SECTION 16190 SUPPORTING DEVICES
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 equipment for the support of electrical equipment as detailed or indicated on the drawings and as specified herein.
1.3 QUALITY ASSURANCE
A. Reference standards of the following agencies;
1. National Electrical Contractors Association (NECA), Standard of Installation.
2. National Electrical Manufacturers Association (NEMA).
3. American National Standards Institute (ANSI).
PART 2 PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A. Kindorf, Midland-Ross Corp.
B. Elcen Co.
C. Steel City, Midland-Ross Corp.
D. Unistrut
E. B-Line
2.2 GENERAL
A. Metal supporting devices shall be zinc galvanized or cadmium plated steel or malleable iron.
2.3 LIGHTING FIXTURE SUPPORT
A. Items such as stems, hickeys, bar hangers, and clips are required to securely attach fixtures to ceilings or walls.
B. Provide studs and unistrut support for fixture outlet and ceiling support.
C. Provide fixture grid hangers for mounting surface fluorescent units to exposed grid ceiling.
D. Drilled expansion insert type anchors are suitable for load and application requirements such as sleeve anchors, lag shields, and plastic anchors.
E. Provide auxiliary supports so that fixtures can be drawn up tightly, cannot be tilted or rotated, and will not be affected by vibrations.
2.4 SUPPORT STRUCTURES
A. Rack supports of galvanized steel channel sections with adequate feet to allow secure mounting.
B. Weld sections, do not use bolts.
2.5 MOUNTING PANELS
A. Size mounting panels to mount necessary equipment, of ¾ in. exterior grade plywood or as specified on drawings.
B. Provide mounting panels for all surface mounted electrical cabinets and enclosures for electrical equipment.
C. Provide uniform mounting panels as far as practical. Preferred sizes being 12 in. X 18 in., 18 in. X 24 in., 18 in. X 30 in., and 24 in. X 30 in.
2.6 CONDUIT SUPPORTS
A. Two hole galvanized steel straps.
B. Continuous slot or T-slot galvanized steel concrete insert channel.
2.7 TRANSFORMER MOUNTING BRACKETS
A. Provide mounting brackets fabricated of welded galvanized steel channel section.
B. Design bracket to support the size transformer as indicated on drawings.
PART 3 EXECUTION
3.1 PREPARATION
A. Install hangers, supports, and anchors only after structural work, where work is to be installed, has been completed. Correct inadequacies such as proper placement of inserts, anchors, and other building structural attachments.
B. Examine areas and conditions under which equipment and associated components are to be installed and notify Engineer, in writing, of conditions detrimental to proper and
timely completion of work. Do not proceed with work until unsatisfactory conditions have been corrected.
C. Determine that ceiling channel system is adequately supported to receive and support lighting fixtures. Where deemed inadequate, do not install fixtures until additional support is provided.
3.2 LIGHTING FIXTURES
A. Install channel supports across main grid runners or grid supports, securely tied down or anchored for fixtures and devices mounted in suspended ceiling systems so as not to cause tile to sag and so that fixture or device cannot be lifted, rotated, or displaced. Provide additional support of ceiling grid or tees at those locations where tiles and ceiling grid sags.
B. Install grid troffer support clips in accordance with NEC 410-16(c).
3.3 INSTALLATION OF BUILDING ATTACHMENTS
A. Install building attachments at required locations within concrete or on to structural steel or raceway and equipment support.
B. Install additional building attachments where support is required for additional concentrated loads.
C. Install concrete inserts before concrete is placed.
3.4 INSTALLATION OF ANCHORS
A. Install anchors at proper locations to prevent stresses from exceeding those permitted by ANSI B31 and to prevent the transfer of loading and stresses to connected equipment.
B. Installation methods shall be in conformity with the manufacturer's recommendations for maximum holding power, but in no case shall the depth of hole be less than four bolt diameters. Minimum distance between the center of any expansion anchor and an edge of exterior corner of concrete shall be not less than 4½ times the diameter of the hole in which it is installed.
3.5 SUPPORT OF CONDUIT
A. Fasten conduit to structural parts of building in a manner acceptable to Engineer.
B. Do not use perforated hanger iron.
C. Install concrete insert channel as required, with spacings as recommended by manufacturer. Install with anchor and caps, insert joiner clips and closer seals as required.
D. Support conduit as follows;
1. Single Conduit Runs
a. Vertical Surfaces: Galvanized, heavy duty, sheet steel straps; back straps to be provided for all exposed conduit and conduit on exterior walls.
b. Horizontal Surfaces: Galvanized, heavy duty, 2-hole steel pipe straps.
2. Multiple Conduit Runs
a. Vertical Surfaces: Horizontal or vertical rack channel with conduit straps as required.
b. Horizontal Surfaces: Single or double rack channel trapeze, complete with conduit straps as required; all supported with threaded hanger rods.
3. Passing Between Floors and Through Roof 1¼ in. and larger conduit runs passing through floors shall be supported at each floor with riser pipe clamps.
4. Conduit extending through roof shall pass through a ceiling box at roof lines.
5. Provide 14 ga minimum copper box complete with watertight soldered seams and flanged to serve as pitch pocket for each conduit.
6. Conduit and pitch pocket shall be installed in advance of roofing work.
3.6 TRANSFORMER SUPPORTS
A. Install auxiliary transformer wall mounting brackets where all mounted transformers are indicated on drawings.
END OF SECTION
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