shown], shall be explosion proof.
All conduit shall be minimum 20 mm 3/4
inch size.
2.10.2
Operating Power
Power shall be 120 volts AC service, transformed through a two winding
isolation type transformer and rectified to 24 volts DC for operation of
all signal initiating, signal sounding, trouble signal, and actuating
(releasing) circuits. Provide secondary DC power supply for operation of
system in the event of failure of the AC supply. Transfer from normal to
emergency power or restoration from emergency to normal power shall be
fully automatic and shall not cause transmission of a false alarm. Obtain
AC operating power for control panel, [and] battery charger [, and air
compressor] from the line side of the incoming building power source ahead
of all building services. Provide independent properly fused safety
switch, with provisions for locking the cover and operating handle in the
"POWER ON" position for these connections and locate adjacent to the main
distribution panel. Paint switch box red and suitably identify by a
lettered designation.
2.10.3
Conductor Identification
Identify circuit conductors within each enclosure where a tap, splice or
termination is made. Identify conductors by plastic coated self sticking
printed markers or by heat-shrink type sleeves. Attach the markers in a
manner that will not permit accidental detachment. Properly identify
control circuit terminations.
2.11
SYSTEMS ACTIVATION
2.11.1
Overhead System Activation
**************************************************************************
NOTE: Follow the requirements specified in NFPA 13
to determine the number of risers required. Careful
coordination between paragraph "Initiating Zones"
and the number and location(s) of system risers
shown on the drawings is required. Overhead
systems, monitor systems and hose systems shall be
served by separate risers.
**************************************************************************
Upon activation of detection system or overhead system manual release
station(s), the corresponding [combination] overhead [and in-rack] system
protecting that area shall activate.
[2.11.2
Monitor System Activation
**************************************************************************
NOTE: Overhead systems, monitor systems and hose
systems shall be served by separate risers.
**************************************************************************
Upon activation of [two UV-IR detectors for more than 5 seconds or
activation of] a manual release station, all monitors in that zone shall be
activated. [Activation of a single UV/IR detector shall cause activation
of the fire alarms but shall not cause activation of the monitor nozzle(s).]
SECTION 13958N
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