【法规名称】
【法规编号】 79763 什么是编号？
【正 文】
第5页 CAP 406A ELECTRICITY SUPPLY REGULATIONS
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[接上页] (b) other means approved by the Director of Electrical and Mechanical Services;(II) from leakage by the provision- (a) in cases where metal poles are used, of- (i) an earthed wire, running from pole to pole and connected to the poles; or (ii) a suitable metal framework to support the insulators carrying the line conductors, the framework being insulated from the pole but connected to the neutral conductor; or (iii) other means approved by the Director of Electrical and Mechanical Services.(b) in cases where wooden poles are used, of- (i) a bonding wire connected to the supporting metal work of all insulators, the bonding wire terminating at the lowest part of the supporting metal work; or (ii) other means approved by the Director of Electrical and Mechanical Services.All stay wires other than those which are connected with earth by means of a continuous earth wire shall be insulated to prevent danger from leakage. For this purpose an insulator shall be placed in each stay wire at a height of not less than 10 feet from the ground. B-For voltages exceeding 650 volts direct current and 325 volts alternating current (15) 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. (16) The height from the ground of any line conductor at any point on 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 the height hereunder stated- Voltages not exceeding 66000 volts ............................................................. 20 feet Voltages exceeding 66000 volts and not exceeding 110000 volts .................... 21 feet Voltages exceeding 110000 volts and not exceeding 165000 volts .................. 22 feet Voltages exceeding 165000 volts ................................................................. 23 feet The height from the ground of an earth wire or auxiliary conductor shall not be less than the minimum heights prescribed in paragraph (13) above. (17) Adequate means shall be provided to render any line conductor dead or harmless to human beings or animals in the event of it falling, due to breakage or otherwise. All metal work other than conductors shall be permanently and efficiently connected with earth. For this purpose a continuous earth wire shall be provided and connected with earth at 4 points in every mile, the spacing between the points being as nearly equidistant as possible, or alternatively the metal work shall be connected to an effective earthing device at each individual support. The design and construction of the system of earth connections shall be such that when contact is made between a line conductor and metal connected with earth the resulting leakage current shall not be less than twice the leakage current required to operate the devices which make the line dead or harmless to human beings or animals. (17A) An overhead line carrying a voltage not exceeding 11000 volts may be erected on wooden poles and any line so erected shall comply with the requirements of- (a) specification No. 1320 of August 1946, issued by the British Standards Institution, with such modification thereto as may be for the time being in force; and (b) these regulations, except in so far as they are in consistent with the requirements of paragraph (a). (L.N. 236 of 1972)(18) Where an overhead line is erected along or across a public road or canal or across a railway all wires including earth wires and auxiliary conductors shall be placed at the appropriate height from the ground specified in paragraph (16) for line conductors, and the following additional precautions shall be taken to prevent danger- (a) in the case of a line erected along a public road or canal (or within 50 feet thereof) there shall be provided- (i) duplicate insulators supporting the conductors; or (ii) a device to ensure that in the event of a line conductor falling it shall be put to earth; or (iii) other means approved by the Director of Electrical and Mechanical Services;(b) in the case of a line erected across a public road, canal or railway there shall be provided- (i) duplicate insulators for supporting the line conductor and a device to ensure that in the event of a line conductor falling it shall be put to earth; or (ii) duplicate insulators supporting duplicate conductors tied at intervals not exceeding 5 feet; or (iii) other means approved by the Director of Electrical and Mechanical Services.(19) Supports shall be numbered consecutively and each support shall have a danger notice of a permanent character securely fixed to it. Adequate provision shall also be made to prevent unauthorized climbing. (20) All overhead lines shall be removed on ceasing to be used for the purposes for which they were erected. |
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