Nov. 9.] THE NEW ZEALAND GAZETTE. 3343

issue thereof have the same effect as though they had been originally inserted in the Waipori Falls Electrical Power Act, 1904: And whereas by section one hundred and seventy-three of the Post and Telegraph Act, 1908, the Governor is empowered to make regulations by Order in Council gazetted for the use, management, and control of any works used for electric-lighting purposes and the conduct of persons employed in such works, and for securing the safety of the public from personal injury, or from fire, or otherwise, by reason of the exercise of any of the powers contained in Part XII of the Post and Telegraph Act, 1908:

Now, therefore, His Excellency the Governor of the Dominion of New Zealand, in pursuance and exercise of the powers and authorities conferred on him by the above-named Acts, and acting by and with the advice and consent of the Executive Council of the said Dominion, doth hereby make the regulations set forth in the Schedule hereto for the purposes hereinbefore mentioned.

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SCHEDULE.

REGULATIONS.

Interpretation.

In these regulations, if not inconsistent with the context,—

“Corporation” means the Corporation of the Mayor, Councillors, and Citizens of the City of Dunedin.

“Consumer’s wires” means any electric lines on a consumer’s premises which are connected at the consumer’s terminals with the service-lines of the Dunedin Corporation anywhere within the area of supply.

“Overhead line” means any electric line which is placed above ground and in the open air.

“Pressure” means the difference of electrical potential between any two conductors, or between a conductor and earth. This potential shall be considered to be root-mean-square value of the voltage.

“Low pressure” means a pressure in a system normally not exceeding 250 volts where the electrical energy is used.

“Medium pressure” means a pressure in a system normally above 250 volts, but not exceeding 650 volts, where the electrical energy is used.

“High pressure” means a pressure in a system normally above 650 volts, but not exceeding 3,000 volts, where the electrical energy is used or supplied. In no case during normal conditions of supply shall the voltage in any other part of the circuit exceed by more than 10 per cent. that at the point of supply.

“Extra-high pressure” means a pressure in a system exceeding “high pressure” as defined in the preceding paragraph.

“System” means an electrical system in which all the conductors and apparatus are metallically electrically connected to a common source of electro-motive force.

“Conductor” means an electrical conductor arranged to be connected to a system.

“Apparatus” means electrical apparatus, and includes all apparatus, machines, and fittings in which conductors are used and of which they form a part.

“Circuit” means an electrical circuit forming a system or branch of a system of one, two, three, or four wires.

“Switchboard” means the collection of switches or fuses, conductors, and other apparatus in connection therewith used for the purpose of controlling the current or pressure in any system or part of a system.

“Danger” means danger to health or to life or limb from shock, harm, or other injury to persons, or from fire attendant upon the generation, transmission, transformation, distribution, or use of electrical energy.

“Earthed” means connected to the general mass of earth in such manner as will insure at all times an immediate discharge of electrical energy without danger.

“Substation” means a place accessible only to authorized persons where the extra-high pressure from the Waipori transmission-lines are led so that the pressure may be transformed to lower pressures for distribution.

“Telegraph” includes telephone.

1. Three-phase current generated at 2,400 volts 50 cycles at Waipori shall be transformed to 35,000 volts star connected for transmission to Half-way Bush, near Dunedin, and to substations en route, or wherever they may be necessary within the area of supply.

2. The generating-station at Waipori and the substations shall be suitably laid out, equipped, maintained, and controlled so as to satisfactorily meet the purposes for which they are designed.

3. At the generating-station and the substations the neutral point of the star winding of the transformer-coils connected to the extra-high-tension transmission-lines shall be properly earthed. This requirement shall also apply to the neutral point of one or more of the generators supply-

ing power to the extra-high-pressure transformers at the generating-station.

4. As supports for the two transmission-lines from Waipori to Half-way Bush, and for any other main or branch lines within the area of supply that may be erected, wooden poles of approved timber, preferably hardwood, may be used. They shall be generally not less than 35 ft. in length, and spaced at intervals not in excess of 150 ft. Where the configuration of the surface does not permit of this spacing, longer intervals may be employed. Iron towers may be used instead of wooden poles. Where wooden poles are used at road-crossings they shall be, say, 45 ft. long, and shall be fitted with double cross-arms and insulators. The length of span shall be reduced where practicable, and where deemed necessary wire cradles effectively earthed or other suitable means shall be provided to safeguard road-crossings.

5. An arrangement shall be come to with the Railway Department in respect of all railway-crossings as to clearance of wires above the railway-line, length of span, and the nature of the support on each side of the crossing, and any special protection over the crossing that may be required.

6. Before any branch lines as extensions of the 35,000-volt transmission system from Waipori to Half-way Bush, or other extra-high-pressure lines that may be required to be run from the generating-station, are begun, special application shall be made to the Board of Control, giving full particulars of them and the plan of the proposed route.

7. The wires shall be of hard-drawn copper, of suitable gauge for the transmission of the requisite current and for securing the necessary mechanical strength. They shall be securely attached to high-voltage insulators affixed by iron pins to cross-arms of hardwood or other suitable material of the requisite length and cross-section. The wires shall be so attached that they cannot chafe through at the insulators. They shall be run in the form of an equilateral triangle, the length of each side being not less than 3 ft. 6 in. Only one such circuit shall be run on one line of poles, unless special permission be obtained. Where towers are used as supports, two transmission circuits may be attached to them.

8. Along any line of transmission-poles a metallic telephone circuit of bare hard-drawn copper wire of not less than No. 12 standard wire gauge may be run. These wires shall be about 7 ft. below the lowest transmission-wires, and shall not be less than 18 ft. above the ground at their lowest point at maximum temperature. At road-crossings they shall be as much higher as the increased length of pole will permit. These wires shall be attached to suitable insulators affixed to brackets or cross-arms. At intervals along the routes and at each terminus provision shall be made by insulated platforms, fuses, and earthing-devices that persons using the telephone at these points shall be safeguarded against injury should a power wire come into contact with the telephone circuit.

9. All extra-high-pressure transmission-lines, including branches, shall be patrolled at least tri-weekly, and all trees in their vicinity shall be kept well cut back.

10. A factor of safety of at least 6 shall be observed in respect of poles, arms, insulator-pins, wires, and all parts of the structure constituting the extra-high-pressure transmission-lines, and special care shall be taken to maintain this factor of safety unimpaired.

11. Transformation direct from the 35,000-volt mains shall not be permitted except at a properly equipped sub-station.

12. The extra-high pressure shall be transformed under normal conditions to not in excess of 3,300 volts between outers for overhead or underground transmission to the “converter station,” situated on Sections 13 and 14, Block XV, City of Dunedin, or for overhead or underground distribution to transformers in any part of the area of supply, or for supply direct to motors operating at high pressure.

Transformers.

13. High-pressure transformers may be installed on consumer’s premises provided that the whole of the high-pressure conductors, apparatus, and the transformer itself, as far as they are on the consumer’s premises, shall be enclosed in solid walls, or alternatively that the conductors be run in strong metal casing electrically continuous, and that such casing and the metal covers of transformers be efficiently connected with earth and securely fastened throughout. Any other apparatus shall be so arranged as to safeguard against danger, and shall be efficiently earthed when practicable.

14. Transformers may be placed underground in brick or concrete chambers, properly drained, or may be attached to poles or suitable brick or stone buildings so as to be inaccessible except by the use of a ladder or other special appliance. They may also be placed in corrugated-iron