2218
THE NEW ZEALAND GAZETTE.
No. 76

the transmission-lines at points as indicated in clause 13
shall be made once every three months and recorded.

34. Every low-tension aerial line shall be attached to
    supports at intervals not exceeding 200 ft. where the direc-
    tion of the line is straight, or 150 ft. where the direction is
    curved or where the line makes a horizontal angle at the
    point of support.

35. Every support for an aerial line shall be of a durable
    material, and properly stayed against forces due to wind-
    pressure, change of direction of the line, or unequal lengths
    of span. The factor of safety shall be for all aerial lines and
    suspending wires at least 6, and for all other parts of the
    structure at least 12, taking the maximum possible wind-
    pressure at 50 lb. per square foot.

Every support, if of metal, shall be efficiently connected
with earth.

36. All aerial lines shall be attached to porcelain insulators,
    and shall be so guarded that they cannot fall away from the
    support.

37. Any aerial line or wire for distribution purposes 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 purpose of supply.

38. 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 the building shall be completely
    enclosed in stout indiarubber tubing.

39. Where an aerial line crosses a street the angle between
    the line and the direction of the street at the place of cross-
    ing shall not be less than 60°, and the spans shall be as
    short as possible.

40. 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, or of the metallic substance coming into contact
    with the line, by breakage or otherwise.

41. Where telegraph or telephone wires are crossed either
    over or under by the low-pressure electric light and power
    wires, the former shall be insulated throughout the whole
    length of the span intersected, and when the crossing is
    near a pole the spans on each side of the pole shall be
    insulated if deemed necessary, in all cases at the expense of
    the company.

42. Efficient guard-wires shall be erected in a manner to
    meet with the approval of the Electric Telegraph Commis-
    sioner 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 company shall bear the expense of
    such guard-wires in all cases where an electric-lighting wire
    intersects a telegraph or telephone wire previously existing.

43. Every aerial line, including its supports and all the
    structural parts and electrical appliances and devices belong-
    ing to or connected with the line, shall be duly and efficiently
    supervised and maintained as regards both electrical and
    mechanical conditions.

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

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

46. The company shall be responsible for all electric lines,
    fitting, 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.

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

48. All electric lines and apparatus placed on a con-
    sumer’s premises shall be highly insulated, and be suitable
    for the voltage at which supply is being given, excepting
    such parts as are required to be connected with earth. 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 possi-
    bility of electrical discharge to any adjacent metallic sub-
    stance.

49. The company 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.

50. 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.

51. 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.

52. 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.

53. The conductors used for the wiring for lighting or
    heating purposes shall be of 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.

54. 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.

55. 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.

56. 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.

57. 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 con-
    ductors are not aerially suspended shall not be less when the
    current is taken from two outer wires than 2,500 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 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 fuse on each conductor.

58. Motors shall be either of the enclosed type or enclosed
    in strong metal cases, 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 disturb-
    ance to lighting.

59. 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. All metal casings of switches,
    resistances, fuses, cables, and wires shall be efficiently
    earthed in a similar manner.

60. 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.

61. Efficient single-pole fuses must be provided to ef-
    ficiently 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., and provision shall be made to extinguish the
    arc.

62. 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 abnor-
    mal action, or of shock being obtained in the ordinary hand-
    ling thereof.

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