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<br />. <br />. . <br /> <br />',", <br /> <br />APPENDIX B - Preventive Maintenance <br /> <br />Electrical System Preventive Maintenance <br /> <br />City Data Centers and the Telephone Center operate for 24 hours a day, 7 days a week, and <br />very rarely shut down for any reason. The electrical infrastructure used to deliver power to <br />equipment in these City centers all require periodic preventive maintenance to insure their <br />proper operation and optimal performance. <br /> <br />Part I. The preventive maintenance (PM) switchboards, panelboards, circuit breakers, <br />fuses, electrical feeders, and cables will include but not be limited to: <br /> <br />1. The System should be inspected during normal operation by: <br /> <br />a. Check and record load balance and voltage. <br />b. Visually inspect cable terminations for heat build-up or discoloration. <br />c. Inspect temperature of terminations, panels, breakers and switches with an <br />infrared heat gun or perform thermo graphic inspection. <br />d. Inspect as-built electrical records as up-to-date and accurate. <br />e. Verify labeling of panels and breakers. <br />f. Verify required working clearance in front of all electrical equipment. <br /> <br />2. After the system has been completely shut-down and all electrical equipment is de- <br />energized, the following should be performed: <br /> <br />a. Tighten all cable terminations and lug for feeder cables. Torque as per <br />manufacturer specifications. <br />b. Replace any discolored cable or terminations. <br />c. Correct any other problems including any found during PM inspection phase. <br />d. Perform insulation resistance test, if necessary. <br />e. Tighten all bus bar connections and replace any hardware, if necessary. Spring <br />washers should be used for all terminations. <br />f. Re-torque any circuit breaker bus and monitoring hardware connections. <br /> <br />Part II. The preventive maintenance (PM) Power Distribution Unit (PDU) will include but not <br />be limited to: <br /> <br />1. Open and visually inspect cabinet interior. <br /> <br />2. Measure and record input/output voltages and frequency with calibrated digital <br />voltmeter. <br /> <br />3. Check heat buildup on terminals and connections within the unit by using an infrared <br />heat sensor gun or infrared scan. <br /> <br />4. Inspect, test, and record status panel readouts and associated indicator lamps for <br />proper operation and accuracy. <br /> <br />5. Check branch circuit breaker and cable connections. <br /> <br />Page 13 of 25 <br /> <br />EXHIBIT A 6 <br />