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Looks like the original fuses were replaced at some point with Square D QS? Or QO? Breaker Box.

I don't see an isolated ground bar on the inside of the box however. The screws that typically ...

I need to convert an old cinder block house from 2 wire outlets to 3 wire by adding a ground to all outlets.

Since the entire house is cinder block, all the circuits from the basement breaker box...