Knob and tube replacement

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Knob and tube wiring (K&T) is an electrical wiring method commonly used between the 1880s and 1940s in North America. If your house was built before the 1950s, you might have a (K&T) electrical installation. In the early 1990s, two other wiring methods became available (conduit wiring and armored cable wiring) but the (K&T) method was by far the most affordable one, so it persisted until the cost of materials lowered, and the labor cost increase pushed for a more time-effective installation