Oct. 3.] THE NEW ZEALAND GAZETTE. 2833

out the entire length of every crossing-span with not less than 300-megohms-per-mile grade of vulcanized rubber, except that where it may be impracticable or undesirable to so insulate the electric-light wires over spans at such crossing-places the insulation of the electric-light wires may be triple weather-proof; provided that all other aerial wires referred to are insulated at those crossing-spans with not less than 300-megohms-per-mile grade of vulcanized rubber, or are otherwise satisfactorily insulated. In cases where telegraph or other aerial wires already exist and are required to be insulated, their insulation shall be effected at the Corporation’s expense, and shall be to the satisfaction of the Minister of Telegraphs.

6. Every support for an aerial line shall be of durable material and properly strengthened against forces due to wind-pressure, change of direction of the line, and unequal length of span. The factor of safety of such supports, taking into consideration all possible stresses, including wind-pressure at 30 lb. per square foot on plane surfaces and 18 lb. per square foot of diametrical plane for cylindrical surfaces, shall be at least 4 if those supports are of iron, steel, or ferro-concrete, and at least six if the supports are of wood.

The stress in the aerial conductors shall not exceed 28,000 lb. per square inch for copper and 15,000 lb. per square inch for aluminium in the extreme case of a temperature of 12° Fahr., and a wind-pressure of 18 lb. per square foot of diametrical plane occurring simultaneously.

7. Where lead-covered telephone cables are crossed above by the electric-light wires, the latter wires shall be insulated with not less than 300-megohms-per-mile grade of vulcanized rubber throughout the crossing-span, and over every such span they shall be suitably suspended from effectively earthed steel bearer-wires if the Minister of Telegraphs shall so require.

8. Where lead-covered telephone cables may be crossed under by the electric-light wires, if the height and other circumstances permit—and of this the Minister shall be the judge—the latter wires shall be insulated as in clause 7, and suspended if deemed necessary.

9. In places where it may be required to cross with the electric-light wires through any other aerial wires or through cables because of the impracticability of crossing above or below—and crossing above or below shall be done if possible—all such through crossings, if permitted by the Minister, shall be effected at a pole. In every case of a through crossing, no matter whose property the lines crossed through may be, the method of carrying the electric-light wires across the pole, protecting them thereon, protecting other wires from coming into contact with them, and protecting persons working on the poles form danger of shock shall be to the satisfaction of the Minister. The electric-light wires shall be insulated with not less than 300-megohms-per-mile grade of vulcanized rubber where they pass through on the poles and over the whole length of the span on each side of the pole crossed through. Where the insulated wires cross through on the pole they shall be encased in some hard protecting substance for the entire length of the arms on such pole. If metal pipe be used to encase the wires it shall be effectively earthed.

10. Efficient guard-wires shall be erected in a manner to meet with the approval of the Minister of Telegraphs at all crossings and places where electric-light wires intersect telegraph or other wires, as may be required by the Minister of Telegraphs to be so protected. The Corporation shall bear the expense of such guard-wires in all cases where an electric-light wire intersects a telegraph or other wire previously existing.

11. No work of any nature shall be erected or constructed in pursuance of this license upon, over, or under any part of the New Zealand Government railways until the said Council has obtained the consent of the Minister of Railways thereto, as required by section 4 of the Government Railways Amendment Act, 1910 (No. 2).

12. In running these lines through streets where no telegraph lines exist, the Corporation shall keep to one side of the street; and in running service wires to the opposite side of the street to that on which their line of poles is placed the Corporation shall arrange to supply so as to interfere as little as possible with the route on that side of the street.

13. Except by permission of the Minister, all overhead electric-light pole lines shall be placed on the opposite side of the streets to that on which any telegraph pole lines exist, and where the erection of the electric-light wires necessitates the alteration of telegraph-wires that may exist when the electric-light wires are being run, and such alteration is practicable, the expense of the alteration shall be borne by the Corporation.

14. Where the electric-light wires are on one side of a street and the telegraph wires are on the other, and service is required to be given from each to the other side of the street, each party shall give the other reasonable facilities as far as possible to effect supply.

15. Where it cannot be arranged otherwise, and there is room on the telegraph poles, and other circumstances do not render it unsafe or impracticable, the electric-light wires may be run along on the telegraph poles, subject to their insulation being not less than 300-megohms-per-mile grade of vulcanized rubber, and to any special conditions that it may be found necessary to impose at the time that the placing of such electric-light wires on the telegraph poles is being considered.

16. When the electric-light pole lines are being laid out provision should be made, by increased length of pole, to provide clearance to facilitate crossing with telegraph service wires to the side of the street occupied by the Corporation’s line.

17. Telegraph wires shall not be run along or placed on the Corporation’s poles, nor shall the Corporation’s wires be run along or placed on telegraph poles, without a special understanding of requirements and precautions to be observed being arrived at between a responsible officer of the Corporation and of the Minister in respect of each case. Rental at a rate to be agreed upon may be charged for the use of poles, but nothing in these regulations shall be construed to give any party a right to the use of poles other than its own.

18. 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 500 volts, and the Corporation shall duly record the results of the tests of each main or section of a main.

19. The insulation of every complete aerial and underground 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. 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 tests. Provided that where the Board of Control have approved of any part of any electrical circuit being connected with earth the provisions of this regulation shall not apply to that circuit so long as the connection with earth exists.

20. The sectional area of the conductor in any electric line laid or erected in any street shall not be less than that of a strand of seven wires, each of which is of No. 20 standard wire gauge, and the sectional area of every wire in a strand forming any such conductor shall not be less than that gauge.

21. 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 is wholly or partly metallic it shall be efficiently connected with earth.

22. All metal pipes or coverings containing any electric wire shall be efficiently connected with earth, and shall be so jointed as to make good electrical connection throughout their whole length.

23. Arc lamps used in any street for public lighting shall be so fixed as not to be in any part at a less height than 10 ft. from the ground. All arc lamps shall be so guarded as to prevent pieces of ignited carbon or broken glass falling from them, and shall not be used in situations where there is any danger of the presence of explosive dust or gas.

24. The variation of pressure at any consumer’s terminals shall not, under any conditions of the supply which the consumer is entitled to receive, exceed 4 per cent. above or below the normal pressure at which he is being supplied.

25. All aerial wires shall be attached to suitable insulators carried on cross-arms of suitable material and cross-section, and they shall be so attached to the insulators or guarded that they cannot fall away from the support. Conductors covered with insulating material shall be so attached that their insulation will not be impaired where they are secured to the insulator.

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

27. 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 any other special appliance. Every portion of any service