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Tip #27 - We interrupt this test...

By Jonathan Flannery posted 12-03-2018 11:54


tip-27-we-interrupt-this-test.png The 10-second criterion shall not apply during the monthly testing of an essential electrical system. If the 10-second criterion is not met during the monthly test, a process shall be provided to annually confirm the capability of the life safety and critical branches to comply with

Annually interruption of power required for proper ATS testing.


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1 comment



12-06-2018 11:36

​ states "after interruption of the normal source." By utilizing the transfer switch each month, this is not an interruption, it is a simulated signal from the ATS. This would indicate that a "dead-bus" test would be required annually?