637 20. Total harmonic distortion, current and voltage, induced into an ac power line by a signal module shall not exceed 20 percent (20%) , over the operating voltage range specified in Section 14 and wi thin the ambient temperature range specified in Section 4.
21.The signal module on -board circuitry shall include voltage surge protection to withstand high -repetition noise transients and low -repetition high -energy transients as stated in Section 2.1.6.NEMA S tandard TS -2, 1992.
22.The L.E.D. signal module shall operate from a 60+/ -3 Hz ac line over a voltage range from 80 Vac to 135 Vac, drawing a minimum of 100 mA rms over the entire voltage range. Load switches shall be compatible with NEMA TS -1 or later.
23.All L.E.D. signal modules shall be energized for a minimum of 24 hours, at 100 percent (100%) on-time duty cycle, in an ambient temperature of 60 °C.
24.Manufacturers shall provide a Certificate of Compliance to this specification for each shipment of L.E.D. sign al modules to an end user. Each L.E.D. signal module shall be identified with a serial number.
25.Warranties shall include the replacement or repair of an L.E.D. signal module that fails to function as intended due to workmanship or material defects within t he first 60 months from the date of delivery. Also, replacement or repair of L.E.D. signal modules that exhibit luminous intensity of less than the minimum values specified in Table 1 of ITE August, 1997, draft specification within the first 36 months fro m the date of delivery.
660.11 Cabinets :
The cabinets for all types of traffic controllers or flasher units shall be mounted and installed at the location shown on the Plans and in accordance with typical installat ion details. No mounting holes or special outlets shall be made through the cabinet walls without the specific approval of the Engineer. Adjustable steel bands or universal cabinet mounting bands shall not be used for mounting cabinets to poles or pedestals. Cabinets mounted on wood poles shall be attached with wood pole mounting brackets, secured with lag screws.
660.12 Support Structures :
Strain and mast -arm poles shall be installed with the amo unt of rake recommended by the pole manufacturer. The rake shall assure a substantially vertical set when the load is applied. For anchor base type poles, threaded adjusting nuts shall be used to establish the rake. The use of shims or other leveling de vices is not permitted. Hardware and fittings shall be installed as shown on the manufacturer's installation drawings. When embedded or wooden poles are used, the rake shall be established as the pole is set. Pedestal poles supporting only a vertical de ad load shall be installed in a true vertical plane. The Contractor shall take full responsibility for checking all cross sections to determine final support lengths.
660.13 Messenger Cable :
When completely loaded the messenger cable, cable rings and conductor wire shall present a straight, clean, neat appearance. Excessive slack shall be pulled out of conductor wire and the ring supports shall be set at fifteen ( 15) inch centers. Span wire sag shall be kept at a practical minimum and in no case exceed five percent (5%) of the span. 638 660.14 -CONDUIT : Conduit runs shown on the Plans may be changed to avoid underground obstruct ions with the written approval of the Engineer. Approximate lengths of conduit are shown on the Plans. The Contractor shall determine the exact lengths of conduit in the field. The ends of all conduits, whether shop or field cut, shall be reamed to remo ve burrs and rough edges. Cuts shall be made square and true so that the ends will butt or come together for the full circumference thereof. Standard conduit couplings shall be used for joining all metal conduit. Slip joints or running threads will not be permitted for coupling conduit. However, expansion fittings shall be installed where the conduit crosses an expansion joint on a structure. Continuity through the expansion fitting shall be provided by means of # 6 AWG copper wire jumper. Conduit run s on the surface of structures shall be secured with galvanized malleable iron clamps spaced not more than five ( 5) feet apart. The threads on all ferrous metal conduit shall be painted with rust preventative paint before couplings are made up. All coupl ings for metal -type conduit shall be tightened until the ends of the conduit are brought together, providing a good electrical connection throughout the entire length of the conduit run. Where the coating on metal conduit has been damaged in handling or installing, such damaged places shall be painted with an approved rust preventive paint. Exposed ungalvanized threads on metal conduit resulting from field cuts shall be painted with an approved rust preventative paint. All metal -type conduit ends shall b e threaded and shall be capped with a standard pipe caps until wiring is started. When caps are removed, the threaded ends shall be provided with conduit bushings. Conduit bends, except factory bends, shall have a radius of not less than six times the in side diameter of the conduit. Where factory bends are not used, conduit shall be bent, without crimping or flattening, using the longest radius practicable. A # 12 AWG galvanized pull wire shall be installed in all conduits which are to receive future co nductors. At least two ( 2) feet of pull wire shall be doubled back into the conduit at each termination. All conduit runs shall be free of dirt, debris and excessive moisture before cable is pulled. Existing underground conduit to be incorporated into the new system shall be cleaned with a mandrel or cylindrical wire brush and blown out with compressed air. Conduit shall be laid to a depth of not less than eighteen ( 18) inches below finished grade in all areas, except that conduit may be laid on top of and secured to the existing pavement within new curbed medians being constructed on top of the pavement. Rigid metal conduit shall be placed under existing pavement by approved jacking or drilling methods. Pavement shall not be disturb ed without permission from the Engineer. In the event obstructions are encountered, upon approval of the Engineer, small test holes may be cut in the pavement to locate obstructions. Jacking or drilling pits shall be kept two ( 2) feet clear of the edge o f any type of pavement wherever possible. Water jetting will not be permitted. Conduit terminating in pile or pedestal bases shall extend four ( 4) inches vertically above the foundation and shall be sloped towards the hand -hole opening. At all conduit t ermini, the conduit shall enter the outlet from the direction of the run. Conduit size shall be the same for terminal point to terminal point. No reducing couplings will be permitted. If it is determined by the Engineer that it is impractical to bore th e conduit under concrete or asphaltic pavement due to unforeseeable obstructions, the Contractor may, with the Engineer's permission, cut the existing pavement. The pavement shall be cut along neat and true lines by means of a concrete saw. The depth of the trench shall be as specified and the width shall be the minimum required for proper excavation and backfilling. The trenching operation, along with
Source: West Virginia Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 657–658 of 1,006.