High-voltage overhead lines on wood poles for line voltages up to and including 11 kV, with conductors not exceeding 0.05 sq in
木杆上的高压架空线路 线路电压不超过11 kV 导线不超过0.05平方英寸
This specification applies to both three-phase and single-phase high voltage distribution lines where the normal working pressure between any conductor and earth does not exceed 6 · 6 kV, the maximum size of conductor as being set out in clause 4.