tripping devices unless approved otherwise by the
Division or District Fire Protection Engineer.
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Master fire alarm boxes shall be of the coded, positive non-interfering
type with succession features having a local energy type auxiliary tripping
device. Boxes shall be of the prewound, open-door pull-lever type.
Mechanism shall be housed in a weatherproof cottage shell housing with
metallic bronze or nickel-alloy or rigid plastic code number plate mounted
on the exterior face of the cottage shell. Operation of the actuating
pull-lever shall cause the box to transmit four complete rounds of code.
Driving springs shall have the capability to transmit not less than 8
complete four round groups of code before being rewound. Boxes shall be
designed for operation at 100 milliamperes and shall be capable of full
operation between 70 and 120 milliamperes DC line current. Boxes shall
have the ability to transmit signals through ground to overcome an open
circuit. Box mechanism shall be capable of transmitting signals at varying
rates of speed ranging from electrical impulses at 3 1/4 second intervals
to 1/4 second intervals and shall be field adjustable to any speed within
this range. Each box shall have a manual signaling key, telephone jack,
silent test device and box shunt device. Code wheel shall be metallic. Box
code shall be as directed by the Contracting Officer. Box shall be [wall]
[pole] [pedestal]-mounted with center of box 1.50 meters 5 feet above
grade. Mounting bolts, brackets, and fastenings shall be copper alloy or
cadmium or zinc-coated steel. Transmitter housing shall be finished in
gloss red enamel. Housing shall have a reflective, highly visible label
imprinted with the word "FIRE" in minimum 50 mm two inch block characters
on both sides of the box.
][2.8.3.3
Automatic Auxiliary Transmitters
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NOTE: Specify automatic auxiliary transmitters for
connection to a PNIS type base fire alarm system
when there is no requirement for a new exterior
coded fire alarm box. For connection to a shunt
non-interfering (SNI) type base fire alarm system,
specify automatic auxiliary transmitters in all
instances. Master boxes are not manufactured for
SNI systems.
**************************************************************************
Auxiliary transmitters shall be of the coded, [positive non-interfering
type with succession features] [shunt non-interfering type]. Transmitters
shall be [prewound spring mechanism type having a local energy type
auxiliary tripping device] [or] [solid state electronic type utilizing form
"A" or form "C" dry contacts] which, when activated by the fire alarm
control panel, will transmit four rounds of code. Driving springs if
required shall have the capability to transmit not less than 8 complete
four-round groups of code before being rewound. [Electronic transmitters
shall have a standby battery with the capacity to power the transmitter in
a standby status for 60 hours and then transmit not less than 8 complete
four-round groups of code.] Transmitters shall be designed for operation at
100 milliamperes and shall be capable of full operation between 70 and 120
milliamperes DC line current. Transmitters shall have the ability to
transmit signals through ground to overcome an open circuit. Transmitters
shall have a device to disconnect the transmitter for maintenance purposes.
Code wheel if required shall be metallic. Transmitter code shall be as
directed by the Contracting Officer. The transmitter shall be capable of
SECTION 13957N
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