The limitations on height specified in Section 17.52.430 shall not apply:

    A.    Where a higher fence is required by any other ordinance of the county or by state or federal regulation;

    B.    Where a higher fence is made a condition of approval of a conditional use or a variance pursuant to this title, provided that no such condition shall require or permit a fence having a height in excess of twelve (12) feet;

    C.    To a fence around all or part of a tennis court, a playground or a swimming pool which is, at least in that portion which exceeds the applicable limitation, constructed of open wire or steel mesh capable of admitting not less than ninety (90) percent light as measured by a reputable light meter;

    D.    An open wire fence up to six feet high in an A district. (Prior gen. code § 8-60.56)