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Power Interruption when Manual Bypass Switch was miss-operated.

During a recent UPS PM, the Manual Bypass Switch was miss-operated by maintenance personnel from the Bypass to Normal position. The switch in the normal position is at the 10 o'clock position and in the bypass position is at 2 o'clock.

The switch was forced to the 9 o'clock position and opened, this de-energized all connected loads. Make sure

you do not force a Manual Bypass Switch to a position it was not designed for.