specifications - FAACO - Federal Aviation Administration Contract ...

FTWIC-2235June 2009E. Boxes and supports shall be fastened to wood with wood screws, nails, or screw-typenails of equal holding strength, with bolts and expansion shields on concrete or brick,with toggle bolts on hollow masonry units, and with machine screws or welded studs onsteel work. Nail-type nylon anchors may be used in lieu of expansion shields, or machinescrews. In open overhead spaces, cast-metal boxes threaded to raceways need not beseparately supported except where used for fixture support. Sheet metal boxes shall besupported directly from the building structure or by bar hangers. Where bar hangers areused, the bar shall be attached to raceways on opposite sides of the box and the racewayshall be supported with an approved fastener not more than 24 inches from the box.Penetration shall be no more than 1-1/2 inches into reinforced concrete beams nor morethan 3/4 inch into reinforced concrete joists. Main reinforcing steel shall not be cut.3.02 INSTALLATION:A. Do not install boxes back-to-back in walls. Provide minimum 6" horizontal separation,except provide minimum 24" separation in acoustic-rated walls.B. Locate boxes in masonry walls to require cutting of masonry unit corner only.Coordinate masonry cutting to achieve neat openings for boxes.C. Provide knockout closures for unused openings.D. Use multiple-gang boxes where more than one device is installed together; do not usesectional boxes. Provide barriers to separate wiring of different voltage systems.E. Install boxes in walls without damaging wall insulation.F. Coordinate mounting heights and locations of outlets mounted above counters, benchesand backsplashes.G. Position outlets to locate luminaries as shown on reflected ceiling plans.H. In inaccessible ceiling areas, position outlets and junction boxes within 6" of recessedluminaries, to be accessible through luminaire ceiling opening.I. Provide recessed outlet boxes in finished areas; secure boxes to interior wall and partitionstuds, position to allow for surface finish thickness. Use stamped steel stud bridges forflush outlets in hollow stud wall, and adjustable steel channel fasteners for flush ceilingoutlet boxes.J. Align wall-mounted outlet boxes for switches, thermostats and similar devices.K. Do not fasten boxes to ceiling support wires.L. Install boxes to preserve the fire resistance rating of the partitions and other elements,using materials and methods under the provisions of Section 07270, FIRESTOPPING.END OF SECTION16130-3