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 rating (Specify either 3R or 4X) and shall be UL listed.
3.0 CABINET CONSTRUCTION
3.1.1 The cabinet and door(s) shall be constructed from 5052-H32 sheet aluminum alloy which has a thickness of 0.125 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 of water 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 cabinet door(s) 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 door(s) shall be furnished with a gasket that satisfies the physical properties as found in UL508 table
21.1 and shall from a weathertight 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 nuts.
A. The hinges will be made of 0.075 inch 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. Note: On NEMA type 4X enclosures,
all bolt holes shall be gasketed.
3.2.3 The latching mechanism shall be a three-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 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 handles shall have a provision for padlocking in the closed position.
C. (3R only) The lock shall be keyed dead bolt #200725 or equivalent. Two (2) keys will be furnished with each lock.
Note: On NEMA Type 4X enclosures, the specified Corbin Lock is deleted. These are available only with padlocking on the latching handle.
3.2.5 A light/alarm switch bracket shall be provided.
3.3 SWITCH COMPARTMENT (Optional-3R only)
3.3.1 A switch compartment, with removable back panel is supplied on the enclosure.
A. The door shall be furnished with a gasket that satisfies the physical properties as found in UL508 table 21.1 and
will form a weathertight seal between cabinet and door.
3.3.2 The switch compartment door lock is a keyed slam latch #200698, or equal, and has a keyhole cover. Note: On NEMA Type 4X enclosures, the switch compartment is deleted.
3.3.3 The switch compartment door hinge is 0.063 inch stainless steel with a 0.120 inch diameter stainless steel hinge pin.
4.0 CABINET VENTILATION
(NEMA 3R ONLY)
4.1 A cabinet requiring ventilation shall be provided with louvered vents in the front door with a removable air filter.
4.1.1 Louvers shall satisfy the NEMA rod entry test for 3R ventilated enclosures.
4.1.2 The filter will cover the vents and shall be held firmly in place with bottom and top brackets and a springloaded upper clamp.
4.1.3 Exhaust air will be vented out the top of the cabinet and door.
A. The exhaust area shall be screened with a material having a maximum hole diameter of 0.125 inch.
4.1.4 The ventilation plenum area shall be equipped with a removable plate with provisions for mounting an optional fan assembly. Note: On NEMA Type 4, 4X and 12 enclosures, all louver air intake vents on the door and air exhaust vents in the roof are deleted.
4.2 The ventilation system will be designed to handle a minimum of 100 cubic feet of air per minute.
5.0 EQUIPMENT MOUNTING
5.1 The enclosures shall be equipped with mounting brackets that accommodate the mounting of a 19" rack frame assembly.
6.0 CABINET FINISH
6.1 Unless otherwise specified, the outside surface of the cabinet shall have a smooth, uniform, natural aluminum finish.
6.2 If painted, the following steps shall be taken as a minimum requirement:
6.2.1 The cabinet door and any other parts to be painted will be treated with an iron phosphate coating conversion technique.
6.2.2 After phosphatizing, the parts shall be baked to eliminate any moisture in seams.
6.2.3 The finishing coat of a polyester powder will be baked at 400-450 degrees F for ten (10) minutes.
6.2.4 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.
7.0 CABINET MOUNTING
7.1 POLE MOUNTED ENCLOSURE
7.1.1 Enclosures intended for pole mounting shall be provided with 0.125 inch thick aluminum stiffener plates, welded to top and bottom of side wall for added strength and rigidity. Note: On NEMA Type 4, 4X and 12 enclosures, all mounting holes are gasketed.
7.2 PEDESTAL MOUNTED ENCLOSURE
7.2.1 Enclosures intended for pedestal mounting shall provided with a reinforced base plate. Note: On NEMA Type 4, 4X and 12 enclosures mounting holes are gasketed.
7.3 PAD MOUNTED ENCLOSURE
7.3.1 Enclosures intended for pad mounting shall be construe with the following pattern:
8.0 APPROVED MANUFACTURER
8.1 Cabinet is to be manufactured by APX Enclosures, lnc. or an approved UL listed equivalent.