THE HONGKONG GOVERNMENT GAZETTE, MAY 19, 1911.
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215
tions to be
18. Where the conductors of electric lines placed in Precau any coudnit are not continuously covered with insulating taken material they shall be secured in position, and no when bare unfixed uninsulated material of a conducting nature shall conductors be contained in the conduit. No such conductor shall are used. be at a pressure exceeding 300 volts from earth.
Adequate precautions shall also be taken to ensure that no accumulation 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.
laid above
19. Every portion of any high pressure electric line High pres- placed above the surface of the ground, or in any subway lines not in the sole occupation of the company, shall be com- ground of pletely enclosed either in a tube of highly insulating in subways. material embedded in brickwork, masonry, or cement concrete, or in strong metal casing efficiently connected with earth.
surface of
20. Where any high pressure electric line is laid Protection beneath the surface of the ground, efficient means shall for the be taken to render it impossible that the surface of the the ground ground or any neighbouring electric line or conductor and elec shall become charged by leakage from the high pressure electric line.
tric lines.
21. A high pressure electric line shall not, except with Completion the consent of the Director of Public Works, be used for and control
of high pres the supply of energy before it has been completely laid, sure lines. 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.
Sub-stations and Street Boxes.
22. Sub-stations shall be established in suitable places Sub-stations. and shall be in the sole occupation and charge of the company. Sub-stations shall be crected above ground wherever possible, but where necessarily underground, due provision shall be made for ventilation and for drainage.
23. In addition to the provisions contained in regula- Street boxes, tion 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 immie- diately 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 form- ing 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 capa- city, ample provision 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
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