1410FEEDER CIRCUITS

FEEDER CIRCUITS -1 DESCRIPTION Furnish and install all conductors and conduit, including tools, equipment, trenching and backfilling to provide electrical circuits at locations shown in the plans. -2 MAT ERIALS Refer to Division 10. Item Section Conduit 1091 -3 Wire and Cable 1091 -2, 1400 -2 Use UL listed, Type USE wire for feeder circuits in conduit. The equipment grounding conductor may be bare or insulated. Use conductors which are copper and in accordance with Subarticle 1400- 2(C). Give careful attention to the required color code. Con ductors may be permanently reidentified per Article 200.7 of the NEC . Provide metallic (rigid galvanized steel) conduit above ground and non- metallic (PVC or HDPE) conduit below ground in accordance with the Subarticle 1400- 2(B) with the appropriate type being used at locations as shown in the plans. -3 CONSTRUCTION METHODS Install feeder circuits in continuous runs . Splicing is only permitted in junction boxes or light standard bases as described in Subarticle 1400- 4(F). Install conductors in accordance with the Subarticle 1400- 4(F) and conduit in accordance with the Subarticle 1400- 4(E). Excavate trenches to depths and widths as shown in the plans with essentially vertical walls and as straight as possible, when underground feeder circuits are required. Locate underground feeder circuits a minimum of 15 feet back from the edge of travel lane or as directed by the Engineer . Use care to prevent conflict with existing or future guardrails, sign posts, delineators and similar devices. Surround the underground feeder circuit in conduit with clean soil and use backfill free of rocks and other objectionable materials which might damage the conduit. This will requi re partial backfilling by hand in areas where it is likely that objectionable materials will be included if mechanical methods of backfilling are used. When a feeder circuit in conduit passes through electrical duct (sleeve) , make the conduit continuous through the duct unless specifically noted otherwise in the plans. When only feeder circuits are required, install the load current carrying conductors and grounding conductors in either existing conduit or conduit installed under other contract items. Whe n more than one feeder circuit is installed in a single raceway, a single equipment grounding conductor sized as required for the largest feeder circuit conductor may be used without change in the contract unit bid prices. Use of a raceway is only permissible under road crossings, unless otherwise indicated on the plans. Multiple feeder circuits in conduit may be placed in the same trench if the conduits are separated a minimum distance of 3 inches . When more than one feeder circuit in conduit is installe d in the same trench there will not be any adjustment of the contract unit bid prices. Feeder circuits must be installed in individual conduits sized as shown on the plans.