Testing emergency power system

This video was shot at a retirement community we're working on in Bonita Springs, FL. It's a test of the transfer time of a 1000kW generator.

Code requires that emergency generators complete a full transfer of power within 10 seconds of losing power from the utility in order to protect the building's occupants.

Here, we're simulating a loss of power by turning off circuit breakers in the main electrical room. What you'll hear is the electrician counting down before he turns off the breaker. The transfer switch senses the loss of power and sends a signal to the generator.

You'll then hear the generator ramp up to speed, then a loud bang, when the transfer switch sends thousands of watts of building load to the generator. And . . . it has to happen within 10 seconds.

This system passed the test with flying colors.