UFC 4-022-01
25 May 2005
6-10.1 Alternate Electrical Power Source
Each ECF should have an alternate electrical power source. In the event of a loss of
the primary electrical source, a reliable alternate power source is necessary to ensure
continuous operation of the ECF. Use a standby generator or other equivalent means
as the alternate electrical power source. Provide either automatic or manual starting of
the generator and load transfer depending on the permissible duration of the electrical
power outage per TM 5-811-1, Electrical Power Supply and Distribution. In some
cases, installations may specify the use of portable generators in addition to stationary
auxiliary electrical power sources. Where portable units are utilized, provide a suitable
location and a power connection point. Equipment on back-up power should include
gatehouse interior and exterior lighting, canopy lighting, exterior lighting in the Access
Control Zone, roadway lighting within 100 ft (30.3m) of both sides of the Access Control
Zone, roadway lighting at the vehicle barrier location(s), exterior lighting at the search
area(s), traffic control arms, the active vehicle barrier charging motor (if applicable), and
the uninterruptible power supply (UPS). The generator should be provided with
sufficient fuel to provide back-up power for a period of at least twelve (12) hours or as
required to support the installation's plan for refueling operations. If a fixed generator is
provided, auto-start capability should be provided.
6-10.2 Uninterruptible Power Supply
In order to maintain security and barrier safety functions, provide an uninterruptible
power supply (UPS) for use during generator starting and load transfer. The UPS
system supports computerized equipment to avoid power disruption. As a minimum,
provide UPS for the following: Primary communications system, duress alarm system,
computers, CCTV systems, Intrusion Detection Systems (IDS), Enunciator, and Access
Control Equipment including active vehicle barrier controls, barrier activation device (for
emergency close), any traffic arms used for safety at the active vehicle barrier, traffic
sensors, and barrier signals and warning lights. UPS will not normally be used for
security lighting per TM 5-811-1. Due to the power requirements and nonlinear nature
of lighting, avoid placing lighting loads on the UPS. Provide limited lighting at the
control consoles in the gatehouse, inspection office, and overwatch position with stand-
alone emergency lights. If the installation requires the use of UPS to support lighting,
the design should clearly identify the nonlinear nature and switching patterns of the load
to be served per TM 5-811-1. It may be desirable to place limited lighting on UPS to
avoid restrike concerns; see paragraph 6-14 for further information.
6-10.3 Infrastructure
Frequently, new underground utilities for existing site elements must be placed within
the right-of-way. New security systems and technology must also be installed. Such
construction can disrupt traffic and interfere with the function of the ECF and thus pose
a security risk. This can be a significant problem at an ECF that is frequently one of the
most congested and critical areas on an installation, but for security reasons often has
poor or no alternative routings.
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