This part of IEC 62040 applies to uninterruptible power systems (UPS) with an electrical
energy storage device in the d.c. link. It is used with IEC 60950-1, which is referred to in this
standard as "RD" (reference document).
NOTE UPS applications generally make use of a chemical battery as the energy storage device. Alternative
devices may be suitable, and as such, where “battery” appears in the text of this standard, where applicable, this
may be understood as “energy storage device”.
When a clause is referred to by the phrase "The definitions or the provisions of item/RD
apply", this phrase is intended to mean that the definitions or provisions in that clause of
IEC 60950-1 apply, except any which are clearly inapplicable to uninterruptible power
systems. National requirements additional to those in IEC 60950-1 apply and are found as
notes under relevant clauses of the RD.
The primary function of the UPS covered by this standard is to ensure continuity of an
alternating power source. The UPS may also serve to improve the quality of the power source
by keeping it within specified characteristics.
This standard is applicable to UPS which are movable, stationary, fixed or for building-in, for
use in low-voltage distribution systems and intended to be installed in any operator
accessible area or in restricted access locations as applicable. It specifies requirements to
ensure safety for the operator and layman who may come into contact with the equipment
and, where specifically stated, for the service person.
This standard is intended to ensure the safety of installed UPS, both as a single UPS unit or
as a system of interconnected UPS units, subject to installing, operating and maintaining the
UPS in the manner prescribed by the manufacturer.
This standard does not cover UPS based on rotating machines.
Electromagnetic compatibility (EMC) requirements and definitions are given in IEC 62040-2.