927.05 CROSSARMS AND WIRES.
   All crossarms shall be attached to the pole in a gain of not less than one-half inch deep, with a five-eighths inch through bolt; and braced with two braces set down the pole the same distance they are out from the center of the pole, to be on the outside of the crossarm bent to meet the pole parallel with the pole. Wire for electric light and power shall not be less than No. 8 for voltages up to 750 volts and not smaller than No. 6 for all voltages of over 750. All wires shall be weatherproof triple braid cotton. Bare wires shall be prohibited for use on any electric light or supply lines.
(1961 Code Sec. 304)