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ČSN EN 17347 This document specifies the safety requirements and their verification for the design and building of machines (see the definition in 3.1) for mounting and demounting tyres on the vehicles listed below and identified according to the international categories M1, M2, N1, O1, O2, L4 and L5: a) cars b) buses c) lorries d) motor-vehicles for specific or special transport e) mobile homes f) cargo trailers g) car trailers h) motorised quadricycles i) motor vehicles j) mopeds k) agricultural machines (if the wheel/tyre dimensions are compatible with the maximum dimensions indicated in the tyre changer user instructions) The vehicles listed in points a) to f) have an overall full-load mass no greater than 3,5 t. These machines are designed to ensure the tyre is correctly fitted on the wheel in safe conditions. The document describes how to eliminate or reduce the risks resulting from the foreseen use (or improper but reasonably foreseeable use) of these machines by the operator during normal operation and service. In addition, it specifies the type of information that the manufacturer will supply with regard to safe working procedures. The document describes all the significant hazards (as listed in Table 1) and the danger situations and events relating to these machines. This document does not apply to hazards regarding maintenance or repairs carried out by professional maintenance personnel. This document does not apply to automatic machines (machine, which, after initiation of start by the operator, is capable of independently perform one or more defined sequences of movements that lead to the complete assembly and disassembly of the tyre from the wheel. The operator has the task of supervising the process by intervening, if necessary). This document does not cover the reliability of control circuits. This document does not cover the risk of mechanical failure in operating conditions. This document does not apply to machines manufactured before its date of publication.