Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
J.
Conduit connections to boxes and fittings shall be supported not more than 36
inches from the connection point. Conduit bends shall be supported not more
than 36 inches from each change in direction. Conduit shall be installed in neat
symmetrical lines parallel to the centerlines of the building construction and the
building outline. Multiple runs shall be parallel and grouped whenever possible
on common supports. Exposed ends of conduit without conductors shall be
sealed with watertight caps or plugs.
Bonding wires shall be used in flexible conduit for all circuits. Flexible conduit
shall not be considered a ground conductor.
Liquid tight flexible metallic conduits shall be used in wet and oily locations and
to complete the connection to motor-driven equipment.
Electrical connections to vibration-isolated equipment shall be made with flexible
metallic conduit in a manner that will not impair the function of the equipment.
A polypropylene pull rope with a tensile strength not less than 130 pounds shall
be installed in empty conduit.
Installation of Underground Conduit
1. Minimum of 3/4 inch conduit in or under concrete slab on grade.
2. Where conduits are installed in concrete slabs, on the ground,
underground, or exposed to the weather, make all joints liquid tight and
gas tight.
3. Bury all underground conduit, except under concrete slabs placed on fill,
to a depth of at least 30 inches below finished grade unless otherwise
indicated on the Drawings.
4. Slope ducts to drain away from buildings into manholes and/or handholes.
Adjust final slopes to coordinate with existing site utilities.
5. Install on undisturbed soil where possible. . Use pit run gravel and sand,
placed 8 inch lifts and compacted for backfill.
6. Reference Specification 26 05 43 UNDERGROUND DUCTS AND
RACEWAYS FOR ELECTRICAL SYSTEMS for further requirements.
Installation of Rigid Metal Conduit
1. Ends of conduit shall be cut square, reamed and threaded, and joints shall
be brought butt-to-butt in the couplings. Joints shall be mechanically
tight. Conduit shall be protected against damage and the entrance of water
or foreign material during construction.
RACEWAYS, BOXES AND SUPPORTING DEVICES
WOODARD & CURRAN 26 05 34-10
