shall be attached to all controller and detector cabinet wiring to identify circuit and associated phase. Sequence color need not be identified if clearly indicated by conductor insulation color. Wiring diagrams, detailing on one sheet all wires in the controller cabinet that are external to the controller itself, must be included with all signal systems. The diagrams must be complete and show all connections including switches, terminal block, connectors, relays and all other mechanisms in the cab inet. Other wiring for the controller shall be as required by the wiring diagrams and instructions furnished with the controller by the manufacturer. Connection to each terminal of a pedestrian push button shall be by # 14 AWG single conductor in two -wire IMSA cable as required. The neutral for pedestrian push button circuits shall be separate from the signal light circuit neutral. Pedestrian push button circuits shall be limited to 12 volts AC or DC. Conductors shall be pulled into conduit by hand. Th e use of winches or other power actuated pulling equipment will not be permitted. Powdered soapstone, talc, or other inert lubricants shall be used in placing conductors in conduit. When conductors are to be added to existing conductors in a conduit, all conductors shall be removed; the conduit shall be cleaned as provided in 660.14, and both old and new conductors shall be pulled into the conduit as a unit. Where signal conductors are run in lighting standards containing high -voltage series street lighting conductors, either the signal conductors or the lighting conductors shall be encased in flexible or rigid metal conduit, to a point where the two type of conductors are no longer in the same raceway. Where telephone circuits are installed adjacent to signal and lighting circuits, the telephone conductors shall be encased in UL approved flexible metal conduit. All wiring shall be installed in a neat and workmanlike manner. Conductors within fixtures or cabinets shall be cabled together with self clinching nylon cable ties, waxed lacing or other method permitted by the Engineer. Wiring within the controller cabinet shall be firm, neatly arranged and laced, or enclosed in plastic tubing or raceways. The finished wiring shall present a neat, clean appearance so that individual wires may be easily traced to their terminal points. Unnecessary slack in the conductor wires will not be permitted. Wiring workmanship shall be subject to the approval of the Engineer. The ends of wires which are to be attached to terminal blocks of the barrier screw type shall be provided with solderless terminals that meet the requirements of the National Electrical Code. These terminals shall be the pre -insulated positive grip type. The terminal crimping tool shall produce a transverse crimp on the wire. Wires which insert into a positive wire insert type terminal block will not require terminals. No more than two conductors shall be brought to any one terminal. On all pin and receptacle type connections, the receptacle sh all be on the line side of the circuit. Conductor splices may be permitted only in the following types of circuits at the following locations:
ii. In modified traffic signal systems where shown on the Plans (low voltage only).
Splices, where permitted, may only be made at points of access in conductor runs or raceways (handholes, junction boxes, etc.) and no splices shall be permitted in controller cabinets. All spli ces, with or without connectors, shall be soldered by the pouring or dipping method, except that soldering of pressure connectors and terminals may be omitted provided the connectors and terminals are applied with the proper type tool as recommended by the manufacturer of the connector or terminal being applied. Finished connections and terminals shall comply with the
641 requirements of Military Specification MIL -T-7928. Splices shall be insulated by one of the following methods:
to form a moisture resistant joint. The resin shall be resistant to weather, with aromatic, straight chain solvents, and shall not sustain combustion. The resin shall be cured into molds of dimensions suitable for the splice. ii. A minimum of two thicknesses of electrical insulating pad, composed of a laminate of 0.085 -inch thickness of electrical grade polyvinyl chloride and a 0.125 -inch thickness of butyl splicing compound with removable l iner. Pads shall be applied to the splice in accordance with the manufacturer's recommendations. The ends of the applied pad shall be wrapped with the polyvinyl chloride tape half lapped over the conductor insulation. iii. Heat shrinkable insulating tub ing shall be applied after completing the splicing procedure shown on the Plans. Insulation over the connector shall consist of a heat shrinkable, mastic lined, heavy wall polyolefin cable sleeve or cover, to which heat shall be applied at a temperature g reater than 120EC until the sleeve or cover shrinks and covers the connector, and the mastic material has flowed completely around the cable to form a waterproof insulation.
Electrical tape shall be UL approved and be one of the following types:
ii. Pressure sensitive, adhesive, polyvinyl chloride, 0.007 inch minimum thickness.
Where polyvinyl chloride tape is used for a final layer, an electrical insulating coating shall be used which sha ll be fast drying, resistant to oil, acids, alkalies and corrosive atmospheric conditions and compatible with the tape. All splices shall be noted on the Plans and approved by the Engineer. Unless otherwise specified, shown on the Plans or directed by th e Engineer all signal system conductors shall run continuous and unspliced from terminal to terminal. Signal system conductors shall include but not be limited to power service wires, signal circuit conductors, controller panel wiring, controller wire harness, loop lead -in and loop wire. System interconnect cable shall be continuous and unspliced from controller cabinet terminal to controller cabinet terminal.
660.17POWER SERVICE :
The power connection shall be made to a single -phase 120/240 volt, three -wire, 60Hz, AC supply. The approximate location of utility service points may be shown on the Plans; however, the Contractor shall determine the exact location of the power supply. Each signalized intersectio n or control unit shall have a separate power service and no more than one power service shall be utilized per intersection or unit. Electrical service installation and materials shall conform to the requirements of the serving utility. The service equipment shall be installed as soon as possible to enable the utility to schedule work well in advance of the completion of the project. Enclosed circuit breakers, external to the controller cabinets, shall be provided in the power service. Four single -pole breaker units rated at 30 amps each are required. The breaker enclosure shall be weathertight with a top hinge cover, hasp for sealing cover and provisions for padlocking the cover. The Contractor shall provide an all -weather padlock and two sets of keys with each power service. Circuit breakers shall be approved and listed by the Underwriter's Laboratory.