INTERNATIONAL STANDARD ISO 13850 Second edition 2006-11-15 Safety of machinery — Emergency stop — Principles for design Sécurité des machines — Arrêt d'urgence — Principes de conception Reference number ISO 13850:2006(E) © ISO 2006 

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ISO 13850:2006(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 13850 was prepared by Technical Committee ISO/TC 199, Safety of machinery, and Technical Committee IEC/TC 44, Safety of machinery — Electrotechnical aspects. This second edition cancels and replaces the first edition (ISO 13850:1996), which has been technically revised. Notably, it incorporates the following significant changes: a) resetting of the emergency stop command is required to be manual (see 4.1.6); b) emergency stop devices are required to use mechanical latching (see 4.4.3). © ISO 2006 – All rights reserved iii 

ISO 13850:2006(E) Introduction The structure of safety standards in the field of machinery is as follows. a) Type-A standards (basis standards) give basic concepts, principles for design, and general aspects that can be applied to machinery. b) Type-B standards (generic safety standards) deal with one or more safety aspect(s) or one or more type(s) of safeguard that can be used across a wide range of machinery: ⎯ type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise); ⎯ type-B2 standards on safeguards (e.g. two-hands controls, interlocking devices, pressure sensitive devices, guards). c) Type-C standards (machinery safety standards) deal with detailed safety requirements for a particular machine or group of machines. This International Standard is a type-B2 standard as stated in ISO 12100-1. When provisions of a type-C standard are different from those which are stated in type-A or type-B standards, the provisions of the type-C standard take precedence over the provisions of the other standards for machines that have been designed and built according to the provisions of the type-C standard. iv © ISO 2006 – All rights reserved 

INTERNATIONAL STANDARD ISO 13850:2006(E) Safety of machinery — Emergency stop — Principles for design 1 Scope This International Standard specifies functional requirements and design principles for the emergency stop function on machinery, independent of the type of energy used to control the function. It is applicable to all machinery except for: ⎯ machines in which the provision of emergency stop would not lessen the risk; ⎯ hand-held portable machines and hand-guided machines. It does not deal with functions such as reversal or limitation of motion, deflection, shielding, braking or disconnecting, which can be part of the emergency stop function. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60204-1:2005 Safety of machinery — Electrical equipment of machines — Part 1: General requirements IEC 60947-5-5:2005, Low-voltage switchgear and controlgear — Part 5-5: Control circuit devices and switching elements — Electrical emergency stop device with mechanical latching function IEC 60417-DB:2002, Graphical symbols for use on equipment (on-line database) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 emergency stop emergency stop function function that is intended to ⎯ avert arising, or reduce existing, hazards to persons, damage to machinery or to work in progress, ⎯ be initiated by a single human action NOTE 1 Hazards, for the purposes of this International Standard, are those which can arise from ⎯ ⎯ normal operation. functional irregularities (e.g. machinery malfunction, unacceptable properties of the material processed, human error), NOTE 2 Adapted from ISO 12100-1:2003, definition 3.37. © ISO 2006 – All rights reserved 1