shall have a minimum gap of [10] [19] mm [3/8] [3/4] inch and a
maximum gap of [31.75] [63.5] mm [1 1/4] [2 1/2] inches without
internal adjustment. [Surface mount BMS housing for the switch
element shall have capabilities to receive threaded conduit.] The
housing cover for surface mounted BMS, if made of cast aluminum,
shall be secured by stainless steel screws. The magnet housing
cover shall not be readily removable. [Protect the BMS housing
from unauthorized access by a cover operated, corrosion-resistant
tamper device. The device shall initiate an alarm when the cover
is opened as little as 3.17 mm 1/8 inch and shall be inaccessible
until actuated.] [Conductors running from the door to alarm
circuits shall be jumpered within a flexible armored cord
constructed from corrosion-resistant metal. Each end of the
armored cord shall terminate in a junction box or other enclosure.
Armored cord ends shall be mechanically secured to junction boxes
by clamps or bushings. Conductors within the armored cord shall
be provided with lug terminals at each end. Jumpered conductors
and the armored cord shall experience no mechanical strain as the
door is removed from fully open to closed. The switch circuit
shall initiate an alarm if a short circuit is applied to the door
cord.]
(3) Recessed BMS: The recessed BMS shall have a gap up to 12.7
mm (9.5 mm in steel) (1/2 inch (3/8 inch in steel). Field
adjustments in the fixed space between magnet and switch housing
shall not be possible. [Ball bearing door trips shall be mounted
within vault door headers such that when the locking mechanism is
secured, the door bolt engages an actuator, mechanically closing
the switch. The door bolt locking mechanism shall be completely
engaged before the ball bearing door trip is activated. Provide
circuit jumpers from the door.]
b.
Glass breakage detection
(1) Breakwire sensors: Sensors shall consist of fine wire
embedded in or affixed to the interior of the glazing. Breakage of
protected glazing shall result in wire breakage. Wire shall be
hard drawn copper and shall not exceed 26 AWG diameter. If
affixed to glazing, protect the sensor wire by a clear coating
which shall not inhibit sensor functioning. Sensor shall be
terminated in insulated connectors which are [concealed] [tamper
protected].
(2) Glass breakage sensors: Sensors shall detect window breakage
by responding to sonic or vibration frequencies that accompany
breaking glass. Sensors shall selectively filter input to detect
only frequency of breaking glass and to minimize false alarms from
sources such as jangling keys, ringing phones, and slamming doors.
Glass breakage sensors shall initiate alarm when the glass they
protect is cracked or broken. Sensors shall provide positive
detection of breakage of plate, safety, laminated, and tempered
glass. Sensor shall have a sensitivity adjustment controlling the
output voltage from the detecting element which triggers a
solid-state latching device. Provide the sensor with an LED for
adjusting the sensitivity. [Sensor shall be contained in a
fire-resistant ABS plastic housing and shall be mounted in contact
with the window. Supply the sensor with a two-sided polyurethane
tape with acrylic adhesive. Provide the sensor with an exterior
label to protect the tape from direct sunlight.] [Sensor shall be
SECTION 13702N
Page 18
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