Ever wondered about how the pylon distribution transformer on the pole near your home is made? (inareas with underground power they are mounted on slabs) They have to be robust - ten years or more in fifty below to one hundred and twenty degree weather living through storms and taking lighting strikes. They've been around for a long time, but just work.
Oh .. and the sizing may be wrong if you and some of your neighbors plug in your electric cars at the same time...
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