Historical
IEC 62040-1-1 Ed. 1.0 b:2004
Uninterruptible power systems (UPS) - Part 1-1: General and safety requirements for UPS used in operator access areas
applies to electronic uninterruptible power systems (UPS) with an electrical energy storage device in the d.c. link. It is to be used with IEC 60950-1 which is referred to in this standard as ""RD"".
International Electrotechnical Commission [iec]