JULY 23.] THE NEW ZEALAND GAZETTE. 1633

District, and Blocks II., III., IV., VI., VII., VIII., X., XI., XIII., and XIV., Waiau Survey District, and being the land contained in certificates of title A 15/169, A 12/14, 199/101, and parts of 204/152 and A 21/66, Canterbury Land Registry Office, and bounded as follows—towards the north-west and north-east by the Sherwood freehold, Mason River, freehold of F. S. Northcote, and the Mount Steward Road; towards the east by the Mendip Hills and Parnassus Estates; towards the south by the Waiau River; and towards the west by the Town of Waiau: the land contained in certificate N 4/23 and N 4/246, Canterbury Deeds Registry Office, the Mason and Lottery Rivers, and the Lottery Bush sections: save and except therefrom the freehold of W. Rutherford, containing 61½ acres, adjoining the Lottery Bush sections; Sections 1, 2, 3, 4, 6, and 10 of the Wandle Bush sections; the freehold of H. Wharton, containing 60 acres, at the mouth of the Stanton River; and the Highfield Homestead Block, containing 600 acres: as the same is more particularly delineated on the plan marked S.G. 19291, deposited in the Head Office of the Department of Lands and Survey, at Wellington, in the Land District of Wellington, and bordered pink thereon.

T. Y. DUNCAN,
Minister of Lands.

City Corporation of Christchurch authorised to erect and lay down Electric Lines in the City of Christchurch.

IN exercise of the power and authority conferred upon me by “The Electric Lines Act, 1884,” I, Joseph George Ward, the Electric Telegraph Commissioner appointed under the said Act, do hereby authorise and license the Corporation of the Mayor, Councillors, and Citizens of the City of Christchurch (hereinafter referred to as “the Corporation”) to erect, construct, lay down, and maintain electric lines for lighting and power purposes through the several streets in the City of Christchurch which are shown on the plan (marked “B”) deposited in the office of the Superintendent of Electric Lines, and on which plan the electric lines are indicated by red lines, and which is signed by me as such Commissioner as aforesaid, subject to the following conditions, namely:—

1. The system for the supply of electrical energy shall be that known as the low-pressure, continuous-current, two- or three-wire system.

2. Continuous current shall be generated at a voltage not exceeding 250 volts when two wires are used, or 500 volts between the two outers of the system when three wires are used. The declared pressure at the consumer’s terminals shall be 220 and 440 volts. Incandescent lamps shall be supplied at a pressure of 220 volts.

3. All overhead conductors crossing telegraph or telephone wires shall be insulated throughout their entire length with a grade of rubber insulation of not less than 300 megohms per mile, and in other places with duplex waterproof compounded insulation.

4. The main switchboard shall be made of and be mounted upon material that is not inflammable.

5. The said electric-lighting lines and wires may be placed wholly underground or overhead, or partly underground and partly overhead. All overhead lines shall be placed on the opposite side of the streets where any telegraph or telephone lines exist at the time of their erection, except by permission from the Electric Telegraph Commissioner.

6. Where the erection of the electric-light line or wires necessitates the alteration of existing telegraph or telephone lines or wires, the expense of such alterations shall be borne by the above-named Corporation.

7. The maximum working-current in any conductor shall not be sufficient to raise the temperature of the conductor, or any part thereof, to such an extent as to materially alter the physical condition or specific resistance of the insulating covering, if any, or in any case to raise such temperature to a greater extent than 30° Fahr. The cross-sectioned area and conductivity at joints must be sufficient to avoid local heating, and the joints must be carefully made, using resin as a flux, and must be protected against corrosion. The sectional area of all conductors from any distribution block must be maintained throughout the circuit, and joints should be made only when branching off a circuit, and should be at least 8in. distant from a joint in a conductor of opposite polarity.

8. The sectional area of the conductor in any electric line laid or erected in any street shall not be less than the area of a circle of ⅛ in. diameter, and where the conductor is formed of a strand of wires each separate wire shall be at least as large as No. 20 standard wire gauge.

9. All material used for insulating electric lines or apparatus shall be of the best quality, and thoroughly durable and efficient, having regard to the conditions of its use. Suitable provision shall be made for the protection of the insulating material against injury or removal.

If the protection so provided be wholly or partly metallic it shall be efficiently connected with earth.

10. Any metallic body to be “efficiently connected with earth” shall be connected with the general mass of the earth in such manner as will insure at all times an immediate and safe discharge of electrical energy.

11. Every main shall be tested for insulation after having been placed in position and before it is used for the purposes of supply, the testing pressure being at least 220 volts, and the Corporation shall duly record the results of the tests of each main or section of a main.

12. The insulation of every complete circuit used for the supply of energy, including all machinery, apparatus, and devices forming part of or in connection with such circuit, shall be so maintained that the leakage-current shall not under any conditions exceed one-thousandth part of the maximum supply-current; and suitable means shall be provided for the immediate indication and localisation of leakage. Every leakage shall be remedied without delay. Every such circuit shall be tested for insulation at least once in every week, and the Corporation shall duly record the results of the testings:

Provided that where the Electric Telegraph Commissioner has approved of any part of any electric circuit being connected with earth the provisions of this section shall not apply to that circuit so long as the connection with earth exists.

13. Where any portion of any electric line or any support for an electric line is exposed in such a position as to be liable to injury from lightning it shall be efficiently protected against such injury.

14. Every aerial line shall be attached to supports at intervals not exceeding 200ft. where the direction of the line is straight, or 150ft. where the direction is curved or where the line makes a horizontal angle at the point of support.

15. Every support for an aerial line shall be of a durable material, and properly stayed against forces due to wind-pressure, change of direction of the line, or unequal lengths of span. The factor of safety shall be for aerial lines and suspending wires at least 6, and for all other parts of the structure at least 12, taking the maximum possible wind-pressure at 50lb. per square foot. No addition need be made for a possible accumulation of snow.

Every support, if of metal, and all iron pillars shall be efficiently connected with earth.

16. All aerial lines shall be attached to porcelain insulators, and shall be so guarded that they cannot fall away from the support. Conductors covered with insulating material shall not be attached to the insulators by uninsulated metal binders.

17. Any aerial line or wire shall not in any part thereof be at a less height from the ground than 18ft., or within 5ft. measured horizontally or 7ft. measured vertically from any building or erection other than a support for the line, except where brought into a building for the purpose of supply.

18. Service lines from aerial lines shall be led as directly as possible to insulators firmly attached to some portion of the consumer’s premises which is not accessible to any person without the use of a ladder or other special appliance. Every portion of any service line which is outside a building but is within 7ft. from the building shall be completely enclosed in stout indiarubber tubing.

19. Where an aerial line crosses a street the angle between the line and the direction of the street at the place of crossing shall not be less than 60°, and the spans shall be as short as possible.

20. Where an aerial line crosses or is in proximity to any metallic substance, precautions shall be taken against the possibility of the line coming into contact with the metallic substance, or of the metallic substance coming into contact with the line, by breakage or otherwise.

21. Efficient guard-wires shall be erected in a manner to meet with the approval of the Electric Telegraph Commissioner at all crossings and places where aerial electric-lighting wires intersect telegraph or telephone wires as may be required by the Commissioner to be so protected. The Corporation shall bear the expense of such guard-wires in all cases where an aerial electric-lighting wire intersects a telegraph or telephone wire previously existing.

22. Every aerial line, including its supports and all the structural parts and electrical appliances and devices belonging to or connected with the line, shall be duly and efficiently supervised and maintained as regards both electrical and mechanical conditions.

23. An aerial line shall not be permitted to remain erected after it has ceased to be used for the supply of energy, unless the Corporation intend within a reasonable time again to take it into use.

24. Where the electric lines are run in cables laid underground, the cables may be placed in conduits, metal pipes, or solid in wood troughing, and all such receptacles shall be constructed of durable materials, which shall be of sufficient