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the hole house protector tries to deflect a spike to ground away from your appliances . it is transparent to you , until it can't do it's job .
but surges and spikes can get very very powerful and many times the protector is just not enough to prevent to much from getting through .
you usually need multi levels to really do a great job of it .
many use mov's which get weaker and weaker with each jolt until you have no protection . like boxer taking punches many get their ability reduced with each hit .
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