UFC 4-021-02NF
27 September 2006
change 1, 23 October 2006
9-6.2
Power. ESS loads should be fed from distribution panels within the protected
area. A good practice is to use distribution panels with dedicated security system
breakers that can be locked. No other load should be fed from breakers feeding ESS
loads. In addition to the panel nameplate, provide a label with the following inscription:
"Security System Breaker Within." Label shall be constructed and fastened identical to
the panel nameplate, except the label shall be red laminated plastic with white-center
core.
9-6.3
Backup Power
9-6.3.1 Battery Backup. The minimum requirement for battery backup for an IDS
and its monitoring station is eight hours. If primary power is subject to being out for
longer periods, increase backup capacity accordingly. The requirement for battery
backup for a SCIF and its monitoring station is 24 hours. The battery backup
requirement for a SCIF can be reduced if the system is on a generator. Monitoring
stations must have visible and audible indicators to inform system operators of failure of
a power source, a change in power source, and the location of the failure or change.
9-6.3.2 Generator and Uninterruptible Power Supply. ESS components are
primarily low voltage equipment devices and are easily supplied by battery backup. This
UFC is not intended to require a central UPS or generator to back up an ESS. When an
emergency power generator exists or is planned for other requirements, batteries may
serve as the backup power means during the diesel generator startup time period.
9-6.3.3 Backup Power for CCTV. Depending on criticality of an asset and the
availability of security forces to assess alarms, consideration should be given for
providing backup power for CCTV systems used for assessing alarm conditions.
9-6.3.3.1 Provide battery backup for CCTV system platforms that are used as an IDS
sensor.
9-6.3.4 Battery calculations should be required to verify the system's backup batteries
have the proper capacity.
9-6.4
TIA J-STD-607, NFPA 70,and NFPA 780 as applicable.
9-6.5
Cable Type. In general, data signals should be provided in shielded cable.
Data communication signals are sensitive to changes in capacitance and resistance
associated with different cable types. Digital "1s" and "0s" trigger on sharp LRC
(inductance, resistance, capacitance) time constants. The ESS designer should specify
low capacitance cable and sufficient twists per foot that meet manufacturers'
specifications. Dry contact signals can be provided in unshielded cable to lower the
cost of installation.
9-6.6
Surge Protection. Refer to UFC 3-520-01.
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