General Order 64-A
Detailed Construction Requirements For Supply Lines
(Class H, L and T Circuits)
A. Protection Against Corrosion (see Rule 49.8)
Separation From Metal Pins.
Metal crossarms braces shall not contact metal pins on wood crossarms which carry more than one circuit; nor on arms supporting single circuits if the lower extremity of the brace falls within a 3 foot vertical distance of the conductor next below.
Separation From Bond Wires and Ground
Bond wires and ground wires shall not contact metal pins, bolts, etc. on wood crossarms except where same are intended to be connected, in which case a positive electrical contact shall be made.
Metal Back Braces
The use of metal back braces is discouraged. Where used they shall be considered as one of the arms of double arm construction.
Hardware of a circuit which of itself is a common bond shall be grounded where it is possible to work on one side of the circuit or circuits while the other is energized. The conductor used for grounding shall not have a conductivity of not less than No. 6 A.W.G. copper wire.