within 15 seconds. An "open" in the battery circuit or standby battery
voltage below 85 percent of rated voltage (while on AC power) shall cause
activation of console trouble signals.
2.4.11
Consoles shall be designed with modular components to allow interchange of
components for maintenance purposes. Interconnecting cables and connectors
shall be compatible with computer quality signal data transmission.
2.5
CONDUIT
2.5.1
Rigid Steel Conduit (Zinc-Coated)
ANSI C80.1.
2.5.2
Intermediate Metal Conduit (IMC)
UL 1242, zinc-coated steel only.
2.5.3
Electrical Metallic Tubing (EMT)
ANSI C80.3.
2.6
OUTLET BOXES
UL 514A, zinc-coated steel.
Fittings for conduit and outlet boxes UL 514B,
zinc-coated steel.
2.7
WIRING
NFPA 70 and NFPA 72. Wire for 120 V circuits shall be No. 12 AWG minimum.
Wire for low voltage DC circuits shall be No. 14 AWG minimum. Color code
wiring.
2.8
GROUND RODS
**************************************************************************
NOTE: For projects administered by Atlantic
Division, NAVFACENGCOM, change 10 ohms to 5 ohms.
**************************************************************************
UL 467. Rods shall be the sectional type, copper-encased steel, with a
minimum diameter of 19 mm3/4 inch and a minimum length of 3050 mm10 feet.
The rods shall have a hard, clean, smooth, continuous copper surface, and
the proportion of copper shall be uniform throughout the length of the rod.
The copper shall have a minimum wall thickness of .33 mm.013 inch at any
point on the rod. Ground rods shall not protrude more than 150 mm6 inches
above grade. Non-current carrying metallic parts associated with new fire
alarm equipment shall have maximum resistance to solid "earth" ground not
to exceed the following values:
Digital Alarm Communicator Transmitter
10 ohms
Digital Alarm Communicator Receiver
10 ohms
Interface Panels
10 ohms
SECTION 13854N
Page 17
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