AUTOMATIC TRANSFER SWITCH MECHANICAL VISUAL INSPECTION
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Yes
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No
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1. Inspect for physical damage.
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2. Compare equipment nameplate information and connections with single line diagram and report any discrepancies.
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3. Check switch to insure positive interlock between normal and alternate sources.
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4. Check tightness of all cable connections and bus joints.
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5. Perform manual transfer operation.
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6. Transfer switch and compartment are clean and dust free.
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7. Verify all vendor control cable wiring.
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8. Check terminations and tagging.
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AUTOMATIC TRANSFER SWITCH ELECTRICAL FIELD TEST
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Yes
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No
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1. Perform insulation resistance tests phase to phase and phase to ground with switch in both alternate and source positions.
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2. Perform electrical insulation and contact resistance tests as referenced.
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3. Set and calibrate the Voltage Sensing relays. Contact PDD for settings.
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4. Set and calibrate the Transfer Time delay relay. Contact PDD for settings.
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5. Perform automatic transfer by simulating loss of normal power.
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6. Perform automatic transfer by return to normal power.
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7. Monitor and verify correct operation and timing of Normal Voltage sensing relays.
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8. Monitor and verify correct operation and time delay upon transfer.
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9. Monitor and verify correct operation and timing of Alternate voltage sensing relays.
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10. Monitor and verify correct operation and timing of Automatic transfer operation.
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11. Monitor and verify correct operation and timing of mechanical and electrical interlocks and limit switches
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12. Monitor and verify correct operation and timing, of time-delay and retransfer upon normal power restoration.
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