570
THE NEW ZEALAND GAZETTE.
No. 16

iron pipe and brackets shall be efficiently earthed. The cost of insulating the telegraph and telephone wires shall be borne by the Corporation.

37. 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 either transmission or distribution 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 electric-lighting wire intersects a telegraph or telephone wire previously existing.

38. Every aerial line, including its supports, its conductors, and their insulating covering, 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.

39. 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.

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

41. The Corporation shall be responsible for all electric lines, fittings, and apparatus belonging to them, or under their control, which may be upon a consumer’s premises being maintained in a safe condition and in all respects fit for supplying energy.

42. In delivering the energy to a consumer’s terminals the Corporation shall exercise all due precautions so as to avoid risk of causing fire on the premises.

43. All electric lines and apparatus placed on a consumer’s premises, excepting such parts as are required to be connected with earth, shall be highly insulated, and be suitable for the voltage at which supply is being given. They shall be thoroughly protected against injury to the insulation or access of moisture, and any metal forming part of the electric current shall not, unless efficiently connected with earth, be exposed so that it can be touched. All electric lines shall be so fixed and protected as to prevent the possibility of electrical discharge to any adjacent metallic substance.

44. The Corporation shall fix where their service mains for supply at 220 volts terminate on any premises single-pole well-protected fuses on each conductor of at least 2 in. clear break. They shall also fix double-pole main switches of ample carrying-capacity, well insulated, with quick break of sufficient clearance to prevent arcing. When the premises are wired for a consumption of 5 kilowatts or over, a distance of at least 4 in. shall separate the terminals of the break switches.

45. All wiring shall be done from distributing-boards, which shall be of incombustible material. Suitable fuses on each conductor, 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 switches are not provided. If double-pole switches are provided the fuses need not be of the spring-clip type.

46. The covers of fuses, switches, and plugs shall 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. Where switchboards are accessible only to some responsible person, separate insulated covers for the parts mounted thereon will not be required.

47. 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 incandescent lamps shall be controlled by each switch.

48. The conductors used for the wiring for lighting or heating purposes shall be covered with not less than 600 megohms per mile grade of vulcanised rubber insulation 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.

49. 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.

50. 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.

51. 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.

52. 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. They may be supplied with current from any two outer wires of the supply system. The insulation-resistance of the conductors supplying them with current when such conductors are not aerially suspended shall not be less when the current is taken from two outer wires than 600 megohms per mile after one minute’s electrification and twenty-four hours’ immersion in water immediately preceding the test. These insulated conductors shall be run in strong metal casing, which shall be electrically continuous and effectively connected with earth. Resistances for the regulation of arc lamps, if exterior to the lamp, 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 normally flow through them. Each arc-lamp circuit shall be provided with a switch and a fuse on each conductor.

53. Motors shall be either of the enclosed or semi-enclosed type, and shall be efficiently ventilated. Motors up to 3½-horse power may be supplied with current at 220 volts, due regard being had to avoidance of disturbance to lighting.

54. The frame and shaft of all motors shall be connected to an efficient earth by a copper conductor, which shall be equal to the area of one of the conductors leading to the motor, but need not exceed 7/16 gauge. All metal casings of switches, resistances, fuses, cables, and wires shall be efficiently earthed in a similar manner.

55. Every such motor must be controlled by an efficient double- or triple-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.

56. Efficient single-pole fuses must be provided to efficiently protect the conductors from excess of current, and where these are used to guard conductors taken off the three outer wires of the supply system they shall have a clear break of 3 in.

57. Every precaution shall be taken in choosing positions for and in the wiring and setting-up of 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 obtained in the ordinary handling thereof.

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

59. Motors exceeding 3½-horse power must be supplied with current taken from the three outer wires, and a distinct circuit must be run for them. The conductors of all motors must have an insulation-resistance of not less than 600 megohms per mile.

60. The conductors of all motors supplied from the outer wires shall be enclosed in strong metal covering electrically continuous throughout its entire length, and effectively connected to earth, and provision shall be made to prevent the accumulation in the metal pipe of any moisture due to condensation.

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

62. 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 that part of any lighting or motor circuit to which alterations may be required.

63. The Corporation shall not connect the wires and fittings on a consumer’s premises with their mains, or, in the case of premises already connected, continue the supply from their mains, unless they are 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 decline to make such connection or to continue supply they shall serve upon the consumer a notice stating their reasons for so declining.

64. If the Corporation are 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 them in writing, or, if the Corporation so require, on application by them to the