Cloth Wiring
Pre-1960s cable insulated with cloth-covered rubber that becomes brittle and flakes off with age, exposing conductors inside walls and boxes.
Between knob and tube and modern NM cable, homes got early sheathed cables with rubber conductor insulation under woven cloth. The rubber is the weak point: after 70+ years it dries, cracks and crumbles, especially where heat accelerated aging (ceiling boxes under attic insulation, fixtures with oversized bulbs). Every electrician has opened a 1950s ceiling box and watched insulation fall off as dust.
Cloth wiring usually coexists with other era issues: two-wire ungrounded circuits, small fuse services, crowded boxes. Like knob and tube, it draws insurance attention, and the decision point is typically a renovation, sale or insurance renewal rather than a sudden failure.
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- Wire Gauge (AWG) : The thickness of a wire, measured in American Wire Gauge.
- Conduit : Protective tubing (metal or PVC) that individual wires are pulled through, used where cable would be exposed to damage, weather or burial: garages, outdoors, underground runs.
- Junction Box : An enclosed box where wires are spliced together.
- Aluminum Branch Wiring : Branch-circuit wiring installed in millions of homes from about 1965 – 1973 that develops loose, overheating connections at outlets and switches.