What does backfeed refer to in electrical systems?

Backfeed refers specifically to the situation where electrical power is sent back into the electrical grid or systems from a load, rather than being drawn from the main power source. This typically occurs when there is a generation source, such as a generator, connected to a system that is not designed primarily for that power to flow in reverse.

When a generator is supplying power to a system while simultaneously connected to the main grid or utility, without proper safety protocols, power can flow back into the utility lines. This can create a hazardous condition, especially for workers who are repairing lines or equipment, as they might be exposed to unexpected electrical energy from that backfeed.

Understanding the concept of backfeed is critical for safety and proper operational procedures, as it can lead to dangerous scenarios if workers are unaware of a potential live power source coming from the load side of the system. This knowledge helps in establishing safety considerations, such as the implementation of transfer switches or disconnects to ensure that backfeed does not occur inadvertently.