3208
THE NEW ZEALAND GAZETTE.
[No. 82

such circuit shall be tested for insulation at least once in
every week, and the said Council shall duly record the
results of the tests, and forward copies of such records
at the end of each week to the District Engineer, Gisborne.
17. The sectional area of the conductor in any electric
line laid or erected in any street shall be not less than
that of a strand of seven wires, each of which is of No. 20
standard wire gauge, and the sectional area of every wire
in a strand forming any such conductor shall be not less
than that gauge.
18. All material used for insulating electric lines or
apparatus shall be of the best quality, and thoroughly
durable and efficient, having regard to the conditions of
its use. Suitable provision shall be made for the protec-
tion of the insulating material against injury or removal.
If the protection so provided is wholly or partly metallic,
it shall be efficiently connected with earth.
19. All metal pipes or coverings containing any electric
wire shall be efficiently connected with earth, and shall be
so jointed as to make good electrical connection through-
out their whole length.
20. 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.
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.
21. The variation of pressure at any consumer’s ter-
inals shall not, under any conditions of the supply which
the consumer is entitled to receive, exceed 4 per cent. from
the normal pressure at which he is being supplied.
22. Every support for an aerial line shall be of durable
material, and properly strengthened against forces due to
wind-pressure, change of direction of the line, and unequal
length of span. The factor of safety of such supports,
taking into consideration all possible stresses, including
wind-pressure at 30 lb. per square foot on plane surfaces
and 18 lb. per square foot of diametrical plane for
cylindrical surfaces, shall be at least 4 if those supports
are of iron, steel, or ferro-concrete, and at least 6 if the
supports are of wood. The stress in the aerial conductors
shall not exceed 28,000 lb. per square inch for copper and
15,000 lb. per square inch for aluminium in the extreme
case of a temperature of 12° F. and a wind-pressure of
18 lb. per square foot of diametrical plane occurring simul-
taneously.
23. Earth wires, where led down poles, shall be protected
by casing for a distance of 8 ft. from the ground.
24. All aerial wires shall be attached to suitable insu-
lators 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 insulation will not be impaired where
they are secured to the insulator.
25. Any aerial wire 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 part of any building or erection other than a support
for the line, except where brought into a building for the
purpose of supply. No work of any nature shall be erected
or constructed upon, over, or under any part of the Go-
vernment railway 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).
26. 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 appli-
ance. Every portion of any service line which is outside a
building and is within 7 ft. from any part of the building
shall be rubber-insulated.
27. Where an aerial line crosses a street, the angle be-
tween the line and the direction of the street at the place
of crossing shall be not less than 60 degrees, and the spans
shall be as short as possible.
28. 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.
29. Efficient guard-wires shall be erected in a manner to
meet with the approval of the Minister of Telegraphs at
all such crossings and places where electric-light wires
intersect telegraph or telephone wires, as may be required
by the said Minister to be so protected. The said Council
shall bear the expense of such guard-wires in all cases
where an electric-light wire intersects a telegraph or other
wire previously existing.
30. Every aerial line, including its supports, its con-
ductors, and their insulating covering, and all the struc-
tural 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.
31. 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 for that purpose.
32. All underground electric cables shall be laid as far
as possible under the pavements and near the kerb-line.
33. All conduits, pipes, casings, and street boxes used
as receptacles for electric lines shall be constructed of
durable material, and shall be of ample strength to pre-
vent damage from heavy traffic, and reasonable means
shall be taken to prevent the accumulation of gas in
such receptacles.
34. All underground cables shall be thoroughly in-
sulated, and carefully laid and jointed, and protected by
permanent material in such a way that it shall be im-
possible for the conductor or its sheath to come into con-
tact with any external metallic or other substance, or for
a pick or other tool to come accidentally into contact with
the conductor or its sheath.
35. All underground metal conduits, pipes, or casings
containing 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.
36. The covers of street-boxes shall be so secured that
they cannot be opened except by means of a special ap-
pliance. Street-boxes shall be inspected from time to
time for the presence of gas, and suitable action shall be
taken to check its influx and accumulation.
37. The said Council shall be responsible for all electric
lines or wires, fittings, and apparatus belonging to it, or
under its control, which may be upon a consumer’s pre-
mises, being maintained in a safe condition and in all
respects fit for supplying energy.
38. 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.
39. Where supply is given to a consumer at 440 volts for
power purposes—
(a.) The frame of every electric motor shall be efficiently
connected with earth.
(b.) The consumer’s wires forming the connections to
motors, or otherwise in connection with the supply,
shall be, as far as practicable, completely enclosed
in strong metal casing efficiently connected with
earth, or they shall be fixed in such a manner that
there shall be no danger of any shock.
(c.) The supply to every motor shall be controlled by
means of an efficient cut-off switch, placed in
such a position as to be easily handled by the
person in charge of the motor, and connected so
that by its means all pressure can be cut off from
the motor itself, and from any regulating switch,
resistance, or other device in connection therewith.
(d.) Switches, efficient fuses, or other automatic circuit-
breakers shall be provided, so as to protect the
circuits from excess of current, and all switches
and cut-outs shall be so enclosed and protected
that there shall be no danger of any shock being
obtained in the ordinary handling thereof, or of
any fire being caused by their normal or abnormal
action.
(e.) A notice shall be fixed in a conspicuous position, at
every motor and switchboard in connection with
the supply, forbidding unauthorized persons to
touch the motors or apparatus.
40. Where supply is given at 440 volts for arc lamps in
series—
(a.) The consumer’s wires forming the connections to
the arc lamps, or otherwise in connection with the
supply, shall be, as far as practicable, completely
enclosed in strong metal casing efficiently connected
with earth, or they shall be fixed in such a manner
that there shall be no danger of any shock.
(b.) The supply to every arc lamp shall be controlled by
means of an efficient cut-off switch, placed in such
a position as to be easily handled by the person
in charge of the arc lighting, and connected so
that by its means all pressure can be cut off from
the arc lamp itself, and from any regulating
switch, resistance, or other device in connection
therewith. Provided that where the arc lamps
are connected in series across the outer conductors
of a three-wire system, it shall be sufficient if
one such switch is provided for each series of
arc lamps.
(c.) Switches, efficient fuses, or other automatic cut-outs
shall be provided, so as to protect the circuits
from excess of current, and all switches and cut-
outs shall be so enclosed and protected that there