Before starting a standby generator, which switch position is required to prevent current from feeding in reverse to the power supply?

To ensure that no current feeds back into the power supply when starting a standby generator, the double-pole, double-throw switch must be in the “off” position. This specific switch configuration is designed to safely isolate the generator from the main power grid. When the switch is in the "off" position, it breaks the connection between the generator and the utility power supply, thereby preventing any reverse current flow that could potentially damage both the generator and the electrical service.

This practice is essential for safety, as the primary goal is to ensure that during a power outage and while operating a generator, there is no risk of electricity being sent back into the grid. Such reverse flow can create hazardous situations for utility workers who may be working to restore power.

Correctly positioning the switch in the "off" state before starting the generator is a critical safety protocol, ensuring that all power sources are properly disconnected and that the generator can operate independently until it’s necessary to reconnect to the grid.