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Surge Protectors 

A surge protector (or spike suppressor, or surge suppressor, or surge diverter) is an appliance or device designed to protect electrical devices from voltage spikes. Surge protectors for homes can be in power strips used inside, or a device outside at the power panel.

A modern house has three wires, Line, Neutral, and Ground (L,N, and G). Many protectors will connect to all three, in pairs, L-N,L-G,and N-G, since there are conditions, like lightning, where both L and N have high voltage spikes that need to be shorted to ground.