I don’t understand why 95% of the electrical appliances in a typical house don’t have ground prongs. In my house, the fridge, stove and computer do, but almost everything else doesn’t. I’ve heard about the theory of tools being double insulated, but what about lamps for instance. They never have a ground prong and often have metal frames. I could see the lamp wire inside burning up and coming in contact with the frame. Now the frame is hot and the juice can’t get to the grounding system. I don’t get it, with almost all houses having three prong outlets now and the emphasis on grounding.
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It's at least partly pragmatic. The number of electrocutions that occur with lamps is quite small, due to a number of factors. Things like refrigerators, however, have a history of developing hot-to-case shorts.
Also, with a lamp you're rarely near a good ground, while kitchen appliances are often located where simultaneous contact with a ground (by the person) is likely.
Computers have grounds for noise reasons, mostly, though it's basically just tradition now -- not as necessary as it was 20-30 year ago.
My guess is that it is history and probability.
If lamps where a new item they would probably have to be grounded, if metal based.
But historically there has not been that much of a problem with A) a failure where the metal becones hot B) that they are not used in areas where there are items around that are grounded where you can get between the "hot" lamp and a ground.