1、BRITISH STANDARDBS EN 60670-21:2007Boxes and enclosures for electrical accessories for household and similar fixed electrical installations Part 21: Particular requirements for boxes and enclosures with provision for suspension meansThe European Standard EN 60670-21:2007 has the status of a British
2、StandardICS 29.120.99g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60670-21:2007This British Standard was published under the authority of t
3、he Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 57842 7National forewordThis British Standard is the UK implementation of EN 60670-21:2007. It is identical to IEC 60670-21:2004.The UK participation in its preparation was entrusted to Technical Committee PEL/23, El
4、ectrical accessories.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot
5、confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 60670-21 NORME EUROPENNE EUROPISCHE NORM June 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee
6、 fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60670-21:2007 E ICS 29.120.99 English version Boxes and enclosures for electrical access
7、ories for household and similar fixed electrical installations - Part 21: Particular requirements for boxes and enclosures with provision for suspension means (IEC 60670-21:2004, modified) Botes et enveloppes pour appareillage lectrique pour installations lectriques fixes pour usages domestiques et
8、analogues - Partie 21: Rgles particulires concernant les botes et enveloppes avec dispositifs de suspension (CEI 60670-21:2004, modifie) Dosen und Gehuse fr elektrische Installationsgerte fr Haushalt und hnliche ortsfeste elektrische Installationen - Teil 21: Besondere Anforderungen fr Dosen und Geh
9、use mit Aufhngemitteln (IEC 60670-21:2004, modifiziert) This European Standard was approved by CENELEC on 2007-03-01. 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 witho
10、ut 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 languag
11、e 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, Bulgaria, Cyprus, the Czech Republic, Denma
12、rk, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 60670-21:2007 2 Foreword The text of the International
13、Standard IEC 60670-21:2004, prepared by SC 23B, Plugs, socket-outlets and switches, of IEC TC 23, Electrical accessories, together with the common modifications prepared by the Technical Committee CENELEC TC 23B, Switches for household and similar fixed electrical installations, was submitted to the
14、 formal vote and was approved by CENELEC as EN 60670-21 on 2007-03-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-03-01 latest date by which the national standards c
15、onflicting with the EN have to be withdrawn (dow) 2010-03-01 This European Standard shall be used in conjunction with EN 60670-1:2005. It lists the changes necessary to convert that standard into a specific standard for boxes and enclosures with provision for suspension means. When a particular subc
16、lause of Part 1 is not mentioned in this part, that sublcause applies as far as reasonable. In this document, the following print types are used: requirements proper: in roman type; test specifications: in italic type; notes: in smaller roman type. Subclauses, figures, tables or notes which are addi
17、tional to those in Part 1 are numbered starting from 101, table footnotes additional to those in Part 1 are lettered aa, bb, etc. Subclauses, figures, tables or notes which are additional to those in IEC 60670-21:2004 are prefixed Z. Annex ZB has been added by CENELEC. _ Endorsement notice The text
18、of the International Standard IEC 60670-21:2004 was approved by CENELEC as a European Standard with agreed common modifications. _ 3 EN 60670-21:2007 CONTENTS 1 Scope 4 2 Normative references .4 3 Definitions4 4 General requirements .4 5 General notes on tests4 6 Ratings 4 7 Classification5 8 Markin
19、g5 9 Dimensions 5 10 Protection against electric shock.5 11 Provision for earthing5 12 Construction.6 13 Resistance to ageing, protection against ingress of solid objects and against harmful ingress of water .6 14 Insulation resistance and electric strength.6 15 Mechanical strength .6 16 Resistance
20、to heat8 17 Creepage distances, clearances and distances through sealing compound 8 18 Resistance of insulating material to abnormal heat and to fire8 19 Resistance to tracking 8 20 Resistance to corrosion 8 21 Electromagnetic compatibility8 Annex ZB (normative) Special national conditions 11 Figure
21、 101 Examples of suspension means 9 Figure 102 Inclined ceiling test.10 EN 60670-21:2007 4 BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS Part 21: Particular requirements for boxes and enclosures with provision for suspension means 1 Scope Th
22、is clause of Part 1 is applicable with the following modification: Addition after the fourth paragraph: This standard applies to boxes and enclosures with provision for suspension means. 2 Normative references This clause of Part 1 is applicable. 3 Definitions This clause of Part 1 is applicable wit
23、h the following modification: Addition: 3.101 box for suspension means box intended to be used for suspending loads and which accepts the suspension means 3.102 suspension means means comprising any necessary components (hooks, brackets, etc.) which may be delivered with the box and enclosure or sup
24、plied separately (see Figure 101) 4 General requirements This clause of Part 1 is applicable. 5 General notes on tests This clause of Part 1 is applicable. 6 Ratings Void. 5 EN 60670-21:2007 7 Classification This clause of Part 1 is applicable with the following modification: Addition to Table 1: 7.
25、101.1 For suspension of a luminaire 7.101 The provision for suspension means:aa 7.101.2 For suspension of a ceiling fan. aa The suspension means may be provided with the box or not. 8 Marking This clause of Part 1 is applicable with the following modification: 8.1 Addition after item j): k) the mass
26、 in kg, if the test force declared by the manufacturer is greater than 250 N for boxes and enclosures classified according to 7.101.1. 9 Dimensions This clause of Part 1 is applicable. 10 Protection against electric shock This clause of Part 1 is applicable with the following addition. 10.Z101 Metal
27、 parts of suspension means inside the enclosure shall either be protected by additional insulation complying with tests made by insulating linings or insulating barriers fixed to the suspension means or to the body of the box or enclosure, or reliably connected through a low resistance connection to
28、 the earthing means complying with requirements in 11.1 when fitted as for normal use. 11 Provision for earthing This clause of Part 1 is applicable. EN 60670-21:2007 6 12 Construction This clause of Part 1 is applicable with the following modification: Addition: 12.101 Unless otherwise declared by
29、the manufacturer, screws for fixing accessories and/or covers are not considered as provision for suspension means. 13 Resistance to ageing, protection against ingress of solid objects and against harmful ingress of water This clause of Part 1 is applicable. 14 Insulation resistance and electric str
30、ength This clause of Part 1 is applicable. 15 Mechanical strength This clause of Part 1 is applicable with the following modification: Addition: 15.101 Boxes and enclosures with provision for suspension means Boxes and enclosures with provision for suspension means shall withstand the thermal and me
31、chanical stresses occurring in normal use. Boxes and enclosures with provision for suspension means according to 7.101.1 shall comply with the requirements in 15.101.1 and 15.101.2; 7.101.2 shall comply with the requirements in 15.101.3. 15.101.1 Boxes and enclosures which are intended for suspensio
32、n of loads from a ceiling shall withstand a test force of 250 N or the higher test force Y declared by the manufacturer. Compliance is checked by the following test. The specimen is fitted with a suspension means and installed as for normal use according to the manufacturers instructions, any screw
33、being tightened to two-thirds of the torque given in the relevant column of Table 4. Greater values of torque may be used if so declared by the manufacturer, when the relevant information is provided. 7 EN 60670-21:2007 The suspension means is then loaded with a weight of (250 5) N or with a weight
34、(Y 2 %) N declared by the manufacturer, whichever is the higher, for 24 h. For boxes and enclosures according to 7.1.1 and 7.1.3 the test is performed in a heating cabinet at (90 2)C. During the test, the box and the enclosure or the suspension means shall not become detached and the specimen shall
35、show no damage which leads to non-compliance with this standard. 15.101.2 Boxes and enclosures which are intended to be used in or on a wall shall withstand a test force of 100 N or the higher test force Y declared by the manufacturer. NOTE 1 This means may be screws otherwise intended for fixing a
36、part of the box, for example the cover or cover plate. NOTE 2 In the following countries there is no requirement for all suspension means to withstand 100 N: UK. Compliance is checked by inspection and by the following test. The box or the enclosure including covers and cover plates (if any) shall b
37、e installed as for normal use according to the manufacturers instructions and shall be placed in a heating cabinet, any screw being tightened to two-thirds of the torque given in the relevant column of Table 4. A force, equally distributed between each means if more than one, of (100 5) N or of (Y 2
38、 %) N declared by the manufacturer, is then applied for 24 h at (40 2)C perpendicularly to the wall. For boxes and enclosures according to 7.1.1 and 7.1.3 the test is performed at (40 2)C. During the test, the box or enclosure or the suspension means shall not become detached and the specimen shall
39、show no damage which leads to non-compliance with this standard. 15.101.3 Boxes and enclosures which are intended to support a ceiling fan shall withstand the thermal and mechanical stress occurring in normal use. During the test the box or enclosure or its supporting means shall not be pulled loose
40、 from the test structure when subjected to the following tests. One specimen shall be tested in each of the horizontal and inclined positions. A specimen shall be mounted in accordance with the manufacturers instructions to a supporting test structure so as to be tested while both in a horizontal po
41、sition and inclined 30 from the horizontal with the mounting screws perpendicular to the ceiling and the fan blades parallel to the floor (see Figure 102). A test fan having four blades with a diameter of (1 320 25) mm, weighing or ballasted to a weight of (155 5) N (corresponding to a mass of (15,8
42、 0,5) kg) or the rated load Y declared by the manufacturer, whichever is higher, shall be used for the tests. A 0,392 N (corresponding to a mass of 40 g) imbalance shall be placed at the centre of gravity of one blade, measured independently from the test fan. EN 60670-21:2007 8 The test fan shall b
43、e provided with a downrod of rigid metal pipe of a length sufficient to position the lower end of the fan blades (305 25) mm below the surface of the ceiling after mounting. The downrod shall be welded at the upper end to a 7,9 mm thick fan mounting bracket. The test fan mounting bracket shall be se
44、cured to the box or enclosure in accordance with the manufacturers instructions. Screws or nuts shall be tightened with a torque given in the relevant column in Table 4. A universal type joint mounting construction shall not be used for the test. The fan motor shall be such that the speed can be con
45、trolled. The speed of the test fan shall be adjusted to maintain a blade tip speed of 1 220 m/min (294 r/min). The blade pitch shall be reduced to a minimum. The fan shall operate continuously at the prescribed speed for (24 ) h. 10+At the end of the 24 h, one of the cover retaining screws or nuts s
46、hall be loosened two full turns and the fan shall operate as specified for an additional 24 h for each mounting condition, horizontal and inclined. This additional test is not required for constructions that employ cover retaining or fan mounting screws with captive, locking type washers or locknuts
47、. Additionally, there shall be no stripping of threads, cracking, crazing, breaking, or visible damages to the box or enclosure or its supporting means (other than bending). 16 Resistance to heat This clause of Part 1 is applicable. 17 Creepage distances, clearances and distances through sealing com
48、pound Void. 18 Resistance of insulating material to abnormal heat and to fire This clause of Part 1 is applicable. 19 Resistance to tracking This clause of Part 1 is applicable. 20 Resistance to corrosion This clause of Part 1 is applicable. 21 Electromagnetic compatibility This clause of Part 1 is
49、applicable. 9 EN 60670-21:2007 a) Box provided with provision for suspension means Example of provision for suspension means IEC 433/04 b) Suspension means IEC 434/04 c) Box and enclosure delivered with suspension means IEC 435/04 Figure 101 Examples of suspension means EN 60670-21:2007 10 305 mm30 330 mm1 2 IEC 436/04 Key 1 Box 2 Ceiling Figure 102 Inclined ceiling test _ 11 EN 60670-21:2007 Annex ZB (normative) Special nationa
