scope:

This part of EN 60947applies to transfer switching equipment (TSE) to be used in power systems with interruption of the supply to the load during transfer, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c. It covers: - manually operated transfer switching equipment (MTSE); - remote operated transfer switching equipment (RTSE); - automatic transfer switching equipment (ATSE). It covers TSE provided with or without an enclosure. Devices necessary for the control (e.g. control switches, etc.) and the protection (e.g. circuitbreakers, etc.) of a TSE are covered by the relevant IEC standards. NOTE - TSE used only for emergency lighting may be subject to specific rules and for legal requirements and are not, therefore, covered by this standard.