b'Power Quality at the Service PanelVoltage sags, tripping breakers, overheated electrical panels, and excessive voltage levels are all indications of possible trouble in an electrical distribution system. It is helpful to understand that these symptoms are telling us something is wrong with the power system. But where oh where do you begin the search to isolate the exact cause of these power quality problems?Just like cars have a single connection point to monitor vital functions, the electrical system has a similar connection point: the electrical service panel. As a common point for branch circuit distribution, the service panel is also a convenient place to take the pulse of your electrical system.A number of problems can be located right in the service panel itself. For problems elsewhere in the system, measurements at the service panel can tell you where to look next. Some problems can be caught by a quick visual inspection, while others require that measurements be taken.36'