All public utility services shall be connected to an approved public utilities system where one exists. The developer shall arrange with the servicing utility for the underground installation of the distribution supply lines and service connections in accordance with the provisions of the applicable standard terms and conditions incorporated as part of its tariff, as the same are on file with the New Jersey State Board of Public Utility Commissioners; provided, however, that lots not part of a new major subdivision or site plan which abut existing streets where overhead electric, CATV or telephone distribution supply lines and service connections have heretofore been installed may be supplied with electric, CATV and telephone service from these overhead lines, but any new service connections from the utilities' overhead lines shall be installed underground. In cases where extension or replacement of service is needed to existing or new buildings in established subdivisions or developments, the present method of service may be continued. In the case of existing overhead utilities, however, should a road widening or an extension of service or such other condition occur as a result of the development which necessitate the replacement or relocation of such utilities, the developer shall cause the replacement or relocation to be underground.