Now, this wasn’t exactly a surprise for me. After all, the property’s age, the original switches, and the lack of any electrical upgrade on file pretty much screamed “knob-and-tube still lurking here!” I called it before we even got to the living room, but explaining how to easily spot it’s likely presence (property’s age, original switches, and the lack of any new electrical permits on file) was still a fun moment to share with my clients.