【法规名称】
【法规编号】 79763 什么是编号？
【正 文】
第8页 CAP 406A ELECTRICITY SUPPLY REGULATIONS
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[接上页] (2) An extra high pressure main shall not be brought into use unless, after it has been placed in position and before it is used for the purposes of supply, the insulation of every part thereof has withstood the continuous application, during half an hour, of pressure exceeding the maximum pressure to which it is intended to be subject in use, that is to say, in the case of every electric line to be used for a pressure not exceeding 10000 volts twice the said maximum pressure, and in the case of a line to be used for a pressure exceeding 10000 volts, a pressure exceeding the said maximum pressure by 10000 volts; and the company shall record the results of the tests of each main or section of a main. (3) Every extra high pressure main shall be protected by a suitable fuse or automatic circuit-breaker, but in the case of a concentric main that fuse or circuit-breaker shall not be inserted in any external conductor thereof which is connected with earth. (4) In every case where an extra high pressure supply is transformed or converted to a reduced pressure, some suitable automatic and quick-acting means shall be provided to protect the reduced pressure circuits from any accidental contact with or leakage from the extra high pressure system, either within or without the transforming or converting apparatus. (5) All metal conduits, pipes or casings containing any extra high pressure electric line shall be efficiently connected with earth and shall be so jointed and connected across all street boxes and other openings as to make good electrical connection throughout their whole length. (6) Every portion of any extra high pressure electric line placed above the surface of the ground, otherwise than in a sub-station, or in any subway not in the sole occupation of the company, shall be completely inclosed either in a tube of highly insulated material embedded in brickwork, masonry or cement-concrete, or in strong metal casing efficiently connected with earth. (7) (a) Where extra high pressure mains for three-phase supply consist of insulated conductors laid together, provision shall be made to ensure that neither the ground nor any neighbouring or electric line or conductor can become charged by leakage from any such main. (b) Where this provision is made by a copper strip under a lead sheath that strip shall be not less than sixteen-thousandths of an inch in thickness, and where it is made by steel wires outside a lead sheath each of those wires shall be not less than one-tenth of an inch in diameter. (c) Where the mains are inclosed in a lead sheath the sheath shall be not less than one-tenth of an inch in thickness and shall be permanently and efficiently connected with earth.(8) Extra high pressure mains for single phase supply and all cables connected therewith shall consist either of 2 concentric conductors or of separate conductors. Where concentric conductors are used the insulation shall be maintained efficiently throughout except that the outer conductor shall be connected with earth at 1 point, and where separate conductors are used provision shall be made as in the case of mains for three-phase supply to ensure that neither the ground nor any neighbouring electric line or conductor can become charged by leakage. (9) An extra high pressure electric line shall not be brought into use for the supply of energy before it has been completely laid, properly jointed, examined and tested or until it is in the sole charge of the company, and every such line shall during its use be in the sole charge of the company. (10) Extra high pressure mains shall not pass through the same street box with other mains, unless they are inclosed in strong metal casing; and street boxes containing high pressure mains shall not contain pipes for water, gas or other service, or electric mains belonging to another undertaking: Provided that any such street box may contain telephone wires belonging to the company. (11) Sub-stations supplied at extra high pressure shall be established in suitable places and shall be in the sole occupation of the company. (12) Sub-stations constructed below the surface of any street after 2 December 1921, to which an extra high pressure is to be given shall not contain switches or apparatus other than transformers. (13) The transforming apparatus at any sub-station supplied at extra high pressure shall be so arranged that there shall be no danger of any mains connected therewith being charged to any pressure beyond the limits of pressure for which those mains are intended. (14) In delivering the energy to a sub-station at extra high pressure the company shall exercise all due precautions so as to avoid risk of causing fire on the premises. (15) All extra high pressure electric lines and apparatus placed in a sub-station shall be highly insulated and thoroughly protected against injury to the insulation or access of moisture, and any metal forming part of the electric circuit shall not, unless efficiently connected with earth, be exposed so that it can be inadvertently touched. All such lines shall be so fixed and protected as to prevent the possibility of electrical discharge to any adjacent metallic substance. |
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