Specifications - City of Montpelier, Vermont

Title:16110 – RacewaysMontpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Page #:8 of 10J. Install exposed raceways parallel and perpendicular to nearby surfaces orstructural members and follow the surface contours as much as practical. Runexposed, parallel, or banked raceways together. Make bends in parallel or bankedruns from the same center line so that the bends are parallel. Factory elbows maybe used in banked runs only where they can be installed parallel. This requiresthat there be a change in the plane of the run such as from wall to ceiling and thatthe raceways be of the same size. In other cases provide field bends for parallelraceways.K. Join raceways with fittings designed and approved for the purpose and makejoints tight. Where joints cannot be made tight, use bonding jumpers to provideelectrical continuity of the raceway system. Make raceway terminations tight.Where terminations are subject to vibration, use bonding bushings to assureelectrical continuity. Where subject to vibration or dampness, use insulatingbushings to protect conductors.L. Prior to locating and installing conduits, check the Contract Drawings and thework of other trades to be sure that the locations of all conduits and boxes will notinterfere with the work of other trades and that conduit stubs for motors andequipment will be placed in proper locations.M. There shall be separate raceway systems for all voltages and system types. Allwiring shall be in raceway systems.N. Holes through existing concrete walls, for conduit installation, shall be made witha core drill.O. All raceways penetrating walls shall be sealed on both sides with approved sealantmaterial.P. Hanger rods for supporting raceway shall be allthread galvanized rod. Minimumsize rod shall be 1/4 inch, use larger rods where required for supporting loadsheavier then recommended for 1/4 inch rods.Q. Raceways shall be fastened with malleable iron beam clamps or stamped steel ormalleable iron onehole straps, or “minerallac” type conduit hangers. Spring steelfasteners as manufactured by Cady or approved equal, may be used in stud wallsand above ceilings.R. Perforated strap hangers are not permitted.RACEWAYS161108