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Transformers are safe unless they are connected to cross country wires, which act as giant antennas, collecting energy from an EMP or a solar flare.

Like they say in horror movies: "It's coming from outside the Faraday Cage".

True, a transformer sitting in the middle of a warehouse is pretty safe. Unfortunately most of them actually in use have these huge current-carrying electrical wires running right that "faraday cage"...