51054-1917-Regulations-under-the-Electricity-Supply-Ordinance-1911 — Page 3

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THE HONGKONG GOVERNMENT GAZETTE, MARCH 16, 1917.

Testing of insulation of all parts of high

pressure circuit.

Mainten- ance of insulation.

Circuit- breaker for high pressure mains, etc.

Trans- formers.

Connection of trans- formers with

earth.

Protection from lightning.

Report of accidents to Director of Public Works.

Overhead

6. A high pressure circuit shall not be brought into use unless the insulation of every part thereof has withstood the continuous application, during one hour, in the case of every electric line, of a pressure equal to the full working pressure to which it is intended to be subjected in use, and, in the case of every machine, device, or apparatus, of a pressure equal to the full working pressure to which it is intended to be subjected.

The company shall duly record the results of each test.

77. There shall be maintained by the company at each station or sub- station as may be necessary a leakage indicator of approved pattern and so arranged that the leakage on each main feeder can be readily ascer- tained at any time and a weekly test recorded. If at any time the leak- age is in the opinion of the Director of Public Works excessive, he shall require the company to remedy the same and it shall forthwith be remedied.

Provided that where any part of any electric circuit is connected with earth, either in accordance with these regulations or with the approval of the Director of Public Works, the provisions of this regulation shall not apply to that part of that circuit so long as the connection with earth. exists.

8. Every high pressure main, conductor, or other apparatus shall be protected by a suitable fuse or automatic circuit-breaker.

Provided that it shall not be incumbent upon the company to provide such a fuse or circuit-breaker for the outer conductor of a concentric main which is, in accordance with these regulations or with the approval of the Director of Public Works, efficiently connected with earth.

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9. In every case where a high pressure supply is transformed for the purpose of supply to one or more consumers, some suitable automatic and quick-acting means shall be provided to protect the consumer's wires from any accidental contact with or leakage from the high pressure circuit, either within or without the transforming apparatus.

10. The metallic portion of every high pressure transformer, with the exception of the conductors thereof, shall be efficiently connected with earth except in respect of transformers supported on poles at such a height as to be inaccessible except by the use of a ladder or other special appliance Provided that in such cases such poles shall be efficiently connected with earth.

11. Where any portion of any electric line or any support for any electric line is exposed in such a position as to be liable to cause injury from lightning, it shall be efficiently protected against such liability.

12. Where any accident by explosion or fire, or any other accident of such kind as to have caused or to be likely to have caused loss of life or personal injury has occurred at any part of any electric line or work, the company shall give immediate notice thereof to the Director of Public Works.

Overhead Lines.

13.--(1) The provisions of this regulation shall have effect in the case lines in case of overhead lines for low, medium, and high pressure supply, and in the of low,

event of such overhead lines being situated under the verandah or balcony of any building the Director of Public Works shall determine how far and to what extent the provisions of this regulation shall apply.

medium.

and high pressure supply.

(2) The interval between any two wooden poles used singly as sup- ports for an overhead line shall not exceed 200 feet: provided that where the line makes an angle at any such pole, the interval between that and the next pole shall not exceed 150 feet. In the case of supports other than single wooden poles the intervals between the supports shall be such as may be prescribed by the Director of Public Works.

(3) Every support for an overhead line shall be of a durable material, and shall be properly stayed against forces due to wind pressure, change of direction of the line, or unequal lengths of span. The factor of safety shall be for overhead lines, at least 5, and for wooden poles at least 10, and for iron or steel structures at least 6, taking the maximum possible wind pressure at 40 pounds per square foot.

(4) All overhead lines shall be attached to insulators, and in the case of lines in which the pressure exceeds 110 volts, unless such lines are erected on the three-wire system as hereinafter described, shall be so guarded that they cannot fall away from the support.

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