Control Equipment Art. 1074.01 operation, that is, traffic responsive, time of day, or free, and the timing plan in effect for the coordinated operation, that is, cycle length, split, and offset. The display shall be capable of displaying indicators for all used controller phases and associated pedestrian phases, overlap phases, local detector actuation, and system detector actuation.
d.System Diagnostics.
1.Local Controller Diagnostic. At a minimum the master controller shall diagnose and report local controller flash fault by reporting the conflict monitor/malfunction management unit fault logging information for the current fault.
2.System Detector Diagnostic. Each system detector shall be monitored for constant calls, absence of calls, or erratic output. Diagnostic values shall be user programmable for all detectors on a system basis. System detectors which fail the diagnostic test shall be automatically deleted for volume and occupancy calculations. The event of failure occurrence shall be stored for reporting. Upon resumption of satisfactory operation, detectors shall automatically resume input to volume and occupancy calculations. SECTION 1074. CONTROL EQUIPMENT
1074.01 Digital Time Switch. The digital time switch shall be according to
NEMA Standards for Traffic Control Systems, TS 2, and the following.
a.Functions. The digital time switch shall be capable of opening and closing a circuit at specific times of a day and shall be capable of omitting circuit operation during certain days of the week. It shall be possible to set any opening or closing to the nearest minute. The minimum open period shall be 90 minutes and the minimum close period shall be 30 minutes. It shall also be capable of providing four "on" and four "off" operations in each 24 hour period. All settings shall be field programmable using a key pad.
b.Designs. The digital time switch shall contain a precise clock based on a seven day program, settable to the nearest second of the week, day, hour, and minute. The clock shall automatically adjust for daylight savings and leap years. The digital time switch shall have a battery back-up feature to protect against loss of timing in case of a power failure. During power failure, the battery operation shall keep the unit in time for a period of up to 100 hours. The unit clock accuracy shall be 0.005 percent or better when it is on battery power and shall assume normal operation upon resumption of power. Art. 1074.02 Control Equipment
c.Special Features. The digital time switch shall include the following light emitting diodes indicators to confirm the applicable status outputs.
1.ON - OFF.
2.LINE POWER - BATTERY. A time of day display shall be provided which is easily readable outdoors. Each unit furnished shall be labeled as to the function it controls.
1074.02 Pedestrian Push-Button. Pedestrian push-button assemblies shall
be ADA compliant, vandal and weather resistant, be pressure activated with minimal movement, and cannot be stuck in a closed or constant call position. A red latching LED and audible tone shall be provided for confirmation of an actuation call.
a.Housing. The pedestrian push-button housing shall be constructed of aluminum alloy according to ASTM B 308 6061-T6 and furnished with suitable mounting hardware.
b.Latching LED. The normal state of the LED shall be off. When the push button is pressure activated, the LED shall be lighted and remain on until the beginning of the walk phase. The latching relay shall be mounted in the signal cabinet, controlling two pedestrian phases.
c.Actuator. The actuator shall be at least 2 in. (50 mm) in diameter and be stainless steel with a solid state electronic Piezo switch rated for a minimum of 20 million cycles with no moving plunger or moving electrical contacts. The operating voltage shall be 12-24 V AC/DC. The actuator’s nominal operating force shall be approximately 1 lb (4.45 N).
d.Sign. The sign shall be according to the plans and shall meet the requirements of Section 720.
1074.03 Controller Cabinet and Peripheral Equipment.
a.Cabinet. A controller cabinet shall house a controller and peripheral equipment by providing a secure space and by guarding against inclement weather. The cabinet shall be made of an aluminum alloy and shall be of sturdy construction. Only one cabinet shall be permitted at one intersection for all traffic control equipment.
1.Cabinet Type. The cabinet specified on the plans shall be determined on the basis of the average volume of the control equipment to be installed in the cabinet. The various types of cabinets shall meet the following. Control Equipment Art. 1074.03 Type Approx. Volume cu ft (cu m) Police Door Mounting Ventilation Remark I Reserved II 5.0 (0.14) Yes Post Top Filtered Air Intake and One Thermo- Statically Controlled Fan III 11.5 (0.33) Yes Ground Mount Filtered Air Intake and One Thermo- Statically Controlled Fan For Traffic Actuated Controller IV 29.0 (0.82) Yes Ground Mount Filtered Air Intake and Two Thermo- Statically Controlled Fans For Traffic Actuated Controller. Back Panel with Minimum 12 Load Switch Positions. V 44.0 (1.25) Yes Ground Mount Filtered Air Intake and Two Thermo- Statically Controlled Fans For Traffic Actuated Controller. Back Panel with Minimum 12 Load Switch Positions.
2.Weather Resistant Requirements.
a.Heavy-duty Door Gasket. Heavy-duty gaskets shall be provided around door openings to make a weather-tight seal for the protection of the enclosed equipment.
b.Caulking of Cabinets. Ground mount cabinets shall be caulked along the entire perimeter of the base with a waterproof, nonhardening exterior compound prior to setting on the foundation to ensure a water, dust and insect proof seal.
c.Screened Vent. A standard furnace filter shall be mounted on the inside of the cabinet door and shall be designed to prevent the entrance of insects, blowing rain and snow. It shall be securely attached to the cabinet and shall be removable by simple tools to permit cleaning and replacement.
d.Cabinet Exterior. The cabinet surface shall be smooth, free of marks and scratches and provide an unpainted aluminum finish.
3.Cabinet Design.
a.Multiple Door-Stop. The cabinet front door shall be capable of being held at various angles by a stop-and-catch mechanism. Art. 1074.03 Control Equipment
b.Door Handle. The door handle shall rotate outward from the locked position. The operation of the handle shall not interfere with the key, police door or any other cabinet mechanism.
c.Door Locks and Keys. The front door shall be equipped with a standard or a tumbler lock and the police door shall be provided with a police type lock. The front door lock shall not open by a standard police key. Additionally, two sets of keys shall be provided with each cabinet.
4.Transient Voltage Surge Suppression. The cabinet shall be provided with transient voltage surge suppression. Transient surge suppression unit leads shall be kept as short as possible and ground shall be made directly to the cabinet wall or ground plate as near as possible to the object being grounded. All transient surge suppression units shall be tested and certified as meeting this specification by an independent testing laboratory. One copy each of the full testing report shall be submitted to the Engineer.
a.Surge Suppressor. The suppressor protecting the solid state controller, conflict monitor/malfunction management unit, and detection equipment shall consist of two stages: stage one which shall include a controller cabinet AC power protection assembly and stage two which shall include AC circuit protection. The design of the stage one suppressor shall be modular and it shall be installed in such a way that it may be removed and replaced with the intersection under power and in flashing operation. It shall have a permanently mounted and wired base and a removable circuit package. The stage one suppressor shall have two LED failure indicators for power ‘on’ and suppression ‘failure’ and shall be according to the following. Stage One Suppressor Properties Criteria “Plug-in” suppression module 12 pin connector assembly Clamp voltage 250 V at 20,000 A typical Response time Less than 5 nanoseconds Maximum continuous service current 15 A at 120 VAC 60 Hz High frequency noise attenuation At least 50 dB at 100,000 Hz Operating temperature -40 to 185 F (-40 to 85 C) If the controller assembly includes a system telemetry module or remote intersection monitor, the status of the stage one suppressor shall be continuously and remotely monitored by an appropriate alarm circuit. The stage two, high speed, solid state, transient suppressor shall protect the system from transient over voltage without affecting Control Equipment Art. 1074.03 power at the load. It shall suppress transients of either polarity and from either direction (source or load). The suppressor shall have a visual “on” indicator lamp when the unit is operating normally. It shall also have a UL plastic enclosure, a four position terminal strip for power connection, and it shall utilize silicon avalanche diode technology. The stage two suppressor shall be according to the following. Stage Two Suppressor Properties Criteria Nominal service voltage 120 V at 50/60 Hz Maximum voltage protection level 330 V Minimum voltage protection level 220 V 5 % Minimum surge current rating 700 A Stand by power Less than 0.5 Watts Hot to neutral leakage current at 120 V RMS Less than 5 A Maximum response time 5 nanoseconds Operating and Storage temperature -4 to 122 F (-20 to 50 C)
b.Detector Loop. The shield and the drain wire of the lead-in cable shall be grounded at the controller cabinet end to the closest cabinet wall or ground plate. At the other end, the shield and the drain wire shall be insulated to prevent possible grounding.
c.Interconnection, 120 VAC. A replaceable spark gap gas type cartridge shall be provided between each incoming conductor and ground.
d.Interconnection, DC or Low Voltage Balanced Line. The unit shall be capable of withstanding a minimum of 100 repeated 2,000 A (8 x 20 microsecond wave form) surges. The response time shall not exceed 100 nanoseconds with a duty cycle of 0.01 percent for 100 A surge. The voltage clamp shall be 30 V.
5.Miscellaneous Cabinet Function Requirements.
a.Signal Flash in Absence of Conflict Monitor/Malfunction Management Unit. The cabinet shall contain circuitry that will place signal into flashing mode of operation if the conflict monitor/malfunction management unit is disconnected.
b.Thermostatically Controlled Exhaust Fan. The cabinet shall be equipped with a thermostatically controlled exhaust fan. The fan shall have a minimum air delivery capacity of 100 cfm (2.8 cu m/min) and shall be mounted on self-lubricating ball bearings. The thermostat control shall be adjustable between 91 and 113 °F (33 and 45 °C) and shall be set to turn the fan on at 95 °F (35 °C). Art. 1074.03 Control Equipment
c.Power Outlet and Light Fixture. Within the cabinet shall be provided a grounded three wire, 120 V, ground fault interrupter duplex outlet and a cabinet-door-switchable E26 base light fixture with a light bulb of 800 lumens minimum.
d.Signal Control Switches. The switches shall be provided in the controller cabinet for the following mode of operation. Controller: ON-OFF Controller: STOP TIME-RUN-REMOTE Signals: NORMAL-MUTCD FLASH (with controller on) The switches shall be provided in the police door compartment for the following mode of operation. Signals: ON-OFF (The switch operation shall not depend on the position of AUTO-FLASH switch.) Signals: AUTO-FLASH (with controller in stop time) Signals: AUTO-MANUAL
e.Railroad Interconnection. Railroad interconnected controllers and cabinets shall be fully tested and approved in the equipment suppliers facility prior to field installation. Three copies of the complete cabinet wiring showing all connections including railroad interconnect circuit shall be furnished. Cabinets shall be equipped with a labeled test switch for the railroad interconnected pre-emption line which shall place a call in the controllers railroad pre-emption routine and also shall acknowledge power to the interconnect line. The switch shall resume to normal position upon release. The terminal facility shall be wired so as to provide supervision of all essential pre-emption components. This wiring shall cause the facility to transfer to or remain in flashing operation in the event any critical component is missing, not connected or failed. The preemption interface relay shall be wired so as to be in the energized state during normal (non-pre-empt) operation. Each critical element such as controller harnesses and interface relays shall be wired to form a series loop which must be complete for normal operation. A method of supervising the individually shielded three pair cable or individually braided three conductor cable, interconnecting the traffic and railroad facilities shall provide flashing red operation during failed cable conditions. Upon detection of a failed railroad interconnect the controller shall provide one track clearance green interval and shall enter flashing red operation at the end of track clearance red interval. Such flashing operation shall be manually reset. The supervision circuit shall be capable of detecting failure Control Equipment Art. 1074.03 of the supervision circuit components themselves, and shall provide fail-safe operation upon such failure. A Department approved method of controller security shall be implemented to ensure data integrity and to preclude changes to critical data. The method shall include a means for the controller to continuously verify controller/cabinet Cyclical Redundancy Check (CRC) or Terminal and Facility (T&F) Signature match. The CRC or T&F Signature shall be developed based on preemptor entries, unit data (including phases in use, sequence and ring structure, etc.), overlap assignment and timing, firmware version, and any special memory content necessary to proper operation. Controllers shall invert the remote flash input or the flashing logic output to preclude installation of a controller not intended for railroad preemption use. The controller’s normal railroad preemption input shall utilize a secondary interlock input that is normally active or on when no demand for railroad preemption is present. When a demand for railroad preemption is received, the normal railroad preemption input shall activate and the secondary input shall drop. If both inputs are simultaneously on or simultaneously off for a duration of one second, the controller shall recognize this as an input failure. Upon a failure, the traffic controller shall provide one track clearance green interval and shall enter flashing red operation at the end of the track clearance red interval. Such flashing operation shall be manually reset.
b.Peripheral Equipment.
1.Malfunction Management Unit. A malfunction management unit shall be according to NEMA Standards for Traffic Control Systems, TS 2, including the specified monitoring of signal indication conflict, absence of RED signal voltage, and voltage. The malfunction management unit shall be according to the following.
a.Number of Programmable Channels. The malfunction management unit shall have either 12 or 18 fully programmable channels according to NEMA Type 12 or Type 18 unit respectively. The number of channels shall be sufficient to monitor all of the used vehicular phases, associated pedestrian phases, and overlap phases.
b.Simultaneous Dual Color Conflict. The malfunction management unit shall detect simultaneous display of two separate colors in each signal face, except the simultaneous display of "circular red" and "green turn arrow", or "circular red" and "yellow turn arrow" as signal indication conflict. Art. 1074.03 Control Equipment
c.Operation Upon Conflict Detection. Upon detection of signal indication conflict, absence of RED signal voltage or specified voltage deviation, the monitor shall place the signals into emergency flashing operation. The controller shall stop timing in the condition that existed at the moment of conflict and shall remain in stop time, except for the emergency flash caused by specified voltage deviation, until reset by maintenance personnel. The monitor channel indicators shall display the fault status and the field output status at the time of the failure.
d.Fault Log. The malfunction management unit shall store a minimum of last 20 fault status and the corresponding field output status with the date and time stamps in a non-volatile memory.
e.Channel to Phase Association. The malfunction management unit channels shall be assigned the same channel numbers as the phase they are monitoring.
2.Load Switches. All signal lamp circuits shall be opened and closed by solid state load switches according to NEMA Standards for Traffic Control Systems, TS 2. Load switches shall have a rated load capacity of 15 A minimum within the temperature range of -29 and 165 °F (-34 and 74 °C). A sufficient number of load switches shall be furnished with each controller so the maximum load per circuit will not exceed 900 W. The load switches shall be provided with LED indicator lights to indicate the controller output status.
3.Panel and Terminal Facilities. Panel and terminal facilities shall be according to NEMA Standards for Traffic Control Systems, TS 2, except the power to the signal bus shall be provided through a solid state relay(s). Additionally, the panel and terminal facilities shall be according to the following. The panel board shall be provided on the back wall of the controller cabinet containing local switch sockets and terminal facilities. The load switch sockets shall be positioned so as to accept various NEMA load switches with different sizes of heat sink housings. The back panel for the cabinet Types IV and V shall contain at a minimum: 12 load switch wired sockets and four flash transfer relay wired sockets. To prevent the malfunction management unit from detecting absence of RED voltage on the spare wired sockets, the RED output pin (pin 1) shall be wire jumpered to 120 VAC (pin 3). One circuit breaker rated 10 A shall be provided for the control equipment and another circuit breaker rated 40 A shall be provided for the signal load. The field wire terminals shall be located at least 10 in. (250 mm) above the bottom of the controller cabinet. Control Equipment Art. 1074.04
4.Flasher Unit and Flasher Relay. A flasher unit shall be according to NEMA Standards for Traffic Control Systems TS 2, for NEMA Type 3 Flashers, (15 A, dual circuit) and the following. Each controller shall be provided with one or more jack mounted flasher units and the necessary relays. The flasher and flasher relay shall not operate at more than 85 percent of its rated load. In conflict monitor triggered flash, all three color signal indications shall flash in red, all signals controlling the same approach of an intersection shall flash simultaneously, and the pedestrian signal faces shall be dark. Automatic changes from stop-and-go to flashing operation and vice versa shall begin at a predetermined interval according to the MUTCD. It shall be possible to remove the controller and its associated components from the cabinet with the flasher continuing in operation.
1074.04 Uninterruptable Power Supply (UPS).
a.Operation.
1.The UPS shall be line interactive and provide voltage regulation and power conditioning when utilizing utility power. The UPS shall be sized appropriately for the intersection load. The total system load shall not exceed the manufacturer’s specifications. A standard UPS shall provide a minimum of two hours full run-time operation for LED signal modules load at 77 °F (25 °C) (minimum 700 W/1000 VA active output capacity, with 80 percent minimum inverter efficiency). An extended UPS shall provide a minimum of six hours full run-time operation for the same conditions.
2.The maximum transfer time from loss of utility power to switchover to battery backed inverter power shall be 65 milliseconds.
3.The UPS shall have four sets of normally open (NO) and normally closed (NC) single-pole double-throw (SPDT) relay contact closures, available on a panel-mounted terminal block, rated at a minimum 120 V/1 A, and labeled so as to identify each contact according to the plans.
a.The first set of NO and NC contact closures shall be energized whenever the unit switches to battery power. Contact shall be labeled or marked “On Batt”.
b.The second set of NO and NC contact closures shall be energized whenever the battery approaches approximately 40 percent of remaining useful capacity. Contact shall be labeled or marked “Low Batt”. Art. 1074.04 Control Equipment
c.The third set of NO and NC contact closures shall be energized two hours after the unit switches to battery power. Contact shall be labeled or marked “Timer”.
d.The fourth set of NO and NC contact closures shall be energized in the event of inverter/charger failure. Contact shall be labeled or marked “UPS Fail”.
4.Operating temperature for the inverter/charger, power transfer relay, and manual bypass switch shall be -35 to 165 °F (-37 to +74 °C).
5.Both the power transfer relay and manual bypass switch shall be rated at 240 VAC/30 amps, minimum.
6.The UPS shall use a temperature-compensated battery charging system. The charging system shall compensate over a range of 1.4 – 2.2 mV/°F (2.5 - 4.0 mV/°C) per cell. The temperature sensor shall be external to the inverter/charger unit. The temperature sensor shall come with 6.5 ft (2 m) of wire.
7.Batteries shall not be recharged when battery temperature exceeds 122 °F ± 5 °F (50 °C ± 3 °C).
8.The UPS shall bypass the utility line power whenever the utility line voltage is outside of the following voltage range: 100 VAC to 130 VAC (± 2 VAC).
9.When utilizing battery power, the UPS output voltage shall be between 110 and 125 VAC, pure sine wave output, ≤ 3 percent THD, 60 Hz ± 3 Hz.
10.The UPS shall be compatible with the Department’s traffic controller assemblies utilizing NEMA TS 1 or NEMA TS 2 controllers and cabinet components for full time operation.
11.When the utility line power has been restored at above 105 VAC ± 2 VAC for more than 30 seconds, the UPS shall dropout of battery backup mode and return to utility line mode.
12.When the utility line power has been restored at below 125 VAC ± 2 VAC for more than 30 seconds, the UPS shall dropout of battery backup mode and return to utility line mode.
13.The UPS shall be equipped to prevent a malfunction feedback to the cabinet or from feeding back to the utility service.
14.In the event of inverter/charger failure, the power transfer relay shall revert to the NC state, where utility line power is reconnected to the cabinet. In the event of an UPS fault condition, the UPS shall always revert back to utility line power. Control Equipment Art. 1074.04
15.Recharge time for the battery, from “protective low-cutoff” to 80 percent or more of full battery charge capacity, shall not exceed twenty hours.
16.The manual bypass switch shall be wired to provide power to the UPS when the switch is set to manual bypass.
17.When the intersection is in battery backup mode, the UPS shall bypass all internal cabinet lights, ventilation fans, and service receptacles.
18.As the battery reserve capacity reaches 50 percent, the intersection shall automatically be placed in all-red flash. The UPS shall allow the controller to automatically resume normal operation after the power has been restored. The UPS shall log an alarm in the controller for each time it is activated.
19.A blue LED indicator light shall be mounted on the front of the traffic signal cabinet or on the side of the UPS cabinet facing traffic and shall turn on to indicate when the cabinet power has been disrupted and the UPS is in operation. The light shall be a minimum 1 in. (25 mm) diameter, be viewable from the driving lanes, and able to be seen from 200 ft (60 m) away.
20.All 24 volt and 48 volt systems shall include an external component that monitors battery charging to ensure that every battery in the string is fully charged. The device shall compensate for the effects of adding a new battery to an existing battery system by ensuring that the charge voltage is spread equally across all batteries.
b.Mounting/Configuration.
1.General.
a.The inverter/charger unit shall be rack or shelf-mounted.
b.All interconnect wiring provided between the power transfer relay, manual bypass switch, and cabinet terminal service block shall be at least 6.5 ft (2 m) of #10 AWG wire.
c.Relay contact wiring provided for each set of NO/NC relay contact closure terminals shall be 6.5 ft (2 m) of #18 AWG wire.
d.To ensure interchangeability between all UPS manufacturers, the UPS power transfer relay and manual bypass switch shall be interconnected with Type IV or Type V NEMA cabinets as shown on the plans.
2.Battery Cabinet.
a.The inverter/charger and power transfer relay shall be installed inside the external battery cabinet and the manually bypass switch shall be installed inside the traffic signal cabinet. Art. 1074.04 Control Equipment
b.Batteries shall be housed in a separate NEMA Standard TS 2 rated Type II cabinet. This external battery cabinet shall be according to
Article 1074 — 03 for the construction and finish of the cabinet.
c.No more than two batteries shall be mounted on individual shelves for a cabinet housing four batteries and no more than four batteries per shelf for a cabinet housing eight batteries.
d.A minimum of three shelves shall be provided. Each shelf shall support a load of 132 lb (60 kg) minimum for dual batteries.
e.The battery cabinets housing four batteries shall have nominal outside dimensions according to a NEMA Type II cabinet; or alternatively, a width of 14 in. (355 mm), a depth of 9 in. (230 mm), and a height of 45 to 55 in. (1.14 to 1.4 m). The battery cabinets housing eight batteries shall have nominal outside dimensions according to a NEMA Type III cabinet; or alternatively, a width of 28 in. (710 mm), a depth of 9 in. (230 mm), and a height of 45 to 55 in. (1.14 to 1.4 m). Clearance between shelves shall be a minimum of 10 in. (250 mm).
f.The battery cabinet shall be ventilated through the use of louvered vents, filters, and one thermostatically controlled fan as per NEMA TS 2 specifications. The cabinet fan shall not be energized when the traffic signals are on UPS power.
g.The battery cabinet shall have a door opening to the entire cabinet. The door shall be attached to the cabinet through the use of a continuous stainless steel or aluminum piano hinge. The cabinet shall be provided with a main door lock which shall operate with a traffic industry conventional No. 2 key. Provisions for padlocking the door shall be provided.
h.The UPS with battery cabinet shall come with all bolts, conduits and bushings, gaskets, shelves, and hardware needed for mounting.
i.A warning sticker shall be placed on the outside of the cabinet indicating that there is an uninterruptable power supply inside the cabinet.
c.Maintenance, Displays, Controls, and Diagnostics.
1.The UPS shall include a display and/or meter to indicate current battery charge status and conditions.
2.The UPS shall have lightning surge protection compliant with IEEE/ANSI C.62.41.
3.The UPS shall be equipped with an integral system to prevent destructive discharge and overcharge. Control Equipment Art. 1074.04
4.The UPS hardware and batteries shall be easily replaced without requiring any special tools or devices.
5.The UPS shall include a resettable front-panel event counter display to indicate the number of times the UPS was activated and a front-panel hour meter to display the total number of hours the unit has operated on battery power.
6.The UPS shall be equipped with an RS-232 port. USB or alternate connectors may be substituted with approval of the Engineer.
7.The manufacturer shall include two sets of equipment lists, operation and maintenance manuals, board-level schematic and wiring diagrams of the UPS, and battery data sheets. The manufacturer shall include any software needed to monitor, diagnose, and operate the UPS. The manufacturer shall include any required cables to connect the UPS to a laptop computer.
d.Battery System.
1.Individual batteries shall be 12 V type, 65 amp-hour minimum capacity at 20 hours, and shall be easily replaced and commercially available off the shelf.
2.Batteries used for the UPS shall consist of four to eight batteries with a cumulative minimum rated capacity of 240 amp-hours.
3.Batteries shall be gel cell, deep cycle, completely sealed, prismatic lead-calcium based, silver alloy, valve regulated lead acid (VRLA) requiring no maintenance.
4.Batteries shall be certified by the manufacturer to operate over a temperature range of -13 to 160 °F (-25 to + 71 °C).
5.The batteries shall be provided with appropriate interconnect wiring and corrosion-resistant mounting trays and/or brackets appropriate for the cabinet into which they will be installed.
6.Batteries shall indicate maximum recharge data and recharging cycles.
7.Battery interconnect wiring shall be via a modular harness. Batteries shall be shipped with positive and negative terminals pre-wired with red and black cabling that terminates into a typical power-pole style connector. The harness shall be equipped with mating power-pole style connectors for the batteries and a single, insulated plug-in style connection to the inverter/charger unit. The harness shall allow batteries to be quickly and easily connected in any order and shall be keyed and wired to ensure proper polarity and circuit configuration.
8.Battery terminals shall be covered and insulated so as to prevent accidental shorting. Art. 1076.01 Wire and Cable SECTION 1075. RESERVED SECTION 1076. WIRE AND CABLE
1076.01 Multi-Conductor Power Cable.
a.General. The cable shall be an assembly of insulated power conductors, plus an insulated ground wire cabled according to UL 854 with fillers and binder tape, and with a jacket overall. The cable shall be rated 194 °F (90 °C) dry and 167 °F (75 °C) wet. All conductors in the assembly may be either coated, (thinned), or uncoated copper, except all conductors of a given cable type for the project shall be of the same type and be according to Article 1066.02.
b.Ground Conductor. The insulated ground conductor shall correspond to the insulated conductor size as indicated in the following table. Insulated Conductor Size, AWG Insulated Ground Conductor Size (AWG) Min. 6 8 4 8 2 thru 2/0 6 3/0 thru 4/0 4
c.Insulation. Each conductor shall be insulated with XLP insulation according to Article 1066.03. Conductor insulation shall be color coded. Neutral conductors shall be color coded white. Three conductor cables (plus ground) for use on single phase systems shall be color coded one black, one red, and one white. Two conductor (plus ground) cables for use on single phase systems shall be color coded one black and one white when used on phase-to-neutral systems, and one black and one red when used on phase-to-phase systems. Three conductor cables for use on three phase systems shall be color coded one black, one red, and one blue. Ground conductors shall be color coded green. Color coding for other cable configurations and systems shall be as directed by the Engineer. Color coding shall be made by means of impregnating the insulation with the color. The coloring process shall impregnate a color which is fade resistant. Color coding via striping, lettering, painting, or other means will not be acceptable for these systems. Each conductor shall be marked by printing in a contrasting color the size, voltage rating, type of insulation, and required UL information.
d.Overall Jacket. The cable assembly shall have chlorinated polyethylene (CPE) jacket applied over the assembly. The jacket shall meet the
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 1024–1037 of 1,217. View official source ↗