specifications - FAACO - Federal Aviation Administration Contract ...

PART 3.00EXECUTIONFTWIC-2235June 20093.01 INSTALLATION:A. Size conduits as required by the NEC for the number and sizes of wires to be drawn intothe conduit. Conduits less than 3/4" shall not be used unless specified otherwise.B. Install the conduit at elevations which maintain headroom and at locations which avoidinterference with other work requiring grading of pipe, the structure, finished ceiling,walls, etc. Avoid crossing other work. Do not place the conduits in close proximity toequipment, systems and service lines, such as the hot water supply and return lines orsteam pipes which could be detrimental to the conduit and its contents. Maintain aminimum of 3" separation, except in crossing, which shall be a minimum of 1".C. Prevent displacement by securely supporting the conduit which is to be concealed andinstalled in advance of other work. Carefully layout all conduit installed within thestructure, such as in floors, beams and walls to avoid densities excessive for theconstruction.D. Cut the conduit square with a saw. Ream, deburr and swab the inside of the conduitbefore installing the conductors. Make bends and offsets in 1" and smaller conduit withapproved bending devices. Use a hydraulic, one-shot conduit bender or factory elbowsfor bends in conduit larger than 1". Use conduit bodies to make sharp changes indirection around ground beams. Install no more than four 90 degree bends betweenboxes.E. Where space conditions prohibit the use of standard elbows, use cast ferrous alloy fittingsto match the conduit construction. "Condulet" type fittings shall not be used on conduitcontaining #4 or larger wire.F. Make conduit joints mechanically tight and electrically continuous between enclosuressuch as outlet, junction and pull boxes, panels, cabinets, etc. Pitch the conduit in areaswhere moisture may be present to avoid creating moisture traps. Where indicated ornecessary to prevent accumulation of water in the conduit, provide a junction box with adrain fitting at the conduit system's low point.G. Install insulated throat threaded hubs on conduit entering enclosures without threadedhubs. Connect and couple electric, metallic tubing with compression type fittings.H. Group the conduit in parallel runs where practical and use a conduit rack constructed ofsteel channels with conduit straps or clamps. Provide space for an additional 25 percentconduit. Do not install exposed, diagonal conduit runs. Changes in direction of runsshall be made with symmetrical bends or cast-metal fittings. Field-made bends andoffsets shall be made with an approved hickey or conduit-bending machine. Crushed ordeformed raceways shall not be installed. Care shall be taken to prevent the lodgment ofplaster, dirt, or trash in raceways, boxes, fittings and equipment during the course ofconstruction. Clogged raceways shall be entirely freed of obstructions or shall bereplaced.16111-4 FTWIC-2034