Electrical Building Inspection Dunedin

VIR & TRS Wiring


(VIR and TRS cable wiring).

Vulcanised Indian Rubber (VIR) and Tough Rubber Sheathed (TRS) insulated cables are no longer used in residential dwellings (after the late 1950s), and have been replaced by  Tough Plastic Sheathed (TPS) insulated cables. During your building inspection if your HouseTest inspectors finds VIR or TRS wiring he will recommend a full electrical inspection. Many insurance companys consider VIR and TRS wiring to be a potential fire hazard and may ask you to rewire the building.

TPS Cabling


Tough Plastic Sheathed (TPS) insulated cables installed from 1960 is found in generally reasonable order during electrical building inspection Dunedin.

This is not to say that all old wiring found during a home inspection is necessarily a hazard. It depends on the condition of insulation protecting the wiring. Insulation can become damaged when it is rubbed or pierced, or even when a circuit is heavily loaded. When this happens, the wire becomes very hot and, over time, the insulation can crack or fray away.  Two most commonly known risks associated with electrical system are electrical shock casualties and electrical fires.  

Old Switch Boards



In New Zealand, the Electricity Act covers the safe production, distribution and usage of electricity. The Energy Safety Service (ESS) is responsible for the administration the Act. ESS aims to bring a clear focus to safety, supply and measurement across the electricity sector. The safety of electricity supply in domestic dwellings fits within the work of ESS.

ESS conducted a research project during 2003/4 financial year to determine the safety risk in domestic premises or residential dwellings from wiring systems in New Zealand and especially the wiring system employed in the early 1940s and 1950s (VIR and TRS cable wiring).