2.4.7
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NOTE: National Post Telephone and Telegraph is
normally the approving authority for EMR components
overseas.
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Provide only IDS components which are [Federal Communications Commission
(FCC)] [_____] licensed and approved. Provide system components which are
electromagnetically compatible.
2.4.8
Interchangeability
Like components shall be physically and functionally interchangeable as
complete items, without modification of either the original items or of
other components with which the items are used.
2.4.9
Safety
IDS components shall conform to application rules and requirements of NFPA
70 and applicable UL publications.
2.4.10
Human Engineering
Displays, other than wall-mount displays, shall be housed in standard
[desk-type consoles] [480 mm19 inch racks]. Central alarm reporting and
display unit shall be designed for operation by one individual. Aural
considerations shall include location of annunciators, tone pitch, quality,
and intensity. Number of different audible signals shall not exceed four.
Component design shall provide for ease of accessibility for maintenance.
2.4.10.1
Visual Annunciators
Annunciators shall be either electric lamps, liquid crystal displays
(LCDs), or light emitting diodes (LEDs). Annunciators shall be so
connected in the circuit that a failure of the annunciator, socket, or
protective circuitry shall not result in an improper or indeterminate
signal. Lamps, LCDs, and LEDs shall be compatible with standby power
supplies. LCDs shall be back-lit. LEDs shall be brightly lit and visible
from a distance of 9 meters 30 feet in an area illuminated at 805 lux 75
footcandles. Use LEDs in outdoor applications or in the presence of
sunlight. Electric lamps shall be long-life types having an average life
expectancy of not less than 50,000 hours and be clear, white, or frosted
with color caps of brilliant color. Signals shall be clearly visible from
a distance of 9 meters 30 feet in an area illuminated at 805 lux 75
footcandles. To the extent practicable, lamps shall be standardized for
multiple applications to reduce the number of types, sizes, and sockets in
the system. Lamps of varying types, voltage, and wattage shall have bases
and sockets that preclude incorrect replacement.
2.4.10.2
Controls
Provide to ensure ease of operation of specified characteristics. Where
applicable, clockwise rotation of controls shall result in an increasing
function. Controls, switches, visual signals and indicating devices, input
and output connectors, terminals, and test points shall be clearly marked
or labeled on the hardware to permit quick identification, intended use,
SECTION 13703N
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