75,016 0,011 0,011 0,011 0,014 0,014 0,014 0,014 0,014 0,014 0,014 0,014 0,014 5,525 7,362 9,362 11,042 15,042 19,042 24,042 31,042 39,042 49,042 62,042 74,042 0,0055 0,0055 0,0055 0,007 0,007 0,007 0,007 0,007 0,007 0,007 0,007 0,007 + 0,0125 + 0,0175 + 0,0175 + 0,021 + 0,021 + 0,021 + 0,021 + 0,021 + 0,021 + 0,021 + 0,021 + 0,021 5,080 6,773 8,773 10,160 14,160 18,160 23,160 30,160 38,160 48,160 61,160 73,160 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 0,005 17 15 15 12 12 12 12 12 12 12 12 12 5,378 7,217 9,217 11,751 14,751 18,751 23,751 30,751 38,751 48,751 61,751 73,751 0,008 0,008 0,008 0,008 0,008 0,008 0,008 0,008 0,008 0,008 0,008 0,008 6 10 10 12 14 14 14 15 15 18 18 18 6 7 7 8 10 12 14 15 15 18 18 18 NOTEThe type of gauge is shown in Figure 5. 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