My house was built sometime between 1900 and 1937, depending on which documents you believe. In some places the electrical wires are secured inside the walls with ceramic insulators. This makes me think they weren’t too confident about the paper or whatever insulation the wires were wrapped in, so the insulators were an extra way of preventing wire from contacting wood other other building materials. I’ve heard this was standard, but still seems terrifying to me. It looks like the way electric fences are set up to contain livestock, with wires secured to posts by ceramic or plastic insulators.
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