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1) All surge protectors require an equipment grounding conductor in order for the surge feature to work. Since your outlets are only 2 prong type, there is no ground on those receptacles. Thus, the surge protector does not indicate a ground since there is none.
2) The only way to provide a true equipment ground and use a 3 prong grounded receptacle and the surge protector is to install an equipment ground from the main electrical panel out to a 3 prong receptacle. This will involve additional wiring
on the existing circuit.
3) If you are concerned about a potential shock hazard, you can de-install the existing 2 prong receptacle and replace it with a 3 prong GFCI receptacle. The GFCI receptacle will still not provide a ground since no ground exists, but will provide against any potential shock hazards.
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