952.2(c) 952.2(d) the temperature is 5F below the set temperature. The activation temperature must be set by the cabinet manufacturer according to their recommendations. A temperature sensor must provide an alarm for cabinet overheating. Activate the alarm at 150F. If the controller cabinet is connected to an RTMC or central system, the temperature alarm must place a notification to the RTMC or central system.
1.a Light Duty Relay. Mounted in a clear, plastic cover, permanently marked to indicate coil voltage rating, and as follows:
• Usage . Logic, Preemption or Interconnection.
• Voltage . 115 V (ac) or 24 V (dc).
• Switch Type . TPDT or DPDT.
• Contact Rating . 2 A.
• Contact Material . Fine Silver or Silver Alloy.
1.b Heavy Duty Relay. Mounted in a clear, plastic cover, permanently marked to indicate coil voltage rating, and as follows:
• Usage . Continuous Duty -Transfer of signal indications from normal operation to flashing and the reverse.
• Voltage . 95V to 135 V (ac), 57 Hz to 63 Hz.
• Switch Type . DPDT.
• Contact Reading . 20 A.
• Contact Material . Fine Silver or Silver Alloy.
• Standard Socket . 8 Pin, Jones Type.
load center, police panel switches, signal load switches, signal cable terminals, controller unit, conflict monitor, detectors, and relays, and as follows:
• Wiring . Arrange and lace or enclose in a raceway or in plastic tubing.
• Terminal Blocks . Barrier -type, with marker strips and nickel -plated brass screws, 8 -5/16-inch minimum for detector leads, 10 -5/16-inch minimum for signal leads, rated for 20 A at 1000 V (rms).
3.a Breakers and Receptacles.
• Circuit Breakers . 15 A minimum, flashing circuit and duplex receptacle. 15 A minimum, traffic control equipment.
buttons. 15 A minimum.
3.b Radio Frequency Interference (RFI). UL-Listed, RFI filter, according to NEMA standard testing procedures, TS -2 chapter 5, and as follows:
• Line Voltage . 95 V to 135 V (ac).
• Line Frequency . 200kHz to 75MHz with minimum attenuation of 50dB.
• Line Current . 125% of the total connected load, 30 A minimum.
• Operating Temperature . -29F to 165F.
• Insulation Resistance . 6,000 megaohms.
• Line to Ground Rating . 1500 V (ac), one minute.
• Line to Line Rating . 1450 V (dc), one minute.
• Humidity Range . 5% to 95