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r—: SECTION 630 CONDUIT ar 630-1 Description. Install conduit for traffic signals and other electrically powered or operated traffic control r devices as shown in the plans and Design Standards, Index No. 17721. 630-2 Materials. r Use materials meeting the requirements of Section A630 of the current Minimum Specifications for Traffic Control Signal Devices (MSTCSD), except as provided in 603-2.2. No 630-3 Installation Requirements. 630-3.1 General: Consider the locations of conduit as shown on the plans as approximate. Construct conduit runs as straight as possible, and obtain the Engineer's approval w of all major deviations in conduit locations from those shown on the plans. Do not place more than the equivalent of four quarter bends or 360 degree of bends, including the termination bends, between the two points of termination in the conduit, r without a pullbox. Obtain the Engineer's approval to use corrugated flexible conduits for short runs 6 feet or less. Use only intermediate metal conduit, rigid galvanized conduit, rigid aluminum it conduit or PVC coated intermediate metal conduit for above -ground or underground electrical power service installations. Meet the requirements of Section 562 for coating all field cut and threaded galvanized pipe. r Use either schedule 80 PVC or fiberglass reinforced epoxy conduit for installations on bridge decks. Use either schedule 40 PVC or fiberglass reinforced epoxy, conduit for r underground and under pavement installations, except for electrical power service. When the installation of a conduit requires jacking under paved surfaces, railroads, etc., use an intermediate metal conduit as the sleeve for the underground conduit. r. Install the underground conduit as shown in the Design Standards, Index No. 17721. When a conduit installation changes from underground to above -ground, make the change a minimum of 6 inches below finished grade. r Install a No. 12 AWG pull wire or polypropylene cord the full length of all conduits that are designated for future use. Ensure that a minimum of 24 inches of pull line approved by the Engineer is accessible at each conduit termination. w Install an expansion fitting when conduit crosses an expansion joint of a structure. Use couplings and expansion joints made of the same material as the conduit. Ensure that all joints are made as specified by the manufacturer and are waterproof. For installations not specifically shown, install the conduit in accordance with NEC and/or National Electrical Safety Code requirements. When earth backfill and tamping is required, place backfill material as per Section 120 in layers approximately 12 inches thick, and tamp each layer to a density equal to or greater than the adjacent soil. +' When trenching, saw cut and repair all pavement and sidewalks encountered.