2804
THE NEW ZEALAND GAZETTE.
[No. 67

erection other than a support for the wire, except where led
to transformers or brought into a building for the purpose of
supply.

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, if carrying 35,000-volt lines
only, shall be such that the moment resulting from a wind-
pressure of 30 lb. per square foot of plane surface and 18 lb.
per square foot of diametrical 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 carrying distribution-lines 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 carrying distribution-lines
shall not exceed 200 ft. except by approval of the Minister.

10. Location of Overhead Lines.

Except by permission of the Minister of Telegraphs, or
subject to an agreement between the Post and Telegraph
Department and the said Council, all overhead electric-light
pole 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-light wires necessitates the altera-
tion of any existing lines, and such alteration is approved by
the Minister of Telegraphs, the expense of the alteration shall
be borne by the said Council.

Where electric lines are on one side of the street and electric-
telegraph lines on the other, and service is required to be
given from either to the other side of the street, the said
Council and the Minister of Telegraphs shall give to each
other reasonable facilities as far as possible to effect supply.

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

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

Where an aerial line crosses a street the angle between the
line and the direction of the street at the place of crossing
shall not be less than 60 degrees, and the span shall be as short
as possible.

11. Telegraph and Telephone Lines.

Where electric lines are permitted to be supported on tele-
graph poles all details of the supports and of the insulation
shall be approved by the Minister of Telegraphs, who may
require such electric lines at any time to be removed from such
telegraph poles on reasonable notice and without compensa-
tion of any description.

Throughout the whole area of supply the permission to place
electric-light and power wires on the Telegraph Department's
poles shall be restricted as far as possible, and in no case shall
such wires be attached to the Telegraph Department's poles
without the approval of the Minister of Telegraphs being first
obtained.

At telegraph crossings the electric lines shall pass over or
under the telegraph wires as may be decided by the Minister
of Telegraphs. At such crossings high-pressure wires, and
low-pressure wires over 400 volts, shall be insulated with not
less than 600 megohm grade V.I.R., low-pressure wires of
400 volts and under with triple weatherproof covering, and
extra high-pressure wires shall be subject to special conditions
to be imposed by the Minister of Telegraphs in each case of
crossing. Where the electric lines other than extra high-
pressure lines cross telegraph wires, or if any telegraph wire
is hereafter installed so as to cross the electric lines, and at
such other points as may be deemed necessary by the Minister
of Telegraphs, approved guard-wires effectively earthed or
other protective devices shall be erected. 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 provisions
required to comply with this clause shall be borne by the said
Council in all cases where the telegraph wires exist prior to
the erection of electric lines.

12. Earth Wires.

Earth wires where led down poles shall be protected with
substantial casing for a distance of 8 ft. from the ground.

13. Railway Crossings.

No work of any nature shall be erected or constructed upon,
over, or under any part of the New Zealand Government
Railways until the said Council has obtained the consent of
the Minister of Railways thereto, as required by section 4 of
the Government Railways Amendment Act, 1910 (No. 2).

14. Service Connections to Overhead Lines.

Service lines shall be taken from insulators to insulators
supported and firmly attached to a pole or 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
and accessible therefrom shall be rubber insulated except the
neutral.

15. Maintenance.

Every aerial line, including its supports, its conductors, and
their insulating covering, and all structural parts and electric
appliances and devices belonging to or connected with the
line, shall be duly and efficiently maintained as regards both
electrical and mechanical conditions. All extra high-pressure
main transmission lines shall be patrolled at least tri-weekly,
and all trees in their vicinity shall be kept well cut back.
The extra high-pressure branch transmission lines shall be
patrolled at least bi-weekly.

16. Transformers.

Transformers shall be placed either on poles or in sub-
stations. Where transformers are placed on poles they shall
be fitted with watertight cases and attached to the poles at
such a height as to make them inaccessible except by means
of a ladder or other special appliance. Where transformers
are placed within sub-stations, the sub-stations shall be
inaccessible except to authorized persons. All high-pressure
conductors therein shall be thoroughly insulated or protected
from accidental contact. A substantial insulating rubber mat
or insulated wooden platform and rubber gloves shall be
supplied. The cases of all transformers, whether within or
without a sub-station, shall be earthed by means of a copper
conductor at least 0·022 square inch in section.

17. Lightning-arresters.

Where any portion of any electric line or support for an
electric line is exposed in such a position as to be liable to
injury from lightning it shall be efficiently protected against
such liability.

18. Underground Conductors.

Underground conductors shall be thoroughly insulated, and
shall be protected from mechanical damage by wooden boxing
or earthenware, stoneware, concrete, iron, or fibre conduits or
pipes. They shall be laid, wherever possible, under the foot-
paths and with a cover of at least 12 in. from the surface of
the pavement. Where laid under the roadway this cover
shall be increased to 2 ft.

All conduits, pipes, casings, and street boxes used as re-
ceptacles for electric lines shall be constructed of durable
material and shall be of ample strength to prevent damage
from heavy traffic, and reasonable means shall be taken to
prevent the accumulation of gas in such receptacles.

Where any underground line crosses or is in proximity to
any metallic substance, special precaution shall be taken
against the possibility of any electrical charging of the metallic
substance from the line, or from any metallic conduit, pipe,
or casing enclosing the line.

19. Earthing Conduits.

All underground metallic conduits, pipes, or casings con-
taining an electric line shall be efficiently earthed, and shall
be so jointed and connected across all street boxes and other
openings as to make good electrical contact throughout their
whole length.

20. Street Boxes.

The covers of street boxes shall be so secured that they
cannot be opened except by means of a special appliance.
Street boxes shall be either filled solid with cable compound
or oil, or if not so filled shall be inspected from time to time
for the presence of gas, and suitable action shall be taken to
check its influx and accumulation.

21. Insulation of Electric Mains.

Every main, either overhead or underground, shall be
tested for insulation after having been placed in position
and before it is used for the purposes of supply, the testing-
pressures being at least 500 volts, and the said Council shall