be not less than those listed in Tables 8.1, 8.2, and 8.3 of UL 1610for
alarm components, and NEMA ICS 2 and NEMA ICS 6 for other enclosures.
Sheet steel used in fabrication of enclosures shall be not less than 16
gage, except consoles may be 18 gage.
2.4.13.2
Doors and Covers
Doors and covers shall be flanged. Where doors are mounted on hinges with
exposed pins, the hinges shall be of the tight pin type, or the ends of
hinge pins shall be tack welded to prevent ready removal. Provide doors
having a latch edge length of less than 600 mm 24 inches with a single
lock. Where latch edge of a hinged door is 600 mm 24 inchesor 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
shall be held in place by tack welding, brazing, or one-way screws.
2.4.13.3
Ventilation
Ventilation openings in enclosures and cabinets shall conform to
requirements of UL 1610.
2.4.13.4
Mounting
Unless otherwise indicated, sheet metal enclosures shall be designed for
wall mounting with top hole slotted. Mounting holes shall be in positions
which remain accessible when major operating components are in place and
door is open, but shall be inaccessible when door is closed.
2.4.13.5
Labels
Labels shall be affixed to such boxes indicating they contain no
connections. These labels shall not indicate that the box is part of the
2.4.13.6
Enclosure Locks
Locks and key-lock-operated switches required to be installed on component
enclosures shall be UL listed, round-key type with three dual, one
mushroom, and three plain pin tumblers, or shall have a pick resistance
equal to a lock having a combination of five cylinder pin and five-point
three-position side bar in the same lock. Keys shall be stamped "U.S.
GOVT. DO NOT DUP." Key-lock-operated switches shall be keyed differently
and shall be two-position, with the key retractable from either position.
Furnish two keys for each switch. Maintenance locks shall be of the
one-way key-pull type arranged so that the key can be withdrawn only when
the lock is in the locked position. Locks on components for maintenance
access shall be keyed alike; only two keys shall be furnished for such
locks. Deliver keys, tagged with metal tags, accompanied by a
manufacturer's certificate which records the number of each key made.
2.4.14
Detection Sensors
Sensors shall detect penetration of the facility perimeter and protected
zones by unauthorized personnel or intruders with a probability of
detection (pd) of 0.9 with a 95 percent confidence level and, as
applicable, shall conform to UL 639. Unless otherwise specified, required
sensor power is plus 12 volts dc.
SECTION 13703N
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