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City of Everett 26 05 73.13 -4 <br /> Inductive Charging Infrastructure for Everett Transit <br /> a. Voltage. <br /> b. Calculated symmetrical fault-current magnitude and angle. <br /> c. Fault-point X/R ratio. <br /> d. Calculated asymmetrical fault currents: <br /> 1) Based on fault-point X/R ratio. <br /> 2) Based on calculated symmetrical value multiplied by 1.6. <br /> 3) Based on calculated symmetrical value multiplied by 2.7. <br /> 3. Interrupting Duty Report: Three-phase and unbalanced fault calculations, <br /> showing the following for each overcurrent device location: <br /> a. Voltage. <br /> b. Calculated symmetrical fault-current magnitude and angle. <br /> c. Fault-point X/R ratio. <br /> d. No AC Decrement (NACD) ratio. <br /> e. Equivalent impedance. <br /> f. Multiplying factors for 2-, 3-, 5-, and 8-cycle circuit breakers rated on <br /> symmetrical basis. <br /> g. Multiplying factors for 2-, 3-, 5-, and 8-cycle circuit breakers rated on total <br /> basis. <br /> PART 3 -EXECUTION <br /> 3.1 POWER SYSTEM DATA <br /> A. Obtain data necessary for conduct of study. <br /> 1. Verify completeness of data supplied on one-line diagram. Call discrepancies to <br /> Architect's attention. <br /> 2. For equipment included as Work of this Project, use characteristics submitted <br /> under provisions of action submittals and information submittals for this Project. <br /> 3. For equipment that is existing to remain, obtain required electrical distribution <br /> system data by field investigation and surveys, conducted by qualified <br /> technicians and engineers in accordance with NFPA 70E. <br /> B. Gather and tabulate required input data to support short-circuit study. Comply with <br /> requirements in Section 017839 "Project Record Documents" for recording circuit <br /> protective device characteristics. Record data on Record Document copy of one-line <br /> diagram. Comply with recommendations in IEEE 551 as to amount of detail that is <br /> required to be acquired in field. Field data gathering must be by, or under supervision <br /> of, qualified electrical professional engineer. Data include, but are not limited to, the <br /> following: <br /> 1. Product Data for Project's overcurrent protective devices involved in overcurrent <br /> protective device coordination studies. Use equipment designation tags that are <br /> consistent with electrical distribution system diagrams, overcurrent protective <br /> device submittals, input and output data, and recommended device settings. <br /> 2. Obtain electrical power utility impedance at service. <br /> 3. Power sources and ties. <br /> 4. For transformers, include kVA, primary and secondary voltages, connection type, <br /> impedance, X/R ratio, taps measured in percent, and phase shift. <br /> 26 05 73.13 -4 SHORT-CIRCUIT STUDIES <br />