2.5.2
Fire Alarm Box Mounting
Provide [wall] [pole] [or] [pedestal] mounting [as indicated] with box
center 1525 mm 5 feet above grade. Mounting bolts, brackets, fastenings,
and conduit shall be copper-alloy, cadmium, or zinc-coated steel. Provide
a ruby-globe marker lamp in a weatherproof gasketed cast aluminum housing
at each fire alarm box. Locate marker lamp housing above the box, and
arranged so that moisture cannot collect at the junction of globe and
fixture. Marker lamp shall be a 130 volt, 25 watt, extended service lamp.
Provide zinc-coated steel pedestal and finished in at least two coats of
red enamel. Pedestal shall include box mounting assembly, terminal strip,
and terminal strip access door.
2.5.3
Fire Alarm Box Grounding
Provide connection from the grounding terminal connection of the box to
either a driven ground rod or a buried, metallic water pipe. Resistance to
ground shall not exceed 5 ohms. Do not consider the grounded neutral
connection of a three-phase or single-phase power supply as an adequate
ground for the fire alarm box ground.
[2.5.4
Auxiliary Transmitter
Configure auxiliary transmitter for automatic actuation through auxiliary
connections to local protective signaling systems [and initiating devices].
Auxiliary transmitters shall comply with the paragraph entitled "Master
Fire Alarm Boxes" but are not fitted with a pull lever [and may be housed
in noncottage-shells type enclosures].
]2.6
OVERVOLTAGE AND SURGE PROTECTION
2.6.1
Power Line Surge Protection
Protect equipment connected to ac circuits from power line surges.
Equipment shall meet requirements of IEEE C62.41. Do not use fuses for
surge protection.
2.6.2
Communications Link Surge Protection
Protect communications equipment against surges induced on communications
links. Install surge protection circuits at each end of cables and
conductors, except fiber optics, which serve as communications links, to
meet the following two waveforms:
a.
A 10 microsecond by 1000 microsecond waveform with a peak voltage
of 1500 volts and a peak current of 60 amperes.
b.
An 8 microsecond by 20 microsecond waveform with a peak voltage of
1000 volts and a peak current of 500 amperes. Provide protection
at the equipment. Install additional triple electrode gas surge
protectors, rated for the applications, on each wireline circuit
within three feet of the building entrance. Do not use fuses for
surge protection.
2.6.3
Sensor Wiring Surge Protection
Protect digital and analog inputs and outputs against surges induced by
sensor wiring installed outdoors and as shown. Test inputs and outputs
with the following two waveforms:
SECTION 13851N
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