This document applies to transfer switching equipment (TSE), to be used in power systems for ensuring the continuity of the supply and allowing the energy management of the installation, by transferring a load between power supply sources, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC. It covers: manually operated transfer switching equipment (MTSE); remotely operated transfer switching equipment (RTSE); automatic transfer switching equipment (ATSE), including the controller. NOTE 1 TSE used only for emergency escape lighting systems as described in IEC 60364-5-56 can be subject to specific rules and/or legal requirements and are not, therefore, covered by this document. NOTE 2 TSE for use in safety services requires additional installation requirements as defined in IEC 60364-5-56. It does not cover: 1) TSE configurations that are either not manufacturer tested and/or not marked according to this document as a complete transfer switch; 2) auxiliary contacts (covered by IEC 60947-5-1); 3) transfer switches used in explosive atmospheres (additional requirements covered by IEC 60079 series); 4) embedded software design rules (under responsibility of the manufacturer); NOTE 3 For guidance on the development of embedded software see IEC TR 63201. 5) cybersecurity aspects (covered by IEC TS 632081); 6) TSE rated for direct-on-line starting asynchronous motor of design NE and HE, according to IEC 60034-12:2016. NOTE 4 Other types of TSE to be covered by this document are under consideration: closed transition TSE, overlapping neutral TSE, multi-source TSE (i.e. TSE with more than two sources of supply), stand-alone ATS controllers, bypass isolation TSE, TSE with load-shedding functions and bus-tie TSE. The object of this document is to state: 1) the characteristics of the equipment; 2) the conditions of the equipment with respect to: a) operation for which the equipment is intended; b) operation and behaviour in case of specified abnormal conditions, for example, short374 circuit; c) dielectric properties; 3) the tests intended to confirm that these conditions have been met and the methods for performing these tests; 4) the product information to be provided by the manufacturer.