956.1 956.2(b)
956.1DESCRIPTION —This work is the furnishing and installation of devices to sense the presence or
passage of vehicles or pedestrians.
956.2MATERIAL —
• Traffic Signals -General . Section 950.2.
• Certification. Section 106.03(b)3.
• Luminaire Arms . Section 910.2.
sensor and as follows:
• Number of Components . One or two.
• Application Temperature. 32F to 100F, unless otherwise specified by manufacturer .
• Tack Free . 1-hour maximum .
• Maximum Curing Time. 30 hours .
• Permanent Flexibility . To -20F.
• Chemically Resistant To: De-Icing Chemicals, Gasoline, Calcium Chloride (5%), Motor Oils, and Hydraulic Brake Fluid.
3.a. Power Supply. Furnish a switching- type power supply and as follows:
• Input Voltage. 95 V to 135 V (ac), 57 Hz to 63 Hz .
• Output Voltage. 24 V ± 0.3 V (dc) .
• Minimum Output Voltage. 22.8 V (dc).
• Efficiency . 70% minimum .
• Full Load Current . 3 A minimum.
• Line Regulation. 0.1% over entire input range.
• Load Regulation. 0.2% from no load to full load.
• Ripple Noise . 40 mV (p -p) typical, 75 mV (p- p) at full load. 956.2(b) 956.2(c) • Environmental . NEMA TS 1, Part 2.
Provide a front panel incorporating a pilot lamp, test points for monitoring output voltage, and a circuit breaker or fuse. Ground all exterior metal surfaces to the chassis safety ground.
3.b. Card Rack. A standard EIA, 19 -inch rack for mounting the detector amplifier units, as follows:
• Aluminum front rails drilled and tapped (10- 32), with EIA spacing.
• Aluminum chassis supporting angles, 10 inches deep and 3 -inches wide, for mounting on the sides of the controller cabinet.
• Aluminum connector panels, with connector mounting holes, tapped (4-40) on 0.200 -inch centers, then mounted to form a cage 19 inches wide, 5 1/4 - inches high, and 6 1/2 -inches deep.
• Nonmetallic guides and Cinch- Jones No. 50- 44A-30M rear connectors, mounted at 1.200 inch spacings.
compound. Provide an appropriate size to accommodate in- line, wye, “x,” butt, and dead -end splicing of cables rated at 1000 V or less, with outside diameters from 0.25 inch through 2.50 inches. Supply with the following components:
• Two-part transparent mold body of PVC construction, with tongue- and-groove seams and built -in spacer web.
• Two