It is a statutory recommendation that all electrical systems in domestic dwellings should be tested every 10 years or at change of ownership of the property.
Periodic inspection and testing is necessary because all electrical installations deteriorate due to a number of factors, i.e. damage, wear and tear, corrosion, excessive electrical loading, ageing and other environmental influences.
Consequently, legislation requires that electrical installations are maintained in a safe condition and must therefore be periodically inspected and tested.
Licensing authorities, public bodies, insurance companies, mortgage lenders and others may require periodic inspection, testing and certification of electrical installations.