Home' RTCA Documents for Review : DO-230H FRAC Contents 92
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An access control system combines and allows configuration of a few common, basic devices such as card
readers, door locking devices, door position switches and exit devices to accommodate various types of doors,
portals, gates, barriers and other controlled openings to a wide variety of operations.
Locking mechanism – Can be programmed through the PACS field panel to release the locking device
(electric and magnetic lock(s), turnstile(s), vehicle gate barrier(s), etc.) for a pre-determined amount of
time (few seconds to several minutes). For any portal where electro-mechanical locking devices are
deployed; Uninterruptible Power Supplies (UPS) are significant design considerations. Regional life and
safety codes may prohibit, (or mandate) certain types of locking devices; always consult with the local fire
marshal before finalizing the system design at these portals. Mechanical failure of electro-mechanical
locking devices should generate an alarm.
Portal position switch
Monitors the position of the portal or barrier to create an alarm condition when the portal is in an
abnormal position. The most typical condition is a portal that is being held open for an extended period
of time. When the portal has been changed position without required credential verification, this will
generate an alarm also.
A second function of the portal position switch is to automatically relock the locking hardware if the
portal is open and closed for a period shorter than the maximum allowed duration. Configured correctly,
this effectively prevents the portal from being opened more than one time for each access. Various portals
and locking hardware requires configuration of the re-locking event and unlock durations to be configured
to accommodate the specific portal and locking hardware.
Request to Exit (RQE, REX) Device – Allows exiting the secure area without causing the door
position switch to trigger a “Forced Open” alarm. In some cases, the RQE also unlocks the
door hardware. Local fire codes regulate how this device is configured and may require a
mechanical Push Bar.
Push Bar (Also referred to as a Panic Bar) – Pushing the bar releases the locking mechanism
(retracts the deadbolts) and allows exiting from the secure area without using a card and reader.
To prevent the high-security door contact from triggering a “Forced Open” alarm, push bars can
be ordered with a RQE switch function. Local fire codes are strict and varied across the
country, check with AHJ before selecting RQE devices and push bars.
Common portal considerations – There has to be some visual reference to the user who access has been
granted or denied. Without this reference, unnecessary alarms will be created.
The location of the reader will dictate the parameters used that create an alarm condition. When the location
is inconveniently placed such as being too far away or on the wrong side of the portal, there may not be
enough time to access the portal.
When creating specifications for portal it is recommended that the Construction Specificatio ns Institute
(CSI) coding should be used. These are used by most architects and contractors. [Refer: www.csinet.org
for additional details.]
Compliance with Federal and local government ADA regulations needs to be reviewed for all foot traffic
portals. The door assembly should comply with ANSI Grade 1 Holding Force 1650lb (748kg. Consideration
of the vacuum that is created from the air pressure inside the building compared to the outside has to be
addressed for the closing hardware.
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