11831 AIRPORT RD WHOLE SITE FILE 2020-01-21

Dual-Element six-conductor shall be a composite of two elements. The first element shall have five 18 AWG stranded copper conductors and each shall have polyethylene insulation, color coded White, Red, Blue, Black, and Brown. Insulation thickness shall be a minimum of 16 mils. The second element shall have one 20 AWG solid copper conductor and shall have foam polyethylene insulation with a minimum thickness of 56 mils. This shall be surrounded by a 95% bare copper braid with an outer polyethylene insulation jacket with a minimum thickness of 35 mils. Both elements shall be enclosed in an outer black PVC jacket having a minimum thickness of 30 mils with ratings of 600V and 165°F. Both ratings shall be permanently ink imprinted on the outer jacket. The total diameter of the entire assembly shall be 0.50" ± 0.025". Except as noted in the following pre-approved list of this section, samples of each item shall be submitted to the Engineer for approval. Pre-approved list: Isotec part X341667-00 9-29.3(2) H Three-Conductor Shielded Cable Section 9-29.3(2)H is deleted in its entirety and replaced with the following: Three conductor shielded cable (3CS) for the detector circuit for optical fire preemption receivers shall be Model 138 Opticom cable. 9-29.3(2) I Twisted Pair Communications Cable Section 9-29.3(2)1 is supplemented with the following: Twisted-Pair(TWP) Copper Cable Testing The Contractor shall perform a Field Acceptance Test on the installed cable. Each pair shall be tested for frequency attenuation between the communication hub and each ITS device. The Contracting Agency will provide a witness during the tests and the test results shall be documented as prescribed elsewhere in this specification. Any pairs showing attenuation greater than 2 dB per mile at 1 kHz shall be cause for rejection of the cable. The Contractor shall replace any cable failing this test at no additional expense to the Contracting Agency. The Contractor shall provide all test equipment necessary to perform the tests. All pairs of each underground cable shall be tested for continuity, polarity, shorts, grounds, longitudinal balance, and both resistive and impedance losses consistent with the manufacturer's specifications and standard telecommunication industry requirements. Each TWP copper cable intended primarily for data communication applications shall be tested end-to-end from the controlled environment vault cable termination point to the interface at the traffic control device. The transmission test procedure shall include the continuity testing of each pair within each TWP cable from the outlet in the termination panel in the vault to the termination outlet at each device location. The Contractor shall ensure that all individual wires in all TWP cables have been terminated consistent with the wire insulation color to termination pin requirements set forth in this Special Provision. Swift Green Line—Corridor Stations Special Provisions SP195 May 2017