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Just install it anywhere in either panel that's convenient. If you really believe that some surge is going to enter and, if the unit is wired in one spot in one panel as opposed to another spot in the other panel will mean the difference between your stereo getting fried or not - you have fallen for the marketing hype of what surge arrestors are capable of.
 
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Thanks. My evolving beliefs about what a surge arrestor can do are certainly being informed by what I read here.
Don't think of it as a bubble of higher pressure water beginning at the point of fault and traveling along the wire into your panel... it is for all intents and purposes instantaneous that the voltage across the entire conductor simply rises relative to everything else.
 
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