only required for FO system applications involving
security systems such as IDS, ESS or CCTV. This
requirement should be deleted for all other
applications. Generally, security screws are
preferred over tack welding or brazing because the
enclosure surface protection is not damaged.
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Enclosures and fittings of every description having hinged doors or
removable covers that contain the FO circuits, connections, splices, or
power supplies, shall be provided with cover-operated, corrosion-resistant
tamper switches, arranged to initiate an alarm signal when the door or
cover is moved. Tamper switches shall be mechanically mounted to maximize
the defeat time when enclosure covers are opened or removed. The enclosure
and the tamper switch shall function together to not allow direct line of
sight to any internal components and tampering with the switch or the
circuits before the switch activates. Tamper switches shall be
inaccessible until the switch is activated; have mounting hardware
concealed so that the location of the switch cannot be observed from the
exterior of the enclosure; be connected to circuits which are under
electrical supervision at all times, irrespective of the protection mode in
which the circuit is operating; shall be spring-loaded and held in the
closed position by the door cover; and shall be wired so that they break
the circuit when the door or cover is disturbed. Tamper switches located
in enclosures which must be opened to make routine maintenance adjustments
to the system and to service the power supplies shall be push/pull-set,
automatic reset type.
2.12.1
Enclosure Covers
Covers of pull and junction boxes provided to facilitate installation of
the system need not be provided with tamper switches if they contain no
splices, connections or power supplies, but shall be protected by [security
screws] [tack welding or brazing] to hold the covers in place. Zinc labels
shall be affixed to such boxes indicating they contain no connections.
These labels shall not indicate that the box is part of a security system.
Any damage to the enclosure or its cover's surface protection shall be
cleaned and repaired using the same type of surface protection as the
original enclosure. Conduit enclosures constructed of fiberglass shall be
secured with tamper proof security servers.
2.12.2
Conduit-Enclosure Connections
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NOTE: Tamper and physical protection provisions are
only required for FO system applications involving
security systems such as IDS, ESS, or CCTV. Delete
this requirement for all other applications.
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Conduit-enclosure connections shall be protected by tack welding or brazing
the conduit to the enclosure. Tack welding or brazing shall be done in
addition to standard conduit-enclosure connection methods as described in
NFPA 70. Any damage to the enclosure or its cover's surface protection
shall be cleaned and repaired using the same type of surface protection as
the original enclosure. Conduit enclosures constructed of fiberglass shall
be secured with tamper proof security screws.
SECTION 16768A
Page 22
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