Electrical work is specified in Section 16402 INTERIOR DISTRIBUTION SYSTEM,
except for control [and fire alarm] wiring. [Fire alarm system is
specified in Section [13852N INTERIOR FIRE ALARM SYSTEM] ["Fire Alarm and
Fire Detecting Systems (Local)"]].
2.10.1
Wiring
Provide control wiring and connections to fire alarm systems, under this
section and conforming to NFPA 70 and NFPA 72. Wire for 120 volt circuits
shall be No. 12 AWG minimum solid conductor. Wire for low voltage DC
circuits shall be No. [14] [16] AWG minimum solid conductor [, except wire
to remote annunciators, if provided, may be 18 AWG minimum solid
conductor]. All wiring shall be color coded. Wiring, conduit and devices
exposed to water or foam discharge shall be weatherproof. Wiring, conduit
and devices located in hazardous atmospheres, as defined by NFPA 70[and as
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
SYSTEM ACTIVATION
2.11.1
Overhead System Activation
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NOTE: Provide one or more risers per hangar bay as
required by NFPA 409 based on size of bay. Overhead
systems, monitor systems and hose systems shall be
served by separate risers.
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Each zone shall encompass the area [protected by each riser] [of one hangar
bay]. Upon activation of the detection system or overhead system manual
release station(s), the corresponding overhead system protecting that area
shall activate.
SECTION 13956N
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