2.4.9.1
Visual Annunciators
Annunciators shall be either liquid crystal displays (LCDs) or light
emitting diodes (LEDs). Annunciators shall be so connected in the circuit
that failure of the annunciator, socket, or protective circuitry shall not
result in an improper or indeterminate signal. LCDs and LEDs shall be
compatible with standby power supplies. LEDs shall be brightly lit and
visible from a distance of 9150 mm 30 feet in an area illuminated at 807 lx
75 footcandles. LEDs shall be used in outdoor applications or in the
presence of sunlight.
2.4.9.2
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 hardware to permit quick identification, intended use,
and location. Terminal markings and labels shall be of a permanent and
legible type and located to be visible when the associated system wiring is
in place. Identification markings shall be associated with each adjustment
device or item requiring periodic maintenance. Safety warning or cautions
shall be marked in conspicuous red letters. Control and indicator
identifications that are exposed outside enclosures shall be permanent,
machine-engraved letters, and painted to contrast with the background
color. Controls not required for operation of the system shall be
inaccessible to the system operator.
2.4.10
Test Points
Test points, controls, and other adjustments inside enclosures shall be
readily visible and accessible with minimum disassembly of equipment. Test
points and other maintenance controls shall not be readily accessible to
operator personnel.
2.4.11
Component Enclosures
Annunciator housings, power supply enclosures, sensor control and terminal
cabinets, control communicators, wiring gutters, and other component
housings, collectively referred to as enclosures, shall be formed and
assembled to be sturdy and rigid.
2.4.11.1
Metal Thickness
Thicknesses of metal in cast and sheet metal enclosures of all types shall
not be less than those in Tables 8.1, 8.2, and 8.3 of UL 1610 for alarm
components, and NEMA ICS 2 and NEMA ICS 6 for other enclosures.
2.4.11.2
Doors and Covers
Doors and covers shall be flanged. Where doors are mounted on hinges with
exposed pins, hinges shall be of the tight-pin type, or ends of hinge pins
shall be tack welded to prevent ready removal. Provide doors having a
latch edge length of less than 610 mm 24 inches with a single lock. Where
the latch edge of a hinged door is 610 mm 24 inches or more in length,
provide the door with a three-point latching device with lock; or
alternatively with two locks, one located near each end. Covers of
junction boxes provided to facilitate initial installation of the system
SECTION 13702N
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