SECTION 16130 ELECTRICAL BOXES
PART 1 GENERAL
1.1 RELATED REQUIREMENTS
A. Applicable requirements of Division 0 and Division 1 shall govern work in this Section.
1.2 SCOPE
A. Provide electrical boxes in accordance with these specifications.
1.3 QUALITY ASSURANCE
A. Reference Standards of the National Electrical Contractors Association (NECA), Standard of Installation.
PART 2 PRODUCTS
2.1 INTERIOR WALL OUTLET AND SWITCH BOXES - FLUSH MOUNTED IN FINISHED SPACES
A. Stamped steel, four inch square, 2-1/8" deep minimum, with square corners. Provide with raised device rings, height as required for wall finish thickness. Mounting accessories as required. Larger width boxes as required for ganging requirements indicated on plans.
2.2 INTERIOR WALL OUTLET AND SWITCH BOXES - SURFACE MOUNTED - DRY LOCATIONS ONLY
A. Stamped steel, four inch square, 2-1/8" deep, with round corners. Provide rounded corner raised box covers with openings as required for devices being installed. Refer to section 16111 for restrictions on exposed conduit systems.
2.3 INTERIOR WALL OUTLET AND SWITCH BOXES - SURFACE MOUNTED - DAMP OR WET LOCATION (includes areas with floor drains)
A. Single or two gang as indicated on the plans. Cast malleable iron with threaded conduit hubs. Two inches deep minimum. Internal mounting ears. Boxes shall be coated with electroplated zinc, a dichromate coating, and an aluminum polymer enamel finish. Refer to section 16111 for restrictions on exposed conduit systems.
2.4 EXTERIOR WALL OUTLET AND SWITCH BOXES - SURFACE MOUNTED
A. Single or two gang as indicated on the plans. Cast malleable iron with threaded conduit hubs. Two inches deep minimum. Internal mounting ears. Boxes shall be coated with electroplated zinc, a dichromate coating, and an aluminum polymer enamel finish. Refer to section 16111 for restrictions on exposed conduit systems.
2.5 CEILING BOXES - FLUSH MOUNTED - FOR SURFACE AND PENDANT LIGHT FIXTURES; DRY AREAS ONLY
A. Dropped ceiling construction. Stamped steel four inch octagon box set flush with finished surface, complete with 3/8 in. fixture stud.
B. Cast in place concrete construction. Stamped steel four-inch octagonal, galvanized concrete boxes, having a minimum depth of 3 in., complete with 3/8-in. fixture stud.
2.6 CEILING BOXES - SURFACE MOUNTED – DAMP AND WET AREAS
A. Single or two gang as indicated on the plans. Cast malleable iron with threaded conduit hubs. Two inches deep minimum. Internal mounting ears. Boxes shall be coated with electroplated zinc, a dichromate coating, and an aluminum polymer enamel finish. Refer to section 16111 for restrictions on exposed conduit systems.
2.7 ELECTRICAL BOXES IN CORROSIVE LOCATIONS
A. PVC coated cast steel boxes compatible with conduit system installed. Coating shall cover both interior and exterior surfaces. See floor plans for identification of corrosive areas.
2.8 SPECIAL BOXES
A. Provide special boxes fabricated by the manufacturer of fixtures and other devices where standard outlets are not applicable.
2.9 GENERAL PURPOSE JUNCTION AND PULL BOXES (FOR DRY INTERIOR AREAS ONLY)
A. Fabricate from code gauge galvanized steel, with covers held in place by corrosion resistant machine screws
B. Size as required by code for number of conduits and conductors entering and leaving box.
C. Provide with welded seams, where applicable, and equip with corrosion-resistant nuts, bolts, screws, and washers.
2.10 ACCESS PANELS
A. Furnish type necessary for the particular wall or ceiling construction in which they occur.
B. Panels to be complete with screwdriver cam locking device.
2.11 WEATHERPROOF JUNCTION AND PULL BOXES (EXTERIOR AND DAMP/WET INTERIOR AREAS)
A. Stainless steel or cadmium plated malleable iron cast type with threaded hubs, cast cover, and neoprene gasket.
2.12 EXPLOSION-PROOF JUNCTION BOXES
A. Provide explosion-proof junction boxes for classified areas as indicated on the plans.
2.13 BETWEEN STUD BOX SUPPORT BRACKETS
A. Stamped and fabricated steel bracket designed to support 4" or 4-11/16" electrical boxes between wall studs.
B. Manufactured by Erico, RBS series or equivalent.
PART 3 EXECUTION
3.1 INSTALLATION
A. Install electrical boxes as indicated, in compliance with NEC requirements, in accordance with the manufacturer's written instructions and with recognized industry practices to ensure that the boxes serve the intended purposes.
B. Seal conduit at entrance to weatherproof boxes for interior and exterior locations exposed to weather or moisture.
C. Install knockout closures to cap unused knockout holes where blanks have been removed
D. Locate boxes so as to assure accessibility of electrical wiring. Relocate boxes rendered inaccessible by the installation of work by other trades.
E. Secure boxes rigidly to the substrate upon which they are being mounted, or solidly embed boxes in concrete or masonry. Do not support from conduit.
F. Set boxes, in concealed conduit runs, flush with wall surfaces, with or without covers, as required.
G. Do not install boxes back to back or through wall. Offset outlet boxes on opposite sides of wall a minimum 12 inches.
H. Set outlet boxes parallel to construction, securely mounted and adjusted to set true and flush with the finished surface.
I. Do not burn conduit holes, use knock-out punches, or hole saws.
J. Use "no-bolt" studs where required.
K. Use handy boxes only where specifically detailed on the drawings.
L. Boxes shall be sized per code to accommodate the number and size of conduit entrances to the box and to accommodate the number of conductors, splices, fittings, etc. within the box. Do not use box extensions to create additional volume to meet NEC requirements for the number of conductors contained in a box.
3.2 EXPOSED OUTLET AND JUNCTION BOXES
A. Install weatherproof outlet and junction boxes outdoors and in any area where drawings show weatherproof (WP) wiring devices.
3.3 INTERIOR OUTLET BOX ACCESSORIES
A. Provide outlet box accessories as required for each installation, such as mounting brackets, wallboard hangers, extension rings, fixture studs, cable clamps, and metal straps for supporting outlet boxes, compatible with outlet boxes being used and meeting requirements of individual wiring situations.
3.4 LIGHTING FIXTURE OUTLET BOXES
A. Securely mount with approved type bar hangers spanning structural members to support weight of fixture.
B. Do not support from conduit.
C. Equip with 3/8-inch fixture studs and tapped fixture ears, for surface mounted or pendant mounted lighting fixtures. Fixture studs shall be provided for mounting of all lighting fixtures exceeding 25 lbs. in weight. Fixture studs shall be attached through knockouts at the top of the box.
D. Provide additional attachments from structure for outlet boxes supporting lighting fixtures weighing in excess of 25 lb.
E. Provide cast outlet boxes for lighting fixtures in wet or damp areas.
3.5 OUTLET BOX LOCATIONS
A. Locate flush mounted wall boxes in corner of nearest brick or block to keep cutting to a minimum.
B. Location of outlets and equipment as shown on drawings is approximate, and exact location is to be verified and shall be determined by:
C. Construction or code requirements.
D. Conflict with equipment of other trades.
E. Equipment manufacturer's drawings.
F. Where receptacles and communications outlets are shown grouped next to each other on the drawings, the boxes for these outlets shall be mounted next to each other and shall not be located according to stud spacing. The Contractor shall utilize between stud box supports to assist in mounting boxes proximal to one another on a consistent spacing between wall studs.
G. Minor modification in the location of outlets and equipment is considered incidental up to a distance of 10 feet, provided the change in location is requested prior to rough in.
H. Mounting heights for devices and equipment to be measured from finished floor to centerline of device.
3.6 FLOAT SWITCH CABLE JUNCTION BOXES
A. Provide a NEMA 4X junction box for each group of float switches shown on the drawings. Provide each junction box whether the box is shown on the drawings or not. It is required to enable transition from waterproof float switch cable, to wire in conduit.
B. Install each junction box above the liquid level in an accessible location enabling future access.
C. Each penetration to each junction box shall be made in a manner that maintains the NEMA 4 integrity of the box. Refer also to section 16112 (Conduit Fittings).
3.7 SUBMERSIBLE PUMP/MIXER CABLE JUNCTION BOXES
A. Provide a NEMA 4X junction box for each submersible pump shown on the drawings. Provide each junction box whether the box is shown on the drawings or not. It is required to enable the separation of the moisture detection conductors and the high temperature conductors from the pump’s power conductors. It is also required to enable transition from (waterproof) pump/mixer cable, to wire in conduit.
B. Install each junction box above the liquid level in an accessible location enabling future access.
C. Each penetration to each junction box shall be made in a manner that maintains the NEMA 4 integrity of the box. Refer also to section 16112 (Conduit Fittings).
END OF SECTION
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