Live Wire (electricity) - Wiring Methods - Other Historical Wiring Methods

Other Historical Wiring Methods

Other methods of securing wiring that are now obsolete include:

  • Re-use of existing gas pipes when converting gas light installations to electric lighting. Insulated conductors were pulled into the pipes formerly feeding the gas lamps. Although used occasionally, this method risked insulation damage from sharp edges inside the pipe at each joint.
  • Wood mouldings with grooves cut for single conductor wires, covered by a wooden cap strip. These were prohibited in North American electrical codes by 1928. Wooden moulding was also used to some degree in England, but was never permitted by German and Austrian rules.
  • A system of flexible twin cords supported by glass or porcelain buttons was used near the turn of the 20th century in Europe, but was soon replaced by other methods.
  • During the first years of the 20th century, various patented forms of wiring system such as Bergman and Peschel tubing were used to protect wiring; these used very thin fiber tubes, or metal tubes which were also used as return conductors.
  • In Austria, wires were concealed by embedding a rubber tube in a groove in the wall, plastering over it and then removing the tube and pulling in wires in the cavity.

Metal moulding systems, with a flattened oval section consisting of a base strip and a snap-on cap channel, were more costly than open wiring or wooden moulding, but could be easily run on wall surfaces. Similar surface mounted raceway wiring systems are still available today.

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