This standard contains requirements covering the performance of
emergency and standby power systems providing an alternate source
of electrical power to loads in buildings and facilities in the
event that the primary power source fails.
Power systems covered in this standard include power sources,
transfer equipment, controls, supervisory equipment, and all
related electrical and mechanical auxiliary and accessory equipment
needed to supply electrical power to the load terminals of the
This standard covers installation, maintenance, operation, and
testing requirements as they pertain to the performance of the
emergency power supply system (EPSS).
This standard does not cover the following:
(1) Application of the EPSS
(2) Emergency lighting unit equipment
(3) Distribution wiring
(4) Utility service when such service is permitted as the
(5) Parameters for stored energy devices
(6) The equipment of systems that are not classed as Level 1 or
This standard does not establish criteria for stored energy
The selection of any of the following is not within the scope of
(1) Specific buildings or facilities, or both, requiring an
(2) Specific loads to be served by the EPSS
(3)* Assignment of type, class, or level to any specific
Purpose. This standard contains performance
requirements for an EPSS.
It is the role of other NFPA standards to specify which
occupancies require an EPSS and the applicable level, type, and
class. This standard does not specify where an EPSS is
This standard also is intended to provide guidance for
inspectors, designers, installers, manufacturers, and users of
EPSSs and to serve as a vehicle for communication between the
parties involved. It is not intended as a design manual.
Compliance with this standard is not intended to exempt the
parties involved from their respective responsibilities for the
design, installation, maintenance, performance, or compliance with
other applicable standards and codes.
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