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 4X rating and shall be UL listed.
3.0 CABINET CONSTRUCTION
3.1.1 The cabinet and door shall be constructed from 5052-H32 sheet aluminum alloy, which has a thickness of 0.080 inch. Alternate material is type 304 stainless steel, minimum thickness 14 gauge. (Specifier must choose either aluminum or stainless steel construction.) 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 cabinet shall be designed with a crowned top to prevent the accumulation ofwater on its top surface.
3.1.4 The door opening(s) shall be double flanged on all four (4) sides, which increases strength around openings and keeps dirt and liquids from entering the enclosure when door is opened.
3.1.5 Door restraint(s) shall be provided to prevent door
movement in windy conditions.
3.2.1 The door opening will be a minimum of 80% of the front surface area and shall be hinged on the same side when facing the cabinet.
A. The doors shall be furnished with a gasket that satisfies the physical properties as found in UL508 table
21.1 and shall form a weather tight seal between the cabinet and door.
B. The closed door(s) will be flush With the side(s) of the enclosure.
3.2.2 The hinges shall be bolted to the cabinet and door utilizing 1/4-20 stainless steel carriage bolts and nylock
A. The hinges will be made of 0.075 inch thick stainless steel with a 0.250 inch diameter stainless steel hinge pin.
B. The hinge pin shall be capped top and bottom by weld to render it tamperproof.
C. Hinge leaves will not be exposed externally when the door is closed, but hinge knuckles may protrude.
3.2.3 The latching mechanism shall be a 3-point draw roller type.
A. Pushrods will be turned edgewise at the outward supports and shall be 0.250 inch by 0.750 inch aluminum, minimum.
B. Rollers shall have a minimum diameter of 0.875 inch and will be made of nylon. The center catch shall be fabricated from 0.187 inch aluminum, minimum.
3.2.4 An operating handle shall be furnished.
A. The handle will be stainless steel with a 3/4 inch diameter shank.
B. The latching handle shall have a provision for padlocking in the closed position.
3.2.5 A light/alarm switch bracket shall be provided.
4.0 EQUIPMENT MOUNTING
4.1 The enclosures shall be equipped with mounting brackets that accommodate the mounting of a 19” rack frame assembly.
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 door and any other parts to be painted will be treated with an iron phosphate coating 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 at 400-450 degrees F for ten(10) minutes.
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 CABINET MOUNTING
6.1 POLE MOUNTED ENCLOSURE
6.1.1 Enclosures intended for pole mounting shall be provided with stiffener plates with a thickness of 0.125inch aluminum welded to top and bottom of side wall for added, strength and rigidity.
6.2 PEDESTAL MOUNTED ENCLOSURE
6.2.1 Enclosures intended for pedestal mounting shall be provided with a reinforced base plate.
7.0 APPROVED MANUFACTURER
7.1 Cabinet is to be manufactured by APX Enclosures, lnc. or an approved UL listed equivalent.