THE HONGKONG GOVERNMENT GAZETTE, MARCH 16, 1917.
(8) Extra high pressure mains for single phase supply and all cables connected therewith shall consist either of two 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 one 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 enclosed 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 the date of these regulations to which an extra high pressure is to be given shall not contain switches or other apparatus 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 maius 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.
(16) The Director of Public Works shall be entitled to enter at all times any of the generating or sub-stations of the company supplying or supplied at an extra high pressure, and to make any such examination and tests of the mains, machines, transformers, or other apparatus in use in those stations, as may appear to him necessary, and the company shall afford all due facilities for any such examination and tests.
(17) Where any extra high pressure circuit is connected with earth, the connection shall be made at one point only, namely, at the generating station, sub-station, or transformer, and the insulation of the circuit shall, except at that point, be efficiently maintained throughout.
(18) The neutral point of the star winding of each distinct three- phase circuit, used for extra high pressure, may be connected with earth, or may be insulated. If connected with earth through a resistance, that resistance shall be sufficiently low to ensure that the fuse or automatic circuit-breaker in the mains shall act.
If the neutral point is not connected with earth, a separate electro- static voltmeter placed in a conspicuous position in the generating station shall be connected between each distinct circuit and earth; and if the indications of the voltmeters show that the insulation of any of the circuits is faulty, immediate steps shall be taken to restore the insulation..
Penalties.
40. If the company make default in complying with any of the pre- Penaltics ceding regulations, they shall, on summary conviction, be liable to a for default. penalty not exceeding 100 dollars for every such default, and in the case
of a continuing offence to a further penalty not exceeding 100 dollars for
each day during which the offence continues.
The recovery of a penalty under these regulations shall not affect the liability of the company to make compensation in respect of any damage or injury which may be caused by reason of the default.
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