When any operations are to be performed, tools or materials handled, or equipment is to be moved or operated within the specified clearances of any high-voltage overhead lines, the person or persons responsible for the work to be done shall promptly notify the operator of the high-voltage line of the work to be performed and shall be responsible for the completion of the safety measures as required by Section 12.06.030 before proceeding with any work which would impair the aforesaid clearance.  (Ord. S-29555, 1976).