This part of the IEC 62040 series of standards for uninterruptible power systems (UPS) is a type test product standard for electromagnetic compatibility (EMC) and applies to movable, stationary, fixed or built-in, pluggable and permanently connected UPS for use in low-voltage distribution systems with an environment being either residential, commercial, light industrial or industrial; that deliver output voltage with port voltages not exceeding 1500 V d.c. or 1000 V a.c. and that includes an energy storage device. Subject to installing, operating and maintaining the UPS in the manner prescribed by the manufacturer, this standard defines emission limits, immunity levels, test methods and performance criteria for a complete UPS to comply with the essential EMC requirements necessary to avoid the UPS interfering with other apparatus e.g. radio receivers and to avoid the UPS being affected by external phenomena. This standard does not address EMC phenomena produced by loads connected to the UPS or situations created by any apparatus external to the UPS other than as described in the immunity requirements. This part is harmonized with IEC CISPR series of standards for electromagnetic emission limits and with IEC 61000-4 series of immunity standards. It contains additional requirements applicable to UPS. This International Standard does not cover: Low-voltage d.c. power supply devices covered by IEC 61204; Systems wherein the output voltage is derived from a rotating machine. NOTE 1 UPS generally connect to their energy storage device through a d.c. link. A chemical battery is an example of an energy storage device. Alternative devices can be suitable, and as such, where battery appears in the text of this standard, where applicable, this can be understood as energy storage device . NOTE 2 This type test based product standard allows EMC conformity assessment of UPS included in either of categories C1, C2 and C3 before placing them on the market. It also provides guidance for conformity assessment of UPS included in category C4. See clause 4. UPS categories. NOTE 3 The differing test conditions necessary to encompass the range of physical sizes and power ratings of a complete UPS are taken into account. A complete UPS can consist of one or more interconnected units. For UPS configuration details refer to IEC 62040-3 Annex A NOTE 4 The requirements have been selected so as to permit an adequate level of EMC for UPS installed in residential, commercial, light industrial and industrial locations. The requirements are not always sufficient to cover situations with low probability of occurrence including UPS faults.