2.1.2 Field Enclosures
2.1.2.1 Interior Sensors
Sensors to be used in an interior environment shall have a housing that
provides protection against dust, falling dirt, and dripping non-corrosive
liquids.
2.1.2.2 Exterior Sensors
Sensors to be used in an exterior environment shall have a housing that
provides protection against windblown dust, rain and splashing water, and
hose directed water. Sensors shall be undamaged by the formation of ice on
the enclosure.
2.1.2.3 Interior Electronics
Systems electronics to be used in an interior environment shall be housed
in enclosures which meet the requirements of
NEMA 250
, Type 12.
2.1.2.4 Exterior Electronics
Systems electronics to be used in an exterior environment shall be housed
in enclosures which meet the requirements of
NEMA 250
, Type 4X.
2.1.2.5 Corrosion Resistant
System electronics to be used in a corrosive environment as defined in
NEMA 250
shall be housed in non-metallic non-corrosive enclosures which
meet the requirements of
NEMA 250
, Type 4X.
2.1.3 Nameplates
Nameplates shall be provided for major components of the system.
Nameplates shall have the manufacturer's name, address, type or style,
model or serial number, and catalog number on a corrosion resistant plate
secured to the item of equipment. Nameplates will not be required for
devices smaller than
25 by 75 mm
1 by 3 inch
.
2.1.4 Tamper Switches
Equipment enclosures for the AVBCS, RSM, CCTV, and the active vehicle
barrier shall have hinged doors or removable covers. The doors or covers
shall be provided with cover operated, corrosion-resistant tamper switches,
arranged to initiate an alarm signal when the door or cover is moved. The
enclosure and the tamper switch shall function together and shall not allow
direct line of sight to any internal components before the switch
activates. Tamper switches shall be inaccessible until the switch is
activated; have mounting hardware concealed so that the location of the
switch cannot be observed from the exterior of the enclosure; be connected
to circuits which are under electrical supervision at all times,
irrespective of the protection mode in which the circuit is operating;
shall be spring-loaded and held in the closed position by the door or
cover; and shall be wired so that the circuit is broken when the door or
cover is disturbed.
2.1.5 Locks and Key-Lock Switches
**************************************************************************
SECTION 34 41 26.00 10 Page 23