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THE HONGKONG GOVERNMENT GAZETTE, MARCH 16, 1917.
(5) An overhead line, placed after the date of these regulations, shall not in any part thereof be at a less height from the ground than 18 feet, except with the consent of the Director of Public Works, and shall not be accessible to any person without the use of a ladder or other special appliance.
(6) Where a supply is given by overhead lines on the three-wire system, the positive and negative conductors shall be placed side by side above the intermediate conductor. The intermediate conductor shall consist of two wires placed side by side at a distance apart greater than that between the positive and negative conductors, and connected in each span by two cross wires placed in such a manner that in the event of either the positive or negative conductor breaking it shall fall on one at least of the cross wires.
(7) Where a supply is given by overhead lines from a two-wire system, with the negative conductor connected with earth, the positive conductor shall be placed above the negative conductor in such a manner that in the event of breakage it must fall on the negative conductor.
(8) Service lines from overhead lines shall be led as directly as possible to insulators firmly attached to some portion of the consumer's premises which is not accessible to any person without the use of a ladder or other special appliance. Every portion of any service line which is outside a building, and is within 7 feet from the building, shall be efficiently protected by insulating material.
(9) Where an overhead line crosses a street, the angle between the line and the direction of the street at the place of crossing, shall not be less than 60 degrees, except with the consent of the Director of Public Works, and the spans shall be as short as possible.
(10) Where an overhead line crosses, or is in proximity to, any other wire or metal, precautions shall be taken by the company against the possibility of the line coming into contact with the other wire or metal, or of the other wire or metal coming into contact with the line, by breakage or otherwise. In the case of all overhead lines in which the pressure exceeds 110 volts, guard wires shall be provided by the com- pany owning such lines. All guard wires must make good clectrical connection with the poles and be efficiently connected with earth.
.(11) Every overhead line, including its supports and all the structural parts and electrical appliances and devices belonging to or connected with the line, shall be duly and efficiently supervised and maintained as regards both electrical and mechanical conditions.
(12) The company shall remove any overhead line upon ceasing to use it for the supply of energy unless upon so ceasing they satisfy the Director of Public Works that they intend to bring it into use again within a reasonable time.
14. Save as above provided overhead lines shall not be erected except Other over- in accordance with such regulations as the Governor in Council may head lines. prescribe.
Electric Lines other than Overhead Lines.
15. All conduits, pipes, casings, and street boxes used as receptacles Construction for electric lines shall be constructed of durable material, and where of recept- laid under carriage ways shall be of ample strength to prevent damage acles for from heavy traffic, and reasonable means shall be taken by the com- pany to prevent accumulation of gas in such receptacles.
electric lines.
16. Where any electric line crosses, or is in proximity to, any Crossing metallic substance, special precautions shall be taken by the company pipes, etc. against the possibility of any electrical charging of the metallic substance from the line or from any metal conduit, pipe, or casing enclosing the line.
metal con-
17. All metal conduits, pipes, or casings containing any high pressure Electric con- electric line shall be efficiently connected with earth, and shall be so tinuity of jointed and connected across all street boxes and other openings as to duits, etc. of make good electrical connection throughout their whole length.
high pres- sure line.
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