1.1 The purpose of this specification is to provide details of an enclosure that protects internal equipment from rain, dust, vandalism and other conditions found in an outdoor or otherwise harsh environment.
1.2 The manufacturer must be able, upon request, to produce part numbers on all components for repair purposes. Certificates of compliance may be requested on each cabinet or on any component or part thereof.
2.1 The enclosure(s) will meet or exceed the requirements of a NEMA 3R rating and shall be U.L. listed.
3.0 CABINET CONSTRUCTION
3.1.1 The wrapper and door shall be constructed from type 5052-H32 sheet aluminum alloy which has a thickness of .125 inch. The top shall be made of .250 inch thick 5052-H32 aluminum. The enclosure bottom
shall be made of .500 inch thick 5052-H32 aluminum. External welds shall be made by using the Heliarc welding method;
whereas, internal welds will be made by the wire welding method. All welds shall be neatly formed and free of cracks, blow holes and other irregularities.
3.1.2 All inside and outside edges of the cabinet shall be free of burrs.
3.1.3 The door opening shall be double flanged on all (4) sides which increases strength
around openings and keeps dirt and liquids from entering the enclosure when door is opened.
3.2.1 The cabinet door will be a minimum of 80% of the front surface area and shall be hinged on the right side when facing the cabinet.
A. The door shall be furnished with a gasket that satisfies the physical properties
as found in UL508 table 21.1 and shall form a weathertight seal between the cabinet and door.
3.2.2 The hinges shall be bolted to the cabinet and door utilizing 1/4-20 stainless steel carriage bolts and nylock nuts.
A. The hinges will be made of .075 inch
stainless steel with a .250 diameter stainless steel hinge pin.
B. The hinge pin shall be capped top and bottom by weld to render it tamperproof.
3.2.3 The latching mechanism shall be slam latch type.
A. Door lock is keyed slam latch or equal and has a keyhole cover.
4.0 EQUIPMENT MOUNTING
(Specify as required)
4.1 PLYWOOD BACK PANEL
4.1.1 If the equipment is to be panel mounted, the enclosure shall be provided with a plywood back panel having a thickness of .750 inch.
4.1.2 The panel shall be treated. All mounting hardware will be furnished.
5.0 CABINET FINISH
5.1 Unless otherwise specified, the outside surface of the cabinet shall have a smooth, uniform, natural aluminum finish.
5.2 If painted, the following steps shall be taken as a minimum requirement.
5.2.1 The cabinet, doors and any other parts to be painted will be treated with an iron phosphate conversion technique.
5.2.2 After phosphatizing, the parts shall be baked to eliminate any moisture in seams.
5.2.3 The finish coat of a Polyester Powder will be baked ten (10) minutes at 400-450 degrees F.
5.2.4 The finish shall be commercially smooth,
substantially free of flow lines, paint washout, streaks, blisters and other defects that would impair serviceability or detract from general appearance.
6.0 PAD MOUNTED ENCLOSURE
6.1 Enclosures intended for pad mounting shall be constructed with the following patterns:
7.0 APPROVED MANUFACTURER
7.1 Cabinet is to be manufactured by APX Enclosures, Inc. or an approved U.L. listed equivalent.