The minimum vertical clearance above the highway at the largest vertical sag of the line is 22 feet for electric lines, and 18 feet for communication and cable television lines. Longitudinal lines on the right of way shall be limited to single pole construction on each side of the right of way, unless otherwise authorized by the district. Where an existing or proposed utility facility is supported by "H" frames, the same type structures may be utilized for the crossing. (a) Type of construction. The National Electrical Safety Code, published by the Institute of Electrical and Electronics Engineers, sets clearances ranging. Establishing minimum height requirements prevents unintentional snagging by tall equipment or vehicles and reduces the risk of injury to individuals carrying long objects like ladders or fishing rods. The lowest minimum clearances for communication lines are designated for areas accessible only to. A municipal electric utility shall construct, operate, and maintain its transmission lines and distribution lines along highways and at other places in accordance with the national electrical safety code.
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