which, in turn, serves appropriate automatic transfer
Clean Power. It is not economical, or convenient, to
switches (ATS) and the fire pump. Separate ATS should be
provide electrical supply from back-up generators and/or
provided for the Life Safety/Security System, UPS system,
a central UPS to a small proportion of outlets in office
and essential systems. (Essential systems will serve the
areas. However, every desk in the courthouse is likely to
ventilation and equipment loads required for personnel
support PC's or other data/telecommunication
and building protection in the event of a commercial
equipment, and "clean" (dedicated service with no
power failure or other catastrophic event.)
harmonies or spikes) desk circuits should be protected by
excluding "dirty" loads (such as large photocopiers and
Discussions should be held early in the design process on
vacuum cleaners).
a U.S. Court facility project to determine whether UPS is
required for any function at the facility.
On-Floor Electrical Distribution
If a building-wide UPS system is provided, the system
Most areas of the courthouse may incorporate underfloor
should serve the building distribution system at
horizontal distribution systems. Final horizontal distri-
208Y/120V. This system will have an output at 208Y/120V
bution plans will be designed considering potential
distributed through the building by a UPS power riser in
EMI/RFI sources. (Access floor areas will comply with
each on-floor electric room. Taps from the riser will
Chapter 6.)
provide power to on-floor transformers and branch
panels in each electric room to serve on-floor loads
Emergency and UPS Power Systems
requiring UPS power. (Connected loads on the UPS
power system may include PABX, computer and local
Service and Distribution. Emergency and normal electrical
equipment rooms.)
panels, conduit, and switchgear will be installed separately,
at different locations, and as far apart as possible. Electrical
Coordination with Telecommunication System Design
distribution should also run at separate locations.
Electrical power distribution for the various areas of U.S.
Conduit and lines need to be installed on the exterior of
Court facilities should be coordinated with the design of
the building to allow use of a trailer-mounted generator
the telecommunication powering/grounding systems to
to connect to the building's electrical system. This will be
improve the overall integrity of the telecommunications
regarded as a tertiary source of power for systems in the
utility. As technology continues to increase in speed/
building where operational continuity is critical. (An
performance, better distribution coordination becomes
operational plan should be in place to provide this service
necessary. If this is not done, the grounding systems will
quickly when needed.)
not operate efficiently at the higher frequency ground
Emergency power will be derived from generators sized
currents, reducing the integrity of the telecom utility
to carry the required loads. Generators should be
(creating errors in transmission, etc.).
synchronized to serve a common distribution board
283
DESIGN
STANDARDS
FOR
U.S.
COURT
FAC I L IT I E S
9.7
Electrical Systems
Revised March 2005 PBS-P100
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