Valdez Construction 6/12/2023 - Laserfiche WebLink

City of Everett 26 05 73.16 - 5 Inductive Charging Infrastructure for Everett Transit PART 3 - EXECUTION 3.1 EXAMINATION A. Examine Project overcurrent protective device submittals for compliance with electrical distribution system coordination requirements and other conditions affecting performance of the Work. Devices to be coordinated are indicated on Drawings. 1. Proceed with coordination study only after relevant equipment submittals have been assembled. Overcurrent protective devices that have not been submitted and approved prior to coordination study may not be used in study. 3.2 POWER SYSTEM DATA A. Obtain data necessary for conduct of overcurrent protective device study. 1. Verify completeness of data supplied in one-line diagram on Drawings. Call discrepancies to Architect's attention. 2. For equipment included as Work of this Project, use characteristics submitted under provisions of action submittals and information submittals for this Project. 3. For equipment that is existing to remain, obtain required electrical distribution system data by field investigation and surveys, conducted by qualified technicians and engineers. Qualifications of technicians and engineers must be in accordance with NFPA 70E. B. Gather and tabulate required input data to support coordination study. List below is guide. Comply with recommendations in IEEE 551 for amount of detail required to be acquired in field. Field data gathering must be by, or under supervision of, qualified electrical professional engineer. Data include, but are not limited to, the following: 1. Product Data for overcurrent protective devices specified in other Sections and involved in overcurrent protective device coordination studies. Use equipment designation tags that are consistent with electrical distribution system diagrams, overcurrent protective device submittals, input and output data, and recommended device settings. 2. Electrical power utility impedance at service. 3. Power sources and ties. 4. Short-circuit current at each system bus (three phase and line to ground). 5. Full-load current of loads. 6. Voltage level at each bus. 7. For transformers, include kVA, primary and secondary voltages, connection type, impedance, X/R ratio, taps measured in percent, and phase shift. 8. For reactors, provide manufacturer and model designation, voltage rating, and impedance. 9. For circuit breakers and fuses, provide manufacturer and model designation. List type of breaker, type of trip and available range of settings, SCCR, current rating, and breaker settings. 10. Generator short-circuit current contribution data, including short-circuit reactance, rated kVA, rated voltage, and X/R ratio. 11. For relays, provide manufacturer and model designation, current transformer ratios, potential transformer ratios, and relay settings. 12. Maximum demands from service meters. 26 05 73.16 - 5 COORDINATION STUDIES