Paper-insulated cables are slowly being replaced by new cable systems which are of the polymeric type. However, there are yet a considerable amount of underground networks following the old technology. Though every new cable installation follows the new technology the old paper-insulated systems will be phased out slowly and till then they will need to be repaired, replaced or diverted in the times to come. This is where transition joints come into the picture. The important work of connecting the new and old cable technology is done by them; they act as a vital bridge between the two systems.
