IEC 60715:2017 pdf download

IEC 60715:2017 pdf download.Dimensions of low-voltage switchgear and controlgear – Standardized mounting on rails for mechanical support of switchgear, controlgear and accessories
1 Scope
This document specifies dimensional and functional requirements for the compatible mounting of switchgear, controlgear and accessories on some types of rails. The object of this document is to specify those dimensions that are critical for the correct design of mounting rails and equipment. The following sections are covered by this document: – “top hat” section; – “C” section; – “G” section. NOTE 1 Mounting compatibility does not imply functional interchangeability. Annexes deal with specific steel mounting rails satisfying the requirements of this document, and give additional dimensional data and loading requirements applicable to such rails. NOTE 2 The detailed design and material of specific steel rails is given in the annexes. NOTE 3 Other shapes of rails complying with this document not listed in Annex A can be used. Mounting rails used as a protective conductor using a conducting connection to a protective conductor terminal block are specified in IEC 60947-7-2. In other applications where the mounting rail is used as earthing conductor, the relevant product standard applies. This document has the status of a horizontal standard in accordance with IEC Guide 1 08:2006. This horizontal standard is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 1 08. One of the responsibilities of a technical committee is, wherever applicable, to make use of horizontal standards in the preparation of its publications. The contents of this horizontal standard will not apply unless specifically referred to or included in the relevant publications.
4 Functional requirements
The basic functional requirement of mounting rails is that they shall adequately support mechanically the electrical equipment. The rail itself, in combination with the distance between the points of support and the nature of these supports, shall be of sufficient mechanical strength and stiffness to ensure the static and dynamic load of the equipment. Because of the great variety of equipment, and of combinations of equipment, and the spatial distribution of such equipment, it is not possible to state s pecific requirements that ensure proper performance under all conditions; however the detailed dimensions and the strength requirements given in Annex A and Annex B have been shown by experience to be suitable for use with a variety of equipment e.g. contactors, fuses, switches, terminal blocks, accessories and circuit-breakers. The responsibility for the correct construction and choice of materials lies with the manufacturer of the complete assembly. Rail mounting affects the performance of equipment, and it is advisable for product technical committees to give guidance in their publications on the suitability for mounting on rail.
5 Standard dimensions
5.1 General Unless otherwise mentioned, dimensions are given in millimetres. Only dimensions and angles which are critical for the correct design of the rail are specified in Figures 1 to 8. The indication “burr-free edge” may be made subject to agreement between manufacturer and user so as to ensure proper fitting in practical cases.In Figures 1 a), 2 a) and 3 a), the cross-hatched area shows the maximum space available for the rail, its supporting structure and fixing means. The remaining space is the maximum space which can be counted on as available for the equipment to be mounted on the rail. Figures 1 b), 2 b) and 3 b) show magnified details of the edge of the rail, including the manufacturing tolerances. The rails are symmetrical within the given tolerances. The angular tolerances indicated are one-sided and shall remain between zero and the values indicated. They include design tolerances.