6.13 Clean Power Systems
Uninterruptible Power Systems
In some facilities technology/server room back-up
systems may be designed by the tenant agency. If this is
the case, shell space and utility rough-ins shall be
provided. In facilities where uninterruptible power supply
(UPS) systems are to be provided as part of the building
construction, they shall be designed as described in this
section. All UPS systems are considered to be above
standard for GSA space. Tenant agencies with UPS
requirements are advised that a maintenance contract is
recommended.
Requirements for UPS systems must be evaluated on a
case by case basis. If UPS is required, it may or may not
require generator back-up. When generator back-up is
unnecessary, sufficient battery capacity shall be provided
to allow for an orderly shut-down.
Critical Technical Loads. The nature, size, and locations
of critical loads to be supplied by the UPS will be
provided in the program. The UPS system shall serve
critical loads only. Non-critical loads shall be served by
separate distribution systems supplied from either the
normal or electronic distribution system. A UPS system
shall be sized with 25 percent spare capacity The
specification of a redundant module shall depend upon
the criticality of the loads.
Emergency Electrical Power Source Requirements. When
the UPS is running on emergency power, the current to
recharge the UPS batteries shall be limited. This limited
battery charging load shall be added when sizing the
emergency generator.
203
ELECTRICAL
ENGINEERING
6.13
Clean Power Systems
Revised March 2005 PBS-P100
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