This standard specifies electromagnetic compatibility (EMC) requirements for d.c. to a.c. power conversion equipment (PCE) for use in photovoltaic (PV) power systems. The PCE covered by this standard may be grid-interactive, which is termed as a grid connected power converter (GCPC), or stand-alone. It may be supplied by single or multiple photovoltaic modules grouped in various array configurations, and may be intended for use in conjunction with batteries or other forms of energy storage. This standard covers not only PCE connected to a public low voltage a.c. mains network or other low voltage a.c. mains installation, but also PCE connected to a medium or high voltage a.c. network with or without step-down power transformers. Requirements for the PCE connected to a medium or high voltage a.c. network are specified in this standard. However, some requirements relevant to grid interconnection are addressed with other standards specifying power quality or their own grid codes in some countries. PCE is assessed with EMC requirements as a type test at a test site. This standard provides test methods and test conditions for PCE as well as emission and immunity requirements, but not for photovoltaic modules and other balance of system components. When compliance with EMC requirements at the test site cannot be shown due to technical reasons of the test site, PCE can be assessed in situ, such as at the manufacturer s premises or in the field where the PCE is assembled into a PV power system. However, only high frequency emission requirements for in situ assessment are specified in CISPR11.