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Electrical wiring in an old house: non-grounded outlets
I have limited knowledge when it comes to electrical wiring in a house. I can install new plugs and lightswitches, light fixtures, ceiling fans without killing myself. I learned all of this in a newer house where everything was grounded. I recently bought an older house (built in 1920) and my bedroom doesn't have any grounded outlets. The kitchen and bathroom do have 3-prong outlets that I've tested and they show up with a good ground connection.
In my bedroom, I could just swap in a 3-prong outlet and only connect the two wires, but since I will be plugging in my computer, lcd tv, stereo, etc...I don't really want to do that. I noticed some wires clamped to some pipes in the basement. I didn't trace them back to anything yet, but is there a chance this is how some of the plugs in my house are grounded? Is this a good way to ground an outlet?
TL;DR: How can I wire a ground for an electrical outlet in my old house?
Bonus question: Are surge protectors useless when plugged into a non-grounded outlet?