550
THE NEW ZEALAND GAZETTE.
[No. 18

against the possibility of the line coming into contact with
the metallic substance by breakage or otherwise.

Supports for Overhead Lines.

26. All aerial wires shall be attached to suitable 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. Conductors covered
    with insulating material shall be so attached that their insu-
    lation shall not be impaired where they are secured to the
    insulator.

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 outside town limits shall be
such that the moment resulting from a wind-pressure of 30 lb.
per square foot on plane surfaces and 18 lb. per square foot of
diametral plane upon a cylindrical surface upon the lines and
supports shall not exceed one-half of the applied moment
which is sufficient to cripple the support if of iron, steel, or ferro-
concrete, and shall not exceed one-fourth of the breaking
stress in the case of wood. The factor of safety of supports
within the town limits shall be four in the case of steel, iron,
or ferro-concrete, and five in the case of wood, calculated
upon the ultimate strength of material under the same
conditions of wind-pressure as hereinbefore mentioned.

The distance between supports within town limits shall not
exceed 150 ft. except by approval of the Minister.

Location of Overhead Lines.

27. Except by permission of the Minister of Telegraphs, or
    subject to an agreement between the Post and Telegraph
    Department and the Board, all overhead electric lines shall
    be placed on the opposite side of the street to that on
    which any telegraph lines exist; and where the erection
    of the electric lines necessitates the alteration of any tele-
    graph lines, and such alteration is approved by the Minister
    of Telegraphs, the cost of the alteration shall be borne by
    the Board.

In running the lines authorized by this license through or
along any street where no telegraph line exists the Board
shall keep to one side of the street, and in running service
wires to the opposite side of the street the Board shall
arrange so as to interfere as little as possible with the route
of any future telegraph lines.

Lines not in Use.

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

Post and Telegraph.

29. Where electric lines are permitted to be supported on
    telegraph poles all details of the supports and the insulation
    shall be approved by the Minister of Telegraphs, who may, on
    giving to the Board reasonable notice in that behalf, require
    the Board to remove such electric lines at any time from
    such telegraph poles, and without payment of any com-
    pensation to the Board.

In every crossing-span the maximum tension in any wire
shall not exceed one-half the elastic limit of the wire under
the conditions of minimum temperature and wind-pressure
specified in clause 25.

At telegraph crossings the electric lines shall pass over or
under the telegraph wires or cables, as may be decided by the
Minister of Telegraphs, and shall be at least 2 ft. distant.
Where it is impracticable to cross above or below, the electric
lines may be taken through, but, when permitted to be taken
through, the crossing shall be made at a pole in a manner to
be approved by the Minister of Telegraphs.

Where telegraph lines and lead-covered telephone cables
are crossed above or below by the electric-light wires the
latter wires shall be insulated with a triple covering of jute
braiding thoroughly compounded throughout the crossing-
span.

In cases where it may be required to cross with the electric-
light wires through any other aerial wires or through cables
because of the impracticability of crossing above or below
(and crossing shall be effected above or below if possible),
all such through crossings, if permitted, shall be effected at
a pole. In every case of a through crossing, no matter whose
property the lines crossed through may be, the method of
carrying the electric-light wires across the pole, of protecting
them thereon, of preventing other wires from coming in
contact with them, and of protecting persons working on the
poles from danger of shock, shall be to the satisfaction of the
Minister of Telegraphs. The electric-light wires shall be
insulated where they pass through on the poles and over
the whole length of the span on each side of the pole crossed
through. Where the insulated wires cross through on the
pole they shall be encased in some approved hard protecting
substance for the entire length of the arms on such pole. If
metal pipe is used to encase the wires it shall be effectively
earthed.

Where the electric lines intersect telegraph lines the latter
shall be suitably insulated if deemed necessary, and when the
crossing is above and near a pole the spans on each side of
the pole shall be insulated if deemed necessary. This insula-
tion shall be effected at the expense of the Board in cases
where the telegraph lines existed previously to the erection of
the electric lines.

Where deemed necessary efficient guard-wires, effectively
earthed, or other approved protective devices, shall be
erected in a manner to meet with the approval of the
Minister of Telegraphs at all crossings or places where electric
lines intersect telegraph lines, or at any place where such
protection may be considered necessary.

Such guard-wires shall be carried on substantial supports
at a height of 2 ft. above the electric lines if the telegraph
wires pass over the electric lines, or 2 ft. above the telegraph
wires if they pass under the electric lines. In addition to the
above precautions, telegraph wires may be insulated if
deemed necessary by the Minister of Telegraphs.

The cost of all necessary guard-wires and special provi-
sions required to comply with this clause shall be borne by
the Board when the telegraph lines are erected before the
electric lines. In other cases the Board, on receipt of
notice from the District Telegraph Engineer of the Post and
Telegraph Department, or his deputy, that it is proposed to
run a telegraph line along the route, shall forthwith make
the necessary changes required to comply with this clause at
any point at which electric lines already cross such routes,
the cost of such changes being borne by the Post and
Telegraph Department.

Earth-wires.

30. Earth-wires, where led down poles, shall be protected
    by a casing for a distance of 8 ft. from the ground. A test
    shall be made every three months, and oftener if required,
    of all earths, to ensure that the earth-wire is intact and that
    the earth is effective.

Railway Crossings.

31. No work of any nature shall be erected or constructed
    in pursuance of this license upon, over, or under any part of
    the Government railways until the Board has obtained the
    consent of the Minister of Railways thereto, as required by
    section 4 of the Government Railways Amendment Act, 1910
    (No. 2).

Service Connections.

32. Service connections from aerial lines shall be taken
    direct from insulators, and shall not be tapped off between
    insulators. They shall be led as directly as possible to insu-
    lators 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 aerial line which is outside a building
and is within 7 ft. from any part of the building shall be
rubber-insulated.

Facilities for Service Connections, &c.

33. Where electric lines are on one side of the road and
    telegraph lines on the other, and service is required to be
    given from either to the other side of the road, the Board
    and the Minister of Telegraphs shall give to each other
    reasonable facilities as far as possible to effect supply. In
    special circumstances the Minister of Telegraphs and the
    Board shall give to each other reasonable facilities for the
    joint use of poles.

Arc Lamps.

34. 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.

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.

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.

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 230 volts. Resistances for the regulation of arc lamps, if
exterior to the lamp, shall be mounted on incombustible