Original General Order
Detailed Construction Requirements for Supply Lines
(Class H, L
and T Circuits)
58.6 Time Switches, Meters, Metal Boxes and Other Apparatus
A. Location and Clearances from Transformer, Capacitor or Regulator Cases
Time switches, meters and other apparatus, including their enclosures, which extend more than 5 inches from the surface of a pole shall not be installed on the surface of a pole shall not be installed on the surface of a pole supporting a transformer (or other equipment of similar dimensions), shall be not less than 4 feet above or below the nearest part of transformer case (or other equipment), unless the time switch, meter, etc., is installed on the side of the pole occupied by the transformer (or other equipment).
B. Clearance from Unprotected Conductors
On wood poles or structures, all grounded metal boxes and grounded metal cases for time switches, meters, or other apparatus shall be not less than 3 feet above or 6 feet below the level of unprotected supply conductors. Where it is impracticable to obtain a clearance of at least 6 feet below the level of unprotected supply conductors of 750 volts or less, a clearance of not less than 4 feet below such conductors will be permitted if a protective covering or guard is provided above the grounded surface.
C. Within 8 feet of the ground
Boxes or enclosures containing switches, meters, or other apparatus having accessible live parts, which are located 8 feet or less above the ground shall be effectively locked or sealed.
Metal Boxes which contain supply or control equipment or conductors and are located 8 feet or less above the ground shall be effectively grounded.