1940
[Schedule contd.]
Circuit-breaker for high pressure mains, etc.
Trans-formers.
Connexion of trans-formers with earth.
Protection from lightning.
Report of accidents to Director of Public Works.
Overhead lines in case of low, medium, and high pressure supply.
No. 18 of 1911.
ELECTRICITY SUPPLY.
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.
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 of overhead lines for low, medium, and high pressure supply, and in the 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.
(2) The interval between any two wooden poles used singly as supports for an overhead line shall not exceed two hundred feet: Provided that where the line makes an angle at any such pole, the interval between that and the next pole shall not exceed one hundred and fifty 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.
(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 eighteen 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.
1940
[Schedule contd.]
Circuit-
breaker for high pressure mains, etc.
Trans- formers.
Connexion of trans- formers with earth.
Protection from lightning.
Report of accidents to Director of Public Works.
Overhead
fines in case of low,
medium, and high pressure supply.
No. 18 of 1911.
ELECTRICITY SUPPLY.
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.
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 us 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 of overhead lines for low, medium, and high prossure supply, and in the event of such overhead lines being situated under the verandali 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.
(2) The interval between any two wooden poles used singly as supports for an overhead line shall not exceed two hundred feet: Provided that where the line makes an angle at any such pole, the interval between that and the next pole shall not exceed one hundred and fifty feet.
In the case
of supports other than single wooden poles, the intervals between the sup- ports 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 arc erected on the three-wire system as hereinafter described, shall be so guarded that they cannot fall away from the support.
(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 eighteen 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.
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