The answer to 'how to test surge protection' is to use a surge protector tester. This simple device plugs into the outlet and checks whether the surge protector is functioning properly and providing the necessary protection. It will indicate if the surge protector is working, if the grounding is correct, and if there are any wiring issues that could impact the surge protection.
It's recommended to test your surge protectors annually or any time you suspect an issue. This helps ensure your sensitive electronics are protected from power surges and spikes. If the tester indicates a problem, it's best to replace the surge protector rather than risk damage to your devices.