EGSA Electrical Generator Systems Technician Certification Exam

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An Automatic Transfer Switch (ATS) controller includes a time delay feature for re-transferring the load from the emergency source back to the normal utility source. What is the primary purpose of this re-transfer time delay?

To allow the generator a cool-down period before shutting down. To verify that the restored utility power is stable and not fluctuating. To prevent the generator from starting unnecessarily during very brief outages. To allow large motor loads to de-energize completely before switching.

Correct Answer:

To verify that the restored utility power is stable and not fluctuating.

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