In those cases where such permit must be authorized by Council, Council may authorize the issuance of such permit upon such terms, provisions or conditions as Council deems necessary for the welfare of the general public, and may as a condition to the issuance of such permit, require that the power line or wire be installed underground. In such event such power line or wire shall be installed at a minimum depth of six feet below grade. It shall be backfilled by and laid in at least six inches of sand. It shall be standard underground pipe-type cable, lead covered, which shall meet the standard minimum A. E. I. C. pipe-type cable specifications for the voltage to be carried by such cable. Such line shall be encased in an enclosed sealed and welded steel pipe with protective sheath, having a somatic coating, such pipe may either be oil or gas filled and shall be capable of withstanding any maintained pressure. (Ord. 28-71. Passed5-3-1971.)