(A) All wire and cable installed under this section from the power source to the lighting standards shall be contained in either conduit manufactured as U.L. listed plus 40 heavy wall EPC, rigid non-metallic conduit or heavy-walled galvanized steel conduit. Direct burial of all wire and cable under this section is prohibited.
(1) All cable, conductor and duct shall be new, having been manufactured within 12 months of the date of installation. The size, type of insulation, voltage and manufacturer's name shall be permanently marked on the outer covering at regular intervals. It shall be delivered in complete coils or reels with identifying U.L. tags and labels attached and shall be in first-class condition when installed.
(2) Materials shall be packaged by the manufacturer and delivered with identifying U.L. tags and labels attached. All U.L. labels and tags shall be permanently removed from the reels and cartons by the village representative for his records.
(3) Cables and conductors will be subject to inspection for acceptance as to quality, conditions, and installation during final inspection. The conduit material shall be subject to inspection for acceptance as to installation during construction.
(4) All underground conductors shall be a minimum No. 6 or No. 8 A.W.G. XLP-RHH copper, soft and annealed and shall conform to ASTM Specification for stranded conductors. The conductor sizes used for the supply voltage runs are determined by the maximum voltage drops allowed in the circuits. All pole wiring shall be solid No. 10 A.W.G. XLP-RHH. Copper conductor insulation shall be heat and moisture resistant plastic suitable for use at 90° Celsius in wet locations at 600 volts. The wiring system shall be a parallel system with a minimum of three insulated conductors: black, red and neutral colored white. The maximum voltage drop between the controller or fuse box and the furthest light pole of the system shall not exceed 2%. Calculations must be provided by the contractor or the developer's engineer.
(5) Cable conduit shall be a minimum of two inches in diameter.
(6) All wire and cable installed under this section shall be heat and moisture resistant, Type XLP-RHH, and be suitable for use at 90° Celsius and shall have insulation rated at 600V.
(7) The bare ground wire shall be #8 AWG stranded copper wire.
(B) All wire shall be subject to an insulation test to ground after installation. The minimum acceptable resistance to ground shall be 250,000 ohms. Any section of wiring failing to pass the minimum insulation test for any reason or showing an obvious short circuit shall be rejected. All wire, cable and unit duct to be furnished shall be buried not less than 24 inches below finished grade.
(C) All runs shall be continuous without splice in cable from pole handhole or to control cabinet.
(D) Adequate slack shall be provided such that the service connection can be made without splices other than at the power source. In the case of aerial service, an insulating bushing shall be provided for the steel conduit service pole riser.
(E) When passing under concrete or asphalt surfaces, rigid galvanized steel conduit not less than two inches in diameter with bushing shall be provided for raceways.
(F) A splice connection in handholes only for copper conductors shall be made with spiral spring wire, lug type, or approved equal connectors. Splices in handholes below grade level shall be Scotchcast kits or equivalent equal.
(G) Rigid galvanized metal conduit shall be two inches in diameter minimum and comply with Underwriter's Laboratories, Inc. Standard U.L. 6, WW-C-581a and ASA Specification C80-1. Each length of conduit shall bear an Underwriter's Laboratories label. Conduit may be either pushed or trenched depending on location. Rigid galvanized metal conduit shall be required for:
(1) Street light foundation raceways.
(2) Control cabinet foundation raceways.
(3) All pavement crossings. Conduit shall also extend two feet beyond the curb and shall be pushed or augured under pavement.
(4) The conduit between the street light control cabinet and the Commonwealth Edison connection shall be three inch rigid steel.
(H) (1) Concrete handholes shall be constructed at all street intersections and wherever there is change in alignment of the cable greater than 20 degrees. No handhole will be required where the cable is installed with a radius of 20 feet or greater. Heavy duty handholes shall be required in areas subject to motor vehicle traffic.
(2) Street lighting handholes shall be air entrained Class SI Portland cement concrete with a maximum three inch slump and a minimum 14 day compressive strength of 3500 psi using an IDOT approved mix for this class of concrete, when possible. All conduit shall extend into the handhole a minimum of four inches with a minimum of six feet of cable pulled into the handhole for splices per conductor run. All handholes shall contain a frame and lid with the designation "STREET LIGHTING" cast therein.
(I) All installation of the cable and conduit between poles shall be placed in trenches a minimum of six inches wide and 24 inches below design subgrade elevation.
(1) There shall be no sharp bends where the conduit enters the trench, compacted approved fill shall be built up to half-fill the opening in the conduit so that emerging cable conduit will have a smooth bed at this critical point. If the trench depth is less than 12 inches because of obstructions, the contractor shall cut a groove in such obstruction so the trench is a minimum of 12 inches deep. The cable conduit shall be laid in this groove, anchored to prevent floating and covered to grade. Where trench depth exceeds 12 inches but is less than 24 inches deep, any material excavated from the trench, which in the opinion of the Village Engineer is satisfactory backfilling material, may be used. Cinders, frozen earth, or other deleterious materials will not be permitted in the backfill. Stone used in backfill shall be less than two inches in any dimension.
(2) Backfilling shall be completed as soon as possible after inspection. Backfill shall be deposited in uniform layers not to exceed six inches thick loose measure. The material in each layer shall be mechanical compacted in a manner approved by the Village Engineer.
(3) The village reserves the right to make inspections of the trench construction and at any other stage it designates.
(J) Wiring test.
(1) The tests outlined in this section are field tests to be performed in the presence of the Village Engineer's representative. They shall be performed by the contractor's personnel and their equipment. Defects shall be corrected and testing repeated until all sections of the installation are sound. Splicing or repairing of insulation below grade is not permissible except in a handhole.
(2) All construction shall be completed before tests are made. The poles shall be erected, with ballasts and lamps in place. Trenches shall be backfilled and all connections shall be made.
(3) Insulation resistance shall be measured with a megger generating not less than 500 or more than 1,000 volts. A multimeter is not acceptable because it applies only a few volts which will permit some insulation defects to go undetected. Erratic behavior of the megger during the test indicates an intermittent weakness which must be corrected. Only the lower value indicated shall be considered or recorded.
(4) The Village Engineer's representative shall log the serial number and voltage rating of the megger used by the contractor. He shall then confirm the calibration of the megger by connecting the two leads of the megger together so that the resistance to be measured by the megger when it is turned at full speed is zero. Unless this is true, the megger will give false reading under all other circumstances as well.
(5) Each circuit shall be permanently tagged for identification and then tested at the control centers. The full voltage of the megger shall be applied between ground and each insulated wire in each circuit. The ground shall consist of a driven, copper-clad rod 8' x 5/8" or larger connected by #8 wire to the ground terminal in the control cabinet. Circuits shall be isolated from each other by opening the circuit breakers.
(6) The minimum, acceptable resistance to ground shown by the megger shall be 250,000 ohms. The tests shall be conducted as follows:
(a) Test at each pole location from handhole to the last light in a string of lights. Locate any faults in underground cable before connecting lamps.
(b) Test each lamp assembly at handhole using the #10 downwire in each of the lamp poles. Correct any faults.
(c) Test the complete system with all connections made except the fuses will not be installed in the switch box. Test the system from fuse output lug to ground at the switch box.
(d) If a service center, check each circuit at the breaker output in the control center.
(e) All tests shall be conducted in the presence of a representative of the village or the Village Engineer.
(7) With all lamps "on" for a minimum of five minutes, measure the voltage at the fuse output lug in the safety switch box. Then using the same meter, measure the voltage to the last light in the string at the handhole connection in the base of the pole for that lamp. The percent of voltage drop from the supply fuse to the lamp shall not be more than 2%.
(8) A test log shall be used during the test noting all results and identifying all meters used. Test logs will be signed by the contractor's representative and the Village Engineer's witness.
(K) Service and control center.
(1) Service centers, if used, shall be established at such points as are found feasible for the area to be serviced. The final selection of a service and control center shall be approved by the Village Engineer and the Commonwealth Edison Co. At each service center, the service switch and circuit breaker shall be mounted in a weather-proof cabinet made of rust-resistant metal or aluminum and shall be marked "Street Lighting". This cabinet shall be equal to Crouse Hinds #27394 adapter.
(2) The cabinet shall be mounted on an 18 inch diameter concrete base 4'-0" deep cast in place consisting of four vertical rods and #3 rings 12 inches and on center for reinforcing. The top of the base shall be two and one-half inches (+1/2") above finished grade. The base shall include a two inch feeder conduit with standard radius and one and one-half inch service conduit connected directly to the meter socket as required by Commonwealth Edison Co. All feeder and supply conduit shall enter the cabinet from the bottom.
(3) The service center distribution cabinet shall be securely grounded by driving into the ground a 3/4" x 10' copperweld ground rod inside concrete base of a cabinet and connected to control panel ground terminal. On the back of the control center shall be mounted the meter socket for the mounting of the service meter. The control center cabinet shall be provided with a secure locking facility and duplicate keys must be provided for same.
(Ord. 07-57, passed 12-17-2007)