APRIL 25.] THE NEW ZEALAND GAZETTE. 1401

20. 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 7 ft. from any part of the building shall be rubber-insulated.

21. Where an aerial wire crosses a street, its height above the road-surface shall be at least 20 ft., and 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.

22. 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 by breakage or otherwise.

23. Where telegraph or telephone wires are crossed either over or under by the low-pressure electric-light wires, there shall be a distance of at least 2 ft. between the telephone and the electric-light wires, and the former shall, if deemed necessary, be insulated throughout the whole length of the span intersected, and when the crossing is near a telegraph or telephone pole the spans on each side of the pole shall be insulated by the said Council if so required by the Minister of Telegraphs. The low-pressure wires shall, where deemed necessary, be rubber-insulated at such crossings either over the whole span or over such portion of it as will insure that uninsulated portions of the telegraph or telephone and of the low-tension electric-light wires will not come into contact with each other. In cases where it may be deemed not necessary to insulate both classes of wires, either the telegraph and telephone or the electric-light wires shall be insulated as may be considered most suitable. Where low-tension distribution-wires cross telegraph or telephone wires the former shall be affixed to porcelain insulators mounted on iron brackets suitably attached to the arms on each side of the line so crossed, and shall then be taken through bell-mouthed iron pipes secured to the arms. The iron pipe and brackets shall be efficiently earthed. The low-pressure wires shall be insulated with vulcanized rubber of 600-megohms-per-mile grade, and the insulation shall extend as is indicated in the preceding part of this clause. This class of insulation shall apply to the low-tension distribution-wires wherever it may be found necessary to cover them with an insulating material. The cost of insulating the telegraph and telephone wires shall be borne by the said Council.

24. If the Minister of Telegraphs so requires, efficient guard-wires shall be erected in a manner to meet with the approval of the said Minister at all crossings and places where either transmission or distribution electric-lighting wires intersect telegraph or telephone wires. The Council shall bear the expense of such guard-wires in all cases where an electric-lighting wire intersects a telegraph or telephone wire previously existing.

25. 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.

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

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

28. The said Council shall be responsible for all electric lines, fittings, and apparatus belonging to it, or under its control, which may be upon a consumer’s premises, being maintained in a safe condition and in all respects fit for supplying energy.

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

30. 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-sectional area and conductivity at joints must be sufficient to avoid local heating, and the joints must be carefully made, resin being used as a flux, and must be protected against corrosion. The sectional area of all conductors on the consumer’s premises from the main switchboard or from any distribution-board must be maintained throughout the circuit, and joints should be made only when branching off a circuit, and should be at least 8 in. distant from a joint in any other conductor.

31. All electric lines and apparatus on a consumer’s premises, excepting such parts as are required to be connected to 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 circuit 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.

32. The said Council shall fix, where their service mains terminate on any premises, double-pole well-protected fuses of at least 2 in. clear break. The consumer shall also place, in an accessible position, as near to the entrance-fuses as may be practicable, double-pole main switches of ample carrying-capacity, well insulated, with quick break of sufficient clearance to prevent arcing.

33. The 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 an approved 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 should be provided with non-conducting covers. Not more than 3 amperes shall be controlled by each subswitch.

36. The insulation of conductors used for interior wiring shall be of vulcanized rubber of not less than 600-megohms-per-mile grade, or of other approved material suitably protected. All interior conductors carrying current to apparatus at 380 volts shall be run in strong metal casing.

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 be fixed so that they cannot swing into contact with any substance, metallic or otherwise, that might connect them to earth. They may be run in series, and at any available voltage up to 380 volts.

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 fuse on each pole. Interior arc lamps shall also be provided with a switch on each circuit.

41. The frame of all motors supplied at 220 or 380 volts shall be connected to an efficient earth by a copper conductor, which shall have an area of not less than 0·023 square inches. All metal casings of switches, resistances, fuses, cables, and wires shall be efficiently earthed in a similar manner.

42. Every motor must be controlled by an efficient 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.

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

44. 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 sustained in the ordinary handling thereof.

45. Terminals of motors supplied at 220 or 380 volts must be so guarded that they cannot be accidentally touched or short-circuited.

46. 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.