Res 1990-111 - Laserfiche WebLink

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134 RAMON LUCIO, RIO VISTA, RIO VISTA ANNEX, AND BICENTENNIAL PARKS RECREATION DEVELOPMENT TECHNICAL SPECIFICATION 9 ELECTRICAL WORK - GENERAL ceilings, with right-angle turns consisting of cast-metal fittings or symmetrical bends. Bends and offsets shall be avoided where possible, but where necessary shall be made with an approved hickey or conduit-bending machine. Conduit or tubing which has been crushed or deformed in any way shall not be installed. Expansion fittings or other approved devices shall be used to provide for expansion and contraction where conduit crosses expansion joints. Wooden plugs inserted in masonry or concrete shall not be used as a base to secure conduit or tubing supports. Conduit or tubing shall be supported by approved types of wall brackets, ceiling trapeze, strap hangers, or pipe straps. Supports shall be secured with fasteners, appropriate to the type of construction encountered, as follows: to wood with wood screws¡ to hollow masonry units with toggle bolts¡ to solid masonry and concrete with expansion bolts or threaded studs driven in with a powder charge; to metal surfaces with machine screws, threaded studs driven in with a powder charge, or threaded studs welded to the metal. Nails shall not be used as the means of fastening boxes or conduits. Conduits or tubing shall be installed in such manner as to insure against trouble from the collection of trapped condensation and all runs of conduit or tubing shall be arranged so as to be devoid of traps wherever possible. The Contractor shall exercise the necessary precautions to prevent the filling of dirt, mortar, or trash in conduit, fittings, and boxes during the course of installation. A run of conduit or tubing which has become clogged shall be entirely freed of these accumulations or shall be replaced. Conduit or tubing shall be securely fastened to all sheet metal outlet junction, pull boxes and metal wireways with two galvanized locknuts and a. bushing, care being observed to see that the full number of threads project through to permit the bushing to be drawn tight against the end of conduit, and the internal locknut backed up against the bushing after which the external locknut shall be made up sufficiently tight to draw the internal locknut into firm electrical contact wi th the box or wireway. Bushings having inserts of insulating material or constructed wholly of insulating material shall be used where required. The installation shall meet the requirements specified above and, in addition, the conduit shall be installed 80 that the approximate maximum length of a run for 1/2 and 3/4 inch conduit is 15 feet, and for 1 inch conduit is 150 feet. No more than the equivalent of 9-4