2312
THE NEW ZEALAND GAZETTE.
[No. 79

protected as to prevent the possibility of electrical discharge to any adjacent metallic substance.

32. The Corporation shall fix, where their service mains for supply at 220 volts terminate on any premises, double-pole well-protected fuses of at least 2½ in. clear break. Double-pole main switches shall also be fixed, of ample carrying-capacity, well insulated, with quick break of sufficient clearance to prevent arcing.

33. All wiring shall be done from distributing-boards, which shall be of incombustible material. Suitable fuses on each pole fitted to engage in spring clips shall be placed on these boards, so that it shall be possible to disconnect any or all circuits from the supply. If double-pole switches be used on the distributing-board circuits, fuses need not then be of the type to engage in spring clips.

34. The covers of fuses, switches, and plugs should be of porcelain or other incombustible non-conducting material, or of rigid metal lined with vitreous enamel or suchlike substance. All metal parts liable to be touched must be effectively insulated from the electrical circuit.

35. There must be a porcelain bridge or other efficient insulation between the terminals of lamp-holders, and where lamp-holders are liable to be handled by persons making good earth contact they must be provided with non-conducting covers. Not more than ten sixteen-candle-power lamps, or their equivalent, shall be controlled by each switch.

36. The insulation-resistance of conductors used for interior wiring or lighting or heating purposes shall not be less than 600 megohms per mile after one minute’s electrification and twenty-four hours’ immersion in water immediately preceding the test. Concentric conductors may be used, and their insulation-resistance shall not be less than that required for separate conductors.

37. 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.

38. 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.

39. Arc lamps used in any street for private lighting shall be so fixed as not to be in any part at a less height than 8 ft. from the ground, and shall be so screened as to prevent risk of contact with persons.

40. Arc lamps must be insulated from earth, and fixed so that they cannot swing into contact with any substance, metallic or otherwise, that might connect them to earth. The mains to the arc lamps shall be run in strong metal casing, which shall be electrically continuous and effectively connected with earth. The insulation-resistance of the conductors run in metal casing shall be not less than 600 megohms per mile. Resistances for the regulation of arc lamps shall be mounted on incombustible bases, shall be so placed that they cannot by conduction or radiation set fire to any contiguous materials, and shall be of ample size to safely carry the maximum current that will flow through them. Each arc-lamp circuit shall be provided with a switch and fuse on each pole.

41. Motors shall be either of the enclosed type or enclosed in strong metal cases, and shall be efficiently ventilated.

42. The magnet, frame, and shaft of all motors shall be connected to an efficient earth by a copper conductor, capable of carrying without overheating twice the fusing-current of the main fuse, with a minimum section of 7–16 standard wire gauge. All metal casings of switches, resistances, fuses, cables, and wires shall be efficiently earthed in a similar manner.

43. An approved starting-device shall be used on all motors connected directly with the mains.

44. Three-phase and single-phase motors must be controlled respectively by an efficient triple-pole and double-pole quick-break switch suitable to prevent arcing, and conveniently placed so that the person in charge of the motor can cut off wholly the supply from the motor, and all devices in connection therewith.

45. Efficient single-pole fuses or other automatic cut-out must be provided to efficiently protect the conductors on each pole from excess of current.

46. Precaution shall be taken in choosing positions for and in the wiring and setting up motors, and the necessary devices in connection therewith, so that there shall be no danger of fire being caused by their normal or abnormal action, or of shock being sustained in the ordinary handling thereof.

47. Terminals of motors must be guarded so that they cannot be accidentally touched or short-circuited.

48. The insulation-resistance of each motor-circuit, including all devices necessary for the working of the motor, shall not be less than 1 megohm to earth when all metal parts that are required to be connected to earth are so connected.

49. Energy may be supplied to the Post and Telegraph Department from the 500-volt tramway direct-current supply to operate three small motors. The lead from the trolley wire or feeder, and the return to the rail, shall be insulated with not less than 600 megohms per mile grade of insulation. The line-lead shall be fused where it is tapped off the circuit for supply. Inside the building, as near to the point of entrance as possible, the line-lead shall be provided with a covered fuse, and both line and return shall be fitted with a double-pole switch. Suitable inlet-tubes shall be used where the wires pass through the outer walls. The return shall be properly bonded to the rail. The interior wiring shall be run in metal pipe, which shall be electrically continuous and effectively earthed.

50. A printed notice shall be fixed in a conspicuous position at every motor and switchboard forbidding unauthorised persons to touch the motors or apparatus, and no alterations shall be made during the time that current is on either pole of that part of any lighting or motor circuit to which alterations may be required.

51. The Corporation shall not connect the wires and fittings on a consumer’s premises with its mains, or, in the case of premises already connected, continue the supply from its mains, unless it is reasonably satisfied that the requirements of this license are complied with, that the wiring and fittings are suitable for the voltage at which supply is being given, and that the connection or continuance of supply would not cause a leakage from those wires and fittings exceeding one ten-thousandth part of the maximum supply-current to the premises; and where the Corporation declines to make such connection or to continue supply, it shall serve upon the consumer a notice stating its reason for so declining.

52. If the Corporation is reasonably satisfied, after making all proper examination by testing or otherwise, that the wiring and fittings are not suitable for the voltage being employed, that a leakage exists at some part of a circuit of such extent as to be a source of danger, and that such leakage does not exist at any part of the circuit belonging to the Corporation, or that any other requirements of this license are not complied with, then and in such case any officer of the Corporation duly authorised by it in writing, or, if the Corporation so require, on application by it to the Electric Telegraph Commissioner, any officer of the Post and Telegraph Department (hereinafter referred to as an “Electric Inspector”) instructed to so act, may, for the purpose of discovering whether the leakage exists at any part of a circuit within or upon any consumer’s premises, or whether the wiring is suitable and the general requirements of the license are complied with, by notice require the consumer, at some reasonable time after the service of the notice, to permit him to inspect and test the wires and fittings belonging to the consumer and forming part of the circuit.

In any case where the Corporation requires the services of an Electric Inspector under this section it shall pay the cost of such inspection.

If on such testing and inspection the officer or the Electric Inspector discovers a leakage from the consumer’s wires exceeding one ten-thousandth part of the maximum supply-current to the premises, or that the requirements of this license are not properly conformed to, or if the consumer does not give all due facilities for inspection and testing, the Corporation shall forthwith discontinue the supply of energy to the premises in question, giving immediate notice of the discontinuance to the consumer, and shall not recommend the supply until it is reasonably satisfied that the leakage has been removed, and that the installation is in conformity with this license.

53. If any consumer is dissatisfied with the action of the Corporation in refusing to give, or in discontinuing, or in not recommending, the supply of energy to his premises, the wires and fittings of that consumer may, on his application to the Electric Telegraph Commissioner, and on payment of the cost of such inspection, be inspected, and be tested for the existence of leakage by an Electric Inspector.

This provision shall be indorsed on every notice given under the provisions of either of the two last preceding sections.

54. From and after the time when the Corporation commences to supply energy through any distributing-main it shall maintain a supply of sufficient power for the use of all the consumers for the time being entitled to be supplied from such main, and such supply shall be constantly maintained: Provided that, for the purposes of testing, or for any other purposes connected with the efficient working of the undertaking, the Electric Telegraph Commissioner may give permission to the Corporation to discontinue the supply at such intervals of time and for such periods as he may think expedient. When the supply is so discontinued, public notice, as far as may be practicable, shall be given of such discontinuance, and of the probable duration thereof.

55. 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. from the normal pressure at which he is being supplied.

56. The Electric Telegraph Commissioner may at any time