639 replacement operation, shall be performed according to Standard Detail TES -04. Concrete shall be allow ed to set for a minimum of 49 hours without being exposed to traffic. At no time shall more than one -half of the roadway be closed for any conduit placement operations. Conduit to be placed beneath railroad tracks shall comply with the following: The co nduit shall be rigid metal type, two ( 2) inches minimum size and shall be placed to a minimum depth of five ( 5) feet below the bottom of the tie. The near side of each conduit jacking pit shall be constructed not less than twelve ( 12) feet from the center line of track. When the jacking pit is to be left overnight it shall be covered with substantial planking.
660.15 Junction Boxes :
Junction boxes shall be installed at the locations shown on the Plans or, in long runs, they shall be spaced at not over 200 feet intervals. The Contractor may, at his own expense and with the approval of the Engineer, install additional junction boxes to facilitate his work The tops of junction boxes installed in the ground or in sidewalk areas shall be flush with the surrounding grade or pavement. Concrete junction boxes shall be poured in place. However, pre -cast junction boxes may be used, when in the opinion of the Engineer, the surrounding subgrade has sufficien t bearing qualities to support the box and cast iron frame. All junction boxes shall be set on at least twelve ( 12) inch bedding of aggregate base material as shown on the Plans. Grouting shall be done prior to the installation of conductors. No junctio n boxes shall be set on uncompacted ground. Concrete work shall be done in accordance with the applicable requirements of subsection 660.8. The Contractor shall be responsible for reconstruction and/or replacement of all damaged junction boxes. Damage junction boxes shall be defined as any junction box more than two (2) inches below grade, or is covered by the area roadway surface. The adjustment of the junction box shall include the complete excavation and shall conform to Specifications, Secti on 660.8 and 660.15. All conduit, cable and attached appurtenances shall be incidental to this junction box. The adjustment of the junction box shall be as per detail and shall conform to Specifications Section 660.8 and 660.15.
660.16 Wiring :
Sufficient five -conductor signal light cables shall be provided to perform the functional operation of the signal system and, in addition thereto, one spare conductor of a size equal to the largest signal light conductor in th e run, except neutral, shall be provided throughout the signal light system. No more than two signal heads shall be on the same conductor run. When two signal heads are on the same conductor run, they must be of the same signal color sequence. All signa l light conductors shall be run continuously without splices from the terminal block located in a cabinet, compartment, or signal head, to a similarly located terminal block, unless otherwise specified on the Plans. Signal light conductors shall not run t o a terminal block on a standard unless they are to be connected to a signal head that is mounted. All spare wires shall be placed on a special terminal block mounted in the controller cabinet for this purpose. Five-conductor IMSA cable as specified shal l be provided for all signal light circuits. This cable shall consist of red, orange, green, black and white insulated wires. The insulation color shall correspond as nearly as possible to the associated signal sequence color.