Cables and conductors, which serve as communications links, shall
have surge protection circuits installed at each end that meet the
following waveform[s]:
(1) A 10 microsecond by 1000 microsecond waveform with a peak
voltage of 1500 volts and a peak current of 60 amperes.
[(2) An 8 microsecond by 20 microsecond waveform with a peak
voltage of 1000 volts and a peak current of 500 amperes.
Protection shall be provided at the equipment. Additional triple
electrode gas surge protectors, rated for the application, shall
be installed on each wireline circuit within 915 mm 3 feet of the
building cable entrance. Fuses shall not be used for surge
protection.]
[b.
Sensor Wiring Surge Protection: Digital and analog inputs and
outputs shall be protected against surges induced by sensor wiring
installed outdoors and as shown. The inputs and outputs shall be
tested with the following waveform[s]:
(1) A 10 by 1000 microsecond waveform with a peak voltage of 1500
volts and a peak current of 60 amperes.
[(2) An 8 by 20 microsecond waveform with a peak voltage of 1000
volts and a peak current of 500 amperes. Fuses shall not be used
for surge protection.]]
2.2.5
Addressable Interface Devices
The addressable interface (AI) device shall provide an addressable input
interface to the FACP for monitoring normally open or normally closed
contact devices such as waterflow switches, valve supervisory switches,
fire pump monitoring, independent smoke detection systems, relays for
output function actuation, etc.
[2.2.6
Smoke Sensors
**************************************************************************
NOTE: Provide smoke sensors only in spaces where
they are specifically required by MIL-HDBK-1008.
**************************************************************************
2.2.6.1
Photoelectric Smoke Sensors
Provide addressable photoelectric smoke sensors as follows:
a.
Provide analog/addressable photoelectric smoke sensors utilizing
the photoelectric light scattering principle for operation in
accordance with UL 268. Smoke sensors shall be listed for use
with the fire alarm control panel.
b.
Provide self-restoring type sensors which do not require any
readjustment after actuation at the FACP to restore them to normal
operation. Sensors shall be UL listed as smoke-automatic fire
sensors.
c.
Components shall be rust and corrosion resistant. Vibration shall
have no effect on the sensor's operation. Protect the detection
chamber with a fine mesh metallic screen which prevents the
SECTION 13855N
Page 18
Previous Page
