Comes in 2 forms.
Vulcanized india rubber cable.
Vir wires are available in sizes like 1 18 3 20 7 20 7 16 and 19 16.
The thickness of the vulcanized indian rubber depends on the voltage.
The conductors are covered by vulcanized india rubber.
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.
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.
Its main drawback is that sulphur reacts very quickly with copper and for this reason cables using vir insulation have tinned copper conductor.
Wires vulcanized india rubber in this type of wire a tinned copper conductors or aluminum conductors are used.
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Tail rubber insulation tends to disintegrate and muck accumulates on cable ends causing leakage.
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.
Finally it is dipped in bitumen compound.
Vulcanised india rubber insulated cable.
Along with imperial t e one of the most common historic wiring cables still in use.
Vulcanised indian rubber or cables that were used throughout australia up until the 1950s.
Tough rubber sheathed trs vulcanized rubber insulated vri cables.
The vir insulation is generally used for low and moderate voltage cables.
Vulcanized india rubber has greater mechanical strength durability and wears resistant property than pure rubber.
It is then covered with cotton tape and cotton braiding.
These type of wires are used in 250v cts wiring casing or capping or cleat wiring and conduit wiring.
Vir vulcanised indian rubber.
Twisted pair cotton rubber insulated with no outer sheath.
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.
Vulcanized india rubber has greater mechanical strength durability and wear resistant property than pure rubber.
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.
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.
