Why does the hotel power failure alarm sound?

The hotel power outage alarm may sound for the following reasons:

1. Voltage instability: When the storage battery of DC screen supplies power to various automatic switches and instrument power supplies of high-voltage system, the equipment will make noise.

2. Equipment problem: The equipment was in a hot state before the power failure, and began to cool down after the power failure. Due to the variety of materials used in the equipment, such as thickness and width, the cooling rate is different at different locations, which leads to uneven cooling shrinkage and noise after power failure.

The above are only possible reasons, and it is suggested to make a concrete analysis according to the actual situation.