What must you avoid doing when refueling with electrical power?

When refueling an aircraft with electrical power, it's essential to maintain the electrical systems' operational status to ensure safety and proper functioning of various onboard systems. If power is turned off, it may interrupt crucial operations, including fuel management and monitoring systems. Maintaining electrical power ensures that these systems can effectively manage the refueling process and respond appropriately to any issues that may arise.

This also helps in avoiding potential complications such as fuel spillage or fire hazards, which can arise when the systems responsible for monitoring the process are not operational. Keeping power on allows for proper communications and coordination among ground crew, minimizing risks during the refueling operation.