Hong Kong Regulations

ELECTRICITY SUPPLY REGULATIONS - REGULATION 23

Street boxes

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 1 cubic yard in capacity, 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 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.