number 11105, FED-STD-595. except as otherwise specified herein for each
individual transmitter configuration. Repaint all surfaces damaged during
installation to match existing paint. Securely affix a metallic or rigid
plastic engraved code number plate to the front of the enclosure.
2.1.11.1
Security
Switches and internal components shall be protected from tampering by a
tamperproof lock on the transmitter enclosure door. Locks for all
transmitters of each configuration provided shall be keyed alike.
2.1.12
Antennas and Cables
Provide antennas for radio alarm transmitters of the omnidirectional
unity-gain coaxial or directional gain type as required for reliable signal
transmission and reception. Provide antennas with driving point impedance
matching transmitter output. Antennas and mounting hardware shall be heavy
duty, corrosion resistant, and designed to withstand wind velocities of
[161] [242] km/h [100] [150] mph. Provide RG8U or RG58U, minimum 95
percent shielded coaxial cables utilizing PL-259 connectors. Connectors
shall be protected against moisture. No splices will be permitted in any
cable. Crimp-type connectors are not permitted. Run cables alone in
separate conduit except where enclosed in a master box or street box
pedestal.
2.1.13
Provide lightning arresters for transmitter antennas that do not have
integral protection or do not function at ground potential, and for
auxiliary connection and power supply wiring. Lightning protection shall
be in accordance with NFPA 70. Transmitters shall not exhibit
mis-operation or failure when electrical transients of IEEE C62.41 Category
B are applied to the AC power line.
2.1.14
Moisture Protection
Provide printed circuit boards in transmitters (and interface panels if
provided), with a non-nutrient conformal coating for protection against
moisture and fungus. The coating shall be suitable for the climate in
which the equipment is to operate and shall be applied at the factory in
accordance with the coating manufacturer's specifications.
2.2
RADIO MASTER BOXES
**************************************************************************
NOTE: Delete paragraphs for transmitter
configurations and options not required.
Master
boxes are generally used when both an exterior
manual alarm box and transmission of alarms from
protected premises systems are required. Consult the
EFD/EFA Fire Protection Engineer for further
guidance.
**************************************************************************
Provide master boxes where shown, configured for both manual actuation by a
publicly-accessible lever or pushbutton on the front of each transmitter
and for automatic actuation through wired connections to protected
premises alarm control units and fire suppression / extinguishing system
control units [and dry-contact initiating devices]. Master box
SECTION 13853N
Page 17
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