The answer to 'panel upgrade sparking' is that a sparking electrical panel is a serious issue that requires immediate attention. Sparking can be caused by a variety of problems, such as loose connections, overloaded circuits, or outdated equipment. Symptoms may include flickering lights, circuit breakers tripping frequently, and a burning smell coming from the panel.
If you're experiencing panel sparking, it's crucial to shut off power to the panel immediately and call a licensed electrician. Attempting to troubleshoot or repair the issue yourself can be extremely dangerous and should be avoided. A professional electrician will be able to diagnose the problem, make any necessary repairs or upgrades, and ensure the panel is safe and up to code.