Vulcanized India Rubber Cable

Vir wires are available in sizes like 1 18 3 20 7 20 7 16 and 19 16.

Vulcanized india rubber cable.

Vir vulcanised indian rubber electrical cables b efore the introduction of pvc the majority of electrical cables used had vulcanised india rubber vir for insulation and protection. Vulcanised indian rubber or cables that were used throughout australia up until the 1950s. Twisted pair cotton rubber insulated with no outer sheath. Its main drawback is that sulfur reacts very quickly with copper and for this reason cables using vir insulation have a tinned copper conductor.

These are easily recognizable by their black exterior. The conductors are covered by vulcanized india rubber. Tough rubber sheathed trs vulcanized rubber insulated vri cables. The thickness of the vulcanized indian rubber depends on the voltage.

Along with imperial t e one of the most common historic wiring cables still in use. Prior to the use of pvc insulated cables becoming common in the 1960s most cables installed in domestic dwellings were of the rubber insulated tough rubber sheathed trs type. Finally it is dipped in bitumen compound. The vir cables were used in the majority of the wiring in properties and on the whole did not have an earth wire attached the continuous protective circuit.

Indian rubber cables were used in australia from the turn of the last century to the 1950s. Vulcanized india rubber has greater mechanical strength durability and wear resistant property than pure rubber. Here a 3 20 wire means numerator 3 denotes the number of conductors used and the denominator 20. These type of wires are used in 250v cts wiring casing or capping or cleat wiring and conduit wiring.

The vir insulation is generally used for low and moderate voltage cables. Tail rubber insulation tends to disintegrate and muck accumulates on cable ends causing leakage. Wires vulcanized india rubber in this type of wire a tinned copper conductors or aluminum conductors are used. Vulcanized india rubber has greater mechanical strength durability and wears resistant property than pure rubber.

The vir insulation is generally used for low and moderate voltage cables. Vulcanised india rubber insulated cable. This electrical wiring is insulated by cotton it s still found in many homes in sydney and poses a credible threat of both an electrical fire and electrocution. If you are living in a home that has not been inspected in some time it could be possible that the cables that can be found throughout your home may actually be made up of vir cables.

It is then covered with cotton tape and cotton braiding. Vir vulcanised indian rubber.