The answer to 'why is my electrical panel dimming lights' is that it could be caused by an overloaded or malfunctioning electrical panel. When an electrical panel is overloaded, it can cause the voltage to drop, resulting in dimming lights or other electrical issues throughout the home. This could be due to too many high-wattage appliances or devices being used at the same time, or a problem with the panel itself.
Some common symptoms of an overloaded or malfunctioning electrical panel include flickering or dimming lights, breakers that trip frequently, and warm or hot electrical outlets or switches. If you're experiencing these issues, it's best to have a licensed electrician inspect your electrical panel and make any necessary repairs or upgrades.