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TO: All Departments with Space in TU-3 and TU-4</div>
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DATE: December 2025</div>
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SUBJECT: Generator Test: TU-3 and TU-4</div>
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<b>Generator testing for TU3 & TU4 is scheduled for </b><span style="color: rgb(200, 38, 19);"><b>Tuesday, December 16, 2025</b></span><b>, as follows:</b></div>
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The test, although intended to simulate an actual power outage, has been modified to keep the disruption to hospital services at a minimum. If an actual power outage occurs, the electrical circuits supported by the generator will be without power for 5 to
10 seconds except for those areas which have their own uninterruptible power supplies. Our recent experience suggests that a real power outage can be expected once a year. If you have equipment, processes, etc. that cannot cope with a power outage of this
duration, your department should consider installing uninterruptible power supplies (UPS's).</div>
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THE <b>TU-3</b> TEST PROCEDURES ARE AS FOLLOWS:</div>
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• The emergency generator will be started between 6:00 AM and 6:05AM and will be used as the source for emergency power for approximately 30 minutes.</div>
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• The emergency power will be switched back to normal between 6:30AM and 6:35AM when the generator turns off.</div>
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• Emergency outlets (red) and emergency lights will blink when the test starts and again when it ends.</div>
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THE <b>TU-4</b> TEST PROCEDURES ARE AS FOLLOWS:</div>
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• The emergency generator will be started between 7:00AM and 7:05AM and will be used as the source for emergency power for approximately 30 minutes.</div>
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• The emergency power will be switched back to normal between 7:30AM and 7:35AM when the generator turns off.</div>
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• Emergency outlets (red) and emergency lights will blink when the test starts and again when it ends.</div>
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<span style="background-color: rgb(255, 255, 0);">If you have any questions or concerns regarding the test or the emergency power system, please feel free to contact Marc Dingle, Electrical Facilities Manager at 4-8923 or 680-323-1819.</span></div>
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Your continued cooperation in completing the code mandated emergency diesel generator test is greatly appreciated.</div>
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