A. All wires or cables on the exterior of buildings, where exposed to moisture, shall be supported on petticoat insulators placed at intervals not exceeding fifteen feet (15'); this interval being decreased if wires are subject to disturbance. The insulators shall be so designed or located as to hold individual wires, at least twelve inches (12") apart and at least two inches (2") from the surface wired over; provided, however, that brackets, racks, supports, or insulators especially approved for the location may be used if they separate individual wires at least six inches (6") and are placed at intervals not exceeding seven feet (7').
B. Wires not exposed to the weather may be supported on glass or porcelain knobs placed at intervals not exceeding four and one-half feet (41/2') and retaining the wires at least one inch (1") from the surface wired over. All wires must be so spliced or joined so as to be both mechanically and electrically secure, without solder, and all splices made within three feet (3') of any building or woodwork shall then be soldered. All joints must then be covered with an insulation equal to that on the conductors. (Prior code § 8-4-12)