110
THE HONGKONG GOVERNMENT GAZETTE, MARCH 16,
1917.
Precautions
to be taken when bare conductors are used.
High pres- sure lines laid above
18. Where the conductors of electric lines placed in any conduit are not continuously covered with insulating material they shall be secured in position, and no unfixed uninsulated material of a conducting nature shall be contained in the conduit. No such conductor shall be at a pressure exceeding 300 volts from earth.
Adequate precautions shall also be taken to ensure that no accumula- tion of water shall take place in any part of the conduit, and to prevent any dangerous access of moisture to the conductors or the insulators.
The insulators of any such electric line shall be so disposed that they can be readily inspected; but this requirement shall not apply to any such insulators which before the date of these regulations were not required by any regulation then in force to be so capable of ready inspection.
19. Every portion of any high pressure electric line placed above the surface of the ground, or in any subway not in the sole occupation of ground or in the company, shall be completely enclosed either in a tube of highly insulating material embedded in brickwork, masonry, or cement concrete, or in strong metal casing efficiently connected with earth.
subways.
Protection for surface of ground
and electric lines.
Completion
and control
20. Where any high pressure electric line is laid beneath the surface of the ground, efficient means shall be taken to render it impossible that the surface of the ground or any neighbouring electric line or conductor shall become charged by leakage from the high pressure electric line.
21. A high pressure electric line shall not, except with the consent of the Director of Public Works, be used for the supply of energy before it of high pres- 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.
sure lines.
Sub-stations.
Street hoxes.
Maximum power in case of
Sub-stations and Street Boxes.
22. Sub-stations shall be established in suitable places and shall be in the sole occupation and charge of the company. Sub-stations shall be erected above ground wherever possible, but where necessarily under- ground, due provision shall be made for ventilation and for drainage.
23. In addition to the provisions contained in regulation 15 as to the construction of receptacles for electric lines, the following conditions shall be observed with respect to street boxes:-
(a) the covers of all street boxes shall be so secured that they cannot be opened except by means of a special appliance;
(b) the covers of all street boxes containing high pressure apparatus other than cables shall be connected to strips of metal laid immediately underneath the street, and efficient means shall be taken to render it impossible that the covers or other exposed parts of these boxes, or any adjacent material forming the surface of the street, shall become electrically charged, whether by reason of leakage, defect, or otherwise;
(c) where street boxes are used as transformer chambers, reasonable means shall be taken to prevent as far as possible any influx of water, either from the adjacent soil or by means of pipes; and in the case of any such street box exceeding one cubic yard in capacity, ample pro- vision shall be made, by ventilation or otherwise, for the immediate escape of any gas which may by accident have obtained access to the box, and for the prevention of danger from sparking;
(d) all street boxes shall be regularly inspected for the presence of gas, and if any influx or accumulation is discovered, the company shall give immediate notice to the company whose gas mains are laid in the neighbourhood of the street box;
(e) where mains at different pressures pass through the same street box they shall be readily distinguishable from one another.
24. The maximum power supplied to any underground sub-station or street box shall not, without the consent of the Director of Public Works, exceed 30 kilowatts in the case of a sub-station or street box underground sub-station, containing a single transformer, or 75 kilowatts in the case of a sub-
station or street box containing two or more transformers.
etc.
Respon- sibility
Consumer's Premises.
25. The company shall be responsible for all electric lines, fittings, and apparatus belonging to them, or under their control, which may for lines, etc., be upon a consumer's premises, being maintained in a safe condition on consumer's and in all respects fit for supplying energy.
of company
premises.
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