P
T
THE HONGKONG GOVERNMENT GAZETTE, MARCH 16, 1917.
(4) switches, efficient fuses or other automatic circuit-breakers shall be provided, so as to protect the circuits from excess of current, and all switches and cut-outs shall be so enclosed and protected that there shall be no danger of any shock being obtained in the ordinary handling thereof, or of any fire being caused by their normal or abnormal action;
(5) a notice shall be fixed in a conspicuous position at every motor and switch board in connection with the supply forbidding unauthorised persons to touch the motors or apparatus.
(b) Where the supply is for are lamps in series,—
(1) the consumer's wires forming the connections to the arc lamps, or otherwise in connection with the supply, shall be, as far as practicable, completely enclosed in strong metal casing efficiently connected with earth, or they shall be fixed in such a manner that there shall be no danger of any shock;
(2) the supply to every arc lamp shall be controlled by means of an efficient cut-off switch, placed in such a position as to be easily handled by the person in charge of the are lighting, and connected so that by its means all pressure can be cut off from the arc lamp itself, and from any regulating switch, resistance or other device in connection there- with. Provided that where the are lamps are connected in series across the outer conductors of a three-wire system, it shall be sufficient if one such switch be provided for each series of arc lamps;
(3) switches, efficient fuses or other automatic cut-outs shall be provided, so as to protect the circuits from excess of current, and all switches and cut-outs shall be so enclosed and protected that there shall be no danger of any shock being obtained in the ordinary handling thereof, or of any fire being caused by their normal or abnormal action.
(c) Where the supply is for incandescent lamps in series, unless the Director of Public Works otherwise allows,-
(1) the consumer's wires forming the connections to the incandescent lamps, or otherwise in connection with the supply, shall be completely enclosed in strong metal casing, and this casing together with the switches and lamp holders, if metallic, shall be efficiently connected with earth;
(2) switches, efficient fuses or other automatic cut outs shall be provided, so as to protect the circuits from excess of current, and all switches and cut-outs shall be so enclosed and protected that there shall be no danger of any shock being obtained in the ordinary handling thereof, or of any fire being caused by their normal action.
Where the supply is for any special purpose other than those above- mentioned, or where the pressure of the supply exceeds the limits of medium pressure it shall be subject to such other regulations as the Governor in Council may prescribe.
3. When the pressure between the outer conductors of a three-wire Introduc- system exceeds 250 volts and the three wires of the system or two pairs tion of
three-wire. of wires are brought into a consumer's premises, the supply shall be
system into given to two pairs of terminals arranged in such a manner that there consumers' shall be no danger of any shock, and the wiring from those terminals premises. shall be kept distinct.
4. The sectional area of the conductor in any electric line other than Minimum low tension laid or erected in any street after the date of these Regula- size of tions shall not be less than that of a strand of 7 wires, each of which conductors. is of No. 22 standard wire gauge, and the sectional area of every wire in a strand forming any such conductor shall not be less than that gauge, and where such stranded conductor is erected it shall be suspended from a suitable bearer wire or shall be protected by a suitable cradle fixed underneath. In the case of low tension conductors in any electric line the sectional area shall not be less than that of a single wire of No. 16 standard wire gauge efficiently insulated.
This regulation shall not apply in the case of an electric line placed in a lamp-post.
pressure and
5. Every low pressure and medium pressure main, after having been Insulation placed in position, and before it is used for the purposes of supply, shall test of low withstand a pressure equal to the maximum pressure to which it is medium intended to be subjected in use, and in any case at least 200 volts, and pressure further, before being used as aforesaid, it shall be tested for insulation, mains. and the company shall duly record the results of the tests of each main or section of a main.'
107.