1400
THE NEW ZEALAND GAZETTE.
[No. 38

License authorizing the Te Aroha Borough Council to erect Electric Lines within the Borough of Te Aroha, and in Portions of the Piako and Ohinemuri Counties.

ISLINGTON, Governor.
ORDER IN COUNCIL.

At the Government Buildings, at Wellington, this fifteenth day of April, 1912.

Present:
The Honourable T. Mackenzie, F.R.G.S., presiding in Council.

WHEREAS by section two of the Public Works Amendment Act, 1911, it is provided that no person shall lay, construct, put up, place, or use any electric line except under the authority of a license issued by the Governor in Council under that Act: And whereas the Te Aroha Borough Council (hereinafter referred to as “the said Council”) desires to erect electric lines within the Borough of Te Aroha, and in portions of the Piako and Ohinemuri Counties, and it is expedient accordingly to issue a license in respect thereof under the said section:

Now, therefore, in pursuance and exercise of the powers conferred upon him by the said section, and of all other powers enabling him in that behalf, His Excellency the Governor of the Dominion of New Zealand, acting by and with the advice and consent of the Executive Council of the said Dominion, doth, subject to the conditions set forth in the Schedule hereto, hereby authorize the said Council to erect and maintain electric lines for lighting and power purposes within the Borough of Te Aroha, and in portions of the Piako and Ohinemuri Counties, as indicated by purple, green, red, black, and yellow lines on the plans marked P.W.D. 30836, 30837, and 30838, deposited in the office of the Minister of Public Works, at Wellington, in the Wellington Provincial District.

SCHEDULE.
CONDITIONS.

In this license the following words and phrases shall have the meanings hereby attached to them respectively:—
(a.) “Minister” means the Minister of Public Works.
(b.) “Inspecting Engineer” means the engineer or other officer appointed by the Minister for the purpose of inspecting the works to be constructed or maintained by the Council under the authority of this license.

1. Three-phase alternating current shall be used in the transmission of electrical energy between the generating-station and the transformer sub-stations and in its distribution within the area of supply.

2. Current shall be generated at the power-station for delivery to transmission-wires at a frequency of 50 cycles per second, and at a pressure not exceeding 3,300 volts.

3. At the generating-station a properly equipped non-inflammable switchboard mounted upon a substantial iron frame shall be provided. All conductors must be so guarded that no unauthorized person can under any circumstances come in contact therewith.

4. The transmission-wires from the transformer-stations at Te Aroha to the outskirts of the town shall consist of either solid hard-drawn No. 8 copper wire, or of stranded cable equivalent in area to No. 8 standard wire gauge, insulated throughout their entire length with vulcanized indiarubber. The other portion of the transmission-wires may be bare, and if bare shall consist of hard-drawn copper wire of not less than No. 8 standard wire gauge.

5. Throughout the whole route the transmission-wires shall be attached to triple-shed highly vitrified porcelain insulators, and shall be spaced at least 2 ft. apart.

6. Along the transmission route a wire or wires of hard-drawn copper not smaller than No. 12 standard wire gauge may be run for service-telephone purposes. These wires must be insulated with vulcanized indiarubber from transformer-station at Te Aroha to the outskirts of the borough, but over the remainder of the route the wires may be bare. This wire shall be bound throughout to double-shed porcelain insulators.

7. At the generating and transformer stations the transmission-wires shall be securely and safely led in; and protection against lightning shall be provided on both wires at each end of the line. The telephone wire or wires shall be suitably guarded against lightning, shall be fused, and such arrangements shall be made where the telephone is placed as will prevent the possibility of injury resulting to any person using the telephone should a power-wire come into contact with the telephone-wire.

8. Where conductors cross telegraph or telephone lines they shall be insulated and protected to the satisfaction of the Minister of Telegraphs.

9. The transmission-line shall be on the opposite side of the road or street to that on which the telegraph and telephone lines are run. It shall be patrolled throughout its whole length at least once a week, and its insulation shall be so maintained that the maximum leakage shall not exceed one-thousandth part of the maximum supply-current. Suitable means shall be provided for indicating leakage on the line. Every leakage shall be remedied without delay. Tests shall be made weekly and recorded by the said Council.

10. Transformers shall have easily removable fuses for the primary circuit, and shall, as far as possible, be installed in enclosures accessible only to the officers of the said Council. Transformers for use outside shall be fitted with watertight cast-iron cases, and shall be affixed to poles so as to be inaccessible except by the use of a ladder or other special appliance. Every transformer shall have its iron case effectively connected with earth.

11. Conductors used for making the lightning-guard and transformer-case earth connections shall be of copper, and shall have an area of at least 0·023 square inches. They shall be properly stapled to the wooden poles, and shall be protected by a batten for a distance of 8 ft. from the ground. They shall be run as straight as possible, and be properly connected to an earth-plate. A test shall be made every three months, and oftener if required, of all earths, to secure that the earth-wire is intact and that the earth is effective.

12. The low-tension distribution shall be on the three-phase four-wire system, one-phase wire and the neutral being used for a single-phase system. The neutral point of the secondary windings of all distribution transformers shall be effectively earthed. The distribution voltages shall be 380 volts between phase wires and 220 volts from any phase wire to the earthed neutral. The supply to private consumers for lighting purposes shall be at 220 volts. Where cables are led to and from transformer-chambers they shall be protected on the poles by being run in iron pipes, which shall be effectively earthed. The low-tension wires may be bare, and shall consist of hard-drawn copper, and shall be placed, where they run on roads or streets, on the opposite side of the roads or streets where any telegraph or telephone line exists at the time of their erection, unless otherwise permitted by the Minister of Telegraphs. If there are no telegraph-wires in the street the electric lines shall be erected, as far as possible, on one side of the street. Wherever low- and high-tension wires run on the same poles all the wires shall be rubber-insulated.

13. Where the erection of the electric lines or wires necessitates the alteration of existing telegraph or telephone lines or wires, the expense of such alteration shall be borne by the said Council.

14. The sectional area of the conductor in any electric line for distribution purposes laid or erected in any street shall not be less than 0·012 square inches.

15. 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 where necessary 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.

16. 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.

17. Every support for an aerial line shall be of durable material, and properly strengthened against forces due to wind-pressure, change of direction of line, and unequal length of span. The factor of safety of such supports shall be at least four, 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. 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° F., and a wind-pressure of 18 lb. per square foot of diametrical plane occurring simultaneously.

18. The low-tension wires shall be attached to double-shed porcelain 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.

19. Any aerial wire used either for high-tension transmission, for low-tension distribution, or for telephone service shall not in any part thereof be at a less height from the ground than 18 ft., or within 5 ft. measured horizontally or 7 ft. measured vertically from any building or erection other than a support for the line, except where brought into a building for the purposes of supply.