i think i'm too young for this "knob and tube" thing. can anyone care to explain?
Taken from Wikipedia
Knob and tube wiring (sometimes abbreviated
K&T) was an early standardized method of
electrical wiring in buildings, in common use in North America from about 1880 to the 1930s.
[1][2] It consisted of single insulated
copper conductors run within wall or ceiling cavities, passing through
joist and
stud drill-holes via protective porcelain insulating
tubes, and supported along their length on nailed-down porcelain
knob insulators. Where conductors entered a wiring device such as a lamp or switch, or were pulled into a wall, they were protected by flexible cloth
insulating sleeving called "loom". The first insulation was asphalt-saturated cotton cloth, then rubber became common. Wire splices in such installations were twisted for good
mechanical strength, then
soldered and wrapped with rubber insulating tape and
friction tape (asphalt saturated cloth), or made inside metal junction boxes.
Knob and tube wiring was displaced from interior wiring systems because of the high cost of installation compared with use of power cables, which combined both power conductors of a circuit in one run (and which later included grounding conductors).