【法规名称】
【法规编号】 79763 什么是编号？
【正 文】
第4页 CAP 406A ELECTRICITY SUPPLY REGULATIONS
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[接上页] (5) Where a line conductor crosses over or under or is in proximity to any other overhead wire, precautions shall be taken by the company to prevent contact, due to breakage or otherwise, between the line conductor and the other overhead wire, or between the other wire and the line conductor: Provided that this paragraph shall not be deemed to require the company to take precautions against contact between a broken line conductor and other auxiliary conductors and earth wires carried on the same support and forming part of the same overhead line. (6) Line conductors shall be attached to suitable insulators carried on supports of iron, steel, reinforced concrete or wood. Special precaution shall be taken to prevent the corrosion of all metal work at or below the surface of the ground. (L.N. 236 of 1972) (7) The supports, in conjunction with stays or struts if provided, shall withstand the longitudinal, transverse and vertical loads due to the wind pressure hereinafter specified without damage and without movement in the ground. In no case shall the strength of a support in the direction of the overhead line be less than one-quarter the required strength in a direction transverse to the line. The following factors of safety shall apply to each support- Material Factor of safety Iron or steel ................................................................................ 3 Reinforced concrete .................................................................... 4 Wood ......................................................................................... 3 These factors of safety shall be calculated on the assumption that all line conductors, cables and wires carried by the supports are at a temperature of 70 degrees Fahrenheit, and that together with the supports they are subjected to a wind pressure of 40 lb. per square foot. (L.N. 236 of 1972) (8) Service lines shall be connected to line conductors at a point of support only and shall be fixed to insulators on consumers' premises. Every part of a service line (other than a neutral conductor connected with earth) which is accessible from a building with the use of a ladder or other special appliance shall be efficiently protected either by insulating material or by other means approved by the Director of Electrical and Mechanical Services. (9) Where line conductors forming parts of systems at different voltages are erected on the same poles or supports adequate provision shall be made to guard against danger to linesmen and from the lower voltage system being charged above its normal voltage by leakage from or contact with the higher voltage system; and the type of construction shall be subject to the prior approval of the Director of Electrical and Mechanical Services. (10) Every overhead line, including its supports and structural parts, and electrical appliances and devices belonging to or connected therewith, shall be regularly inspected and efficiently maintained. (11) All materials used shall at the time of erection conform to the specifications for the time being in force of the British Engineering Standards Association and the Post Office (London) for the construction of aerial lines, so far as the same are applicable and are not inconsistent with this regulation. PART II SPECIFIC (Applicable according to the voltage between line conductors where no part of the system is connected with earth, or according to the voltage to earth where part of the system is connected with earth.) A-For voltages not exceeding 650 volts direct current and 325 volts alternating current (12) The factor of safety of line conductors shall be 2. The factor of safety shall be based on the breaking load and shall be calculated on the assumption that the line conductors are at a temperature of 70 degrees Fahrenheit and that they are subjected to a wind pressure of 40 lb. per square foot. (13) The height from the ground of any line conductor (other than a service line), earth wire or auxiliary conductor at any point of the span at a temperature of 160 degrees Fahrenheit shall not, except with the consent of the Director of Electrical and Mechanical Services, be less than 19 feet across a public road or 17 feet in other positions. A height of 15 feet may be adopted in situations inaccessible to vehicular traffic. Where a service line is carried across or along a carriage-way, the height of the line from the ground at any part of the carriage-way shall not, except with the consent of the Director of Electrical and Mechanical Services, be less than 19 feet and 17 feet respectively. (14) Where the voltage to earth exceeds 250 volts direct current or 125 volts alternating current, precaution should be taken to prevent danger, (I) from a broken line conductor by the provision of- (a) a neutral or earthed conductor carried continuously from pole to pole, and so arranged in relation to the other conductors that in the event of breakage of any one of them the line conductor shall make contact with the earthed wire; or |
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