The IEC 62310 series of three standards applies to stand-alone operating a.c. static transfersystems (STS) intended to ensure the continuity of load supply through controlled transfer, with orwithout interruption of power, from two or several independent a.c. sources.This series of standards includes information for the overall integration of the STS and itsaccessories into the a.c. power network and includes requirements for the switching elements, theircontrol and protective elements, where applicable.Part 1 of the series concerns general and safety requirementsPart 2 of the series concerns electromagnetic compatibility (EMC) requirementsPart 3 of the ser