1、PUBLISHED DOCUMENT PD CLC/TR 50473:2007 Recommendations for dimensional co-ordination between enclosures and built-in devices for rail fixing for household and similar installations ICS 29.060.10 PD CLC/TR 50473:2007 This Published Document was published under the authority of the Standards Policy a
2、nd Strategy Committee on 29 June 2007 BSI 2007 ISBN 978 0 580 52988 7 National foreword This Published Document was published by BSI. It is the UK implementation of CLC/TR 50473:2007. It supersedes PD 6590:1996 which is withdrawn. The UK participation in its preparation was entrusted by Technical Co
3、mmittee PEL/23, Electrical accessories, to Subcommittee PEL/23/1, Circuit breakers and similar equipment for household use. 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
4、a contract. Users are responsible for its correct application. Amendments issued since publication Amd. No. Date Comments TECHNICAL REPORT CLC/TR 50473 RAPPORT TECHNIQUE TECHNISCHER BERICHT May 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electr
5、otechnique Europisches Komitee 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. CLC/TR 50473:2007 E ICS 29.060.10 Supersedes R023-001:1995Eng
6、lish version Recommendations for dimensional co-ordination between enclosures and built-in devices for rail fixing for household and similar installations This Technical Report was approved by CENELEC on 2006-01-21. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bu
7、lgaria, Cyprus, the Czech Republic, Denmark, 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. Foreword Report R
8、023-001:1995 was prepared by the Technical Committee CENELEC TC 23E, Circuit breakers and similar devices for household and similar applications. It has been drawn up on the basis of the decisions taken by TC 23E at their 9 thmeeting on 8 thand 9 thNovember 1994, where the document CLC/TC23E(Sec)38
9、and the relevant comments of the National Committees were examined. This Report was approved by CENELEC on 1995-03-06. Following BT decision D124/C048 and TC 23E advice, an updated version of R023-001:1995 was circulated for voting for conversion into a Technical Report in accordance with the Intern
10、al Regulations, Part 2, Subclause 11.4.3.3 and was approved by CENELEC as CLC/TR 50473 on 2006-01-21. This Technical Report supersedes R023-001:1995. CLC/TR 50473:2007 2 1 Scope The purpose of this report is to give recommendations of the co-ordination of dimensions between enclosures and built-in d
11、evices for rail fixing for household or similar installations by listing the principal overall and related mounting dimensions, the rated current of a single device not exceeding 125 A. Examples of these devices are: MCBs, RCDs switches, fuse-systems, indicating lamps, relays, socket- outlets, timin
12、g switches, etc. Compliance with this document does not preclude the need for compliance with other relevant specifications. This document needs not apply to type tested and partially type tested assemblies which are covered by other specifications. The means of fixing envisaged in this document are
13、 mounting rails. Other possible means of fixing may be used but are not covered by these recommendations. NOTE The only criterion chosen in this document for co-ordination of dimensions has been the geometry of the devices. When selecting the enclosure, other criteria should be taken into account, e
14、.g. the rated current of the devices. 2 Normative references EN 60715:2001, Dimensions of low-voltage switchgear and controlgear - Standardized mounting on rails for mechanical support of electrical devices in switchgear and controlgear installations (IEC 60715:1981 + A1:1995) 3 Definitions For the
15、purpose of this Technical Report the following definitions apply: 3.1 module (m) a basic single block 3.2 device a modular block that is not intended to be split into independent units 4 Mounting rails The mounting rails used shall be of the 35 mm “Top hat” type according to EN 60715 or an equivalen
16、t mounting means, obtained e.g. by moulding or pressing. NOTE Other types of mounting rails may be used but are not necessarily covered by these recommendations. Recommendations for dimensional co-ordination of devices designed to be fixed on two mounting rails are under consideration. Examples are
17、given in Annex A. 5 Dimensions of devices relevant to mounting The principal dimensions necessary to co-ordinate the built-in devices with the enclosures are given in Figure 1. CLC/TR 50473:2007 3 5.1 Width “l” The width of a device shall be l = n (m 0 5 , 0 + ) mm where n = 0,5 or 1 or 1,5 or 2 or
18、2,5 or 3 or 3,5 or 4 m = 12,5 or 17,5 mm NOTE The preferred value for future designs is m = 17,5 mm. 5.2 Height of a given device “h” h 1and h 2of a given device (see Figure 1a) need not to be equal. h 1maxor h 2max , whichever is the greater, shall be chosen from the series 45 55 75 100 125 mm. NOT
19、E 1 The maximum height (h 1+ h 2 ) must not exceed twice the values chosen. NOTE 2 The means for fixing or removing the device to and from the rail are not taken into account. 5.3 Height of front projection “d” (see Figure 1a) Up to and including a value h 1or h 2 whichever is the greater of 45 mm t
20、he height d of the front projections shall be 45 0,5 mm. For values of h 1or h 2greater than 45 mm the front projection “d” shall have one of the following values: 45 mm and 80 mm, with a tolerance of 0,5 mm. NOTE The preferred value for future designs is d = 45 mm. 5.4 Depth dimensions q 1 , q 2and
21、 q 3(see Figure 1a) The depth dimensions are given in Table 1. Table 1 Depth dimensions q 1maxmm q 2minmm q 3max bmm 55 60 70 44 a50 c92,5 70 55 57 92,5 80 64 66 100 76 84 100 aPreferred value. bWhere more than one value of q 3maxis shown for a value of q 1maxand q 2min ; the appropriate value is a
22、function of the design “family” of the device. cPreferred value of q 2min = 52 mm. CLC/TR 50473:2007 4 6 Distance Y between parallel mounting rails (see Figure 1b) The distance Y between centre lines of parallel rails shall be Y = X 25 mm where X = 4 or 5 or 6 or The tolerance shall not exceed 0,5 m
23、m for Y 125 mm (X 5) and 1,0 mm for Y 125 (X 5). For boards or panels with 3 or more rows the cumulative tolerance shall not exceed 2 mm. NOTE 1 Multiplier 4 is intended for boards or panels containing rows made up exclusively of accessories, indicator lights, fuses, etc. For rows containing switchi
24、ng devices the minimum value is 5. NOTE 2 The distance from the highest and lowest rail to the top or bottom face respectively of the board is not considered. NOTE 3 It is the responsibility of the manufacturer of the board to choose the appropriate Y-value(s). NOTE 4 In a given board values of Y di
25、fferent from each other may be used. 7 Clearances and creepage distances The clearances and creepage distances between live parts and accessible metal parts shall correspond to those given in the relevant product standards. 8 Relevant mounting dimensions (see Figure 1b) 8.1 General rules for mountin
26、g dimensions 8.1.1 The general rules for the co-ordination of overall dimensions q and related mounting dimensions p are p 1q 1 where p 147,5 mm for new designs of q 1max = 44 mm, p 2q 2where p 251 mm for new designs of q 2 52 mm, p 3q 3 where p 2applies only at the edges of the window, and p 3inclu
27、des the maximum projection of the operating means or the rim of a recess for the operating means, and is to apply to the window area only. This requirement may be disregarded in the case of devices which can only be operated by hand and circuit-breakers with trip-free release, provided that the ON a
28、nd OFF positions of the operating means, if any, lie within p 3 . CLC/TR 50473:2007 5 8.1.2 To meet the requirements for reinforced insulation the following requirements shall apply to the devices (see Figure 1a): q 1max q 03 mm for future designs (to take into account metal front barriers) and a 3
29、mm; or if a is less than or equal to 3 mm and the distance B is less than 6 mm a shoulder is needed on the device for the front barrier at a distance of (q 1max+ 3 0 5 , 0 + ) mm. The width of this shoulder shall be between 2,5 mm and 5 mm. 8.2 Window openings (see Figure 1b) The height f of the ope
30、ning for the window is obtained from the relationship: (d + 1) f (d + 2) where d is the nominal value of the height of the front projection (see 5.3). In order to obtain the degree of protection prescribed by the wiring rules appropriate measures shall be taken, e.g. use of blanking pieces. NOTE In
31、EN 60439-3 a minimum degree of protection by the enclosure of IP 2XC is required for low voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access. 8.3 Strength of front barriers and/or doors Yielding of front barriers and/or doors as a resu
32、lt of external pressure shall be limited either by the mechanical strength of the material or by suitable shoulder (see 8.1.2). The requirements of the appropriate product standard, if any, shall apply. CLC/TR 50473:2007 6 X-X is the centreline of the front projection and of the rail when the device
33、 is mounted. Figure 1a) Overall dimensions of the device Figure 1b) Mounting dimensions relevant to the enclosure Figure 1 Principal overall and related mounting dimensions of built-in devices d a h 1h 2l B q 0q 1 q 2q 3t X X The value of “t” shall allow the mounting of the device on a rail 35 mm x
34、7,5 mm to EN 60715, being fixed on a flat surface. Rail Front barrier Door P 1P 2 P 3f Y CLC/TR 50473:2007 7 Annex A (informative) Extension to devices fixed on two rails for mounting in the same distribution board This annex gives guidance on how the report may be applied for devices designed to be
35、 mounted on two rails. Devices with a height of 75 mm, 100 mm or 125 mm (see 5.2) may be mounted on two rails, using the same enclosures as devices with a height of 45 mm or 55 mm, which are intended to be mounted on one rail only. It is only necessary to cut out the part of the front barrier betwee
36、n two parallel mounting rails, e.g. at the meter distribution board. Another method of mounting is that only the operating means protrudes through the cover or front barrier. Provisions have to be adopted by the manufacturer of the board to ensure that the front barrier has the required rigidity aft
37、er cutting. Devices according to Figure A.1 are designed to be mounted on two rails, but it is also permissible to mount these devices on a single centre rail. These devices dont have an operating means, e.g. transformers, remote controls, etc. Devices according to Figure A.2 are also designed to be
38、 mounted on two rails and it is also permissible to mount these devices on a single centre rail. These devices can have their mounting means either integrated in the housing of the device of an adapter can be used, which is fixed to the housing of the device. The devices with the adapter are surface
39、-type devices, and different adapters may be used. Either devices where the mounting means is integrated in the housing or surface type devices with an adapter can be used. Figures A.1 and A.2 show examples of devices of one family-size using 125 mm distance between the two rails. CLC/TR 50473:2007
40、8 1) Mounting on two rails or on one single rail to EN 60715. 2) Accessible live parts shall be positioned in such a way that the distance from the live part to the outer surface of the front barrier at the edge of the window is not less than 6 mm taking into account the maximum cable cross section.
41、 3) Additional support according to 8.1.2. Figure A.1 - Dimensions for devices without operating means to be mounted on two rails. Preferred range of rated current I nup to 125 A Figure A.2 - Dimensions for devices to be mounted on two rails, including adapter, if any. Preferred range of rated curre
42、nt I nup to 125 A 170 0,5 2 1 1 1 125 0,5 215 max. 3 2 3 t 44 max.q 2q 3max1 11 125 0,5 215 max. 3 2 3 t 44 max.52 to 75 78 max. 2 2 Operating means 45 0,5 170 0,5 92,5 2 CLC/TR 50473:2007 9 PD CLC/TR 50473:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the in
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