2.1.5.1
Interior Sensor
Sensors to be used in an interior environment shall have a housing that
provides protection against dust, falling dirt, and dripping noncorrosive
liquids.
2.1.5.2
Exterior Sensor
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.
2.1.5.3
Interior Electronics
System electronics to be used in an interior environment shall be housed in
enclosures which meet the requirements of NEMA 250 Type 12.
2.1.5.4
Exterior Electronics
System electronics to be used in an exterior environment shall be housed in
enclosures which meet the requirements of NEMA 250 Type 4.
2.1.5.5
Corrosion Resistant
System electronics to be used in a corrosive environment as defined in NEMA
250 shall be housed in metallic non-corrosive enclosures which meet the
requirements of NEMA 250 Type 4X.
2.1.5.6
Hazardous Environment Equipment
System electronics to be used in a hazardous environment shall be housed in
a enclosures which meet the requirements of paragraph Hazardous Environment.
2.1.6
Nameplates
Laminated plastic nameplates shall be provided for local processors. Each
nameplate shall identify the local processor and its location within the
system. Laminated plastic shall be 3 mm 1/8 inch thick, white with black
center core. Nameplates shall be a minimum of 25 x 75 mm 1 x 3 inches,
with minimum 6 mm 1/4 inch high engraved block lettering. Nameplates shall
be attached to the inside of the enclosure housing the local processor.
Other major components of the system 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 x 75 mm 1 x 3 inches.
2.1.7
Fungus Treatment
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NOTE: Fungus treatment should only be used on
equipment to be installed in climates that are known
to have problems with fungus growth. Examples are
extremely tropical climates or humid, poorly
ventilated areas. If these conditions do not exist,
delete the fungus treatment requirement.
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System components located in fungus growth inductive environments shall be
SECTION 13720A
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