UFC 4-021-02NF
27 September 2006
change 1, 23 October 2006
9-6.13.2 All conduit and cabling associated with the ESS should not extend beyond the
perimeter of the protected area.
9-6.14
Labeling. Cables should be labeled at origination, termination, entry into and
exit from enclosures with permanent labels.
9-6.15
Shielding. When required, shielded cable should only be grounded at one
end typically back at the local security panel to prevent open loop grounds. A
common question is whether or not cables in metallic conduit are required to use
shielded cable. If there is more than one communications cable in the metallic conduit,
the answer is yes the cables should be shielded. Most manufacturers specify shielded
cable such as the cable running out to card readers. The designer should follow the
manufacturer's recommendations.
9-6.16
Fire Alarm System Interface. In the United States most egress doors are
required to unlock (in the path of emergency egress) in the event of a fire emergency.
(Note: certain institutional facilities are exempt from this automatic door-unlock
requirement, for example, prisons or high-security hospitals.) Methods vary on how this
may be accomplished. If free egress hardware is supplied (which is possible when
electric locks or electric strikes are used), then that is all that is required. If magnetic
locks are supplied, this life safety function has to be achieved by interfacing the ACS
with the fire alarm system. Where doors are locked (electrically by magnetic locks or
other devices not supplied with free exit hardware), the interface shown in Figure 9-2
should be specified in the design.
Figure 9-2. Interface Between Fire alarm and Security Panel
Wire and Conduit
9-6.16.1 Figure 9-2 illustrates the necessary interface signal between the fire alarm
system and each local door controller panel. The ESS design needs to include the
elements identified in Figure 9-3 for system interface.
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