ELECTRICITY SUPPLY REGULATIONS

ELECTRICITY SUPPLY REGULATIONS

ELECTRICITY SUPPLY.
ELECTRICITY SUPPLY REGULATIONS.
(Cap. 103, section 3).
(Ordinance No. iS of 1911).

[19th May, 1911.]

Definitions.
1.In these regulations-
'consumer's wires' means any electric lines on a con
sumer's premises which are connected with the service lines
of the company at the consumer's terminals;
'overhead line' means any electric line which is placed
above ground and in the open air;
'pressure' means the difference of electrical potential
between any two conductors through which a supply
of energy is given, or between any part of either con-
ductor and the earth; and-
(a)where the conditions of the supply are such that the
pressure at any pair of consumer's terminals does not
exceed 250 voits, the supply shall be deemed a low
pressure supply;
(b)where the conditions of the supply are such that the
pressure exceeds 250 voits but does not exceed 650
voits, the supply shall be deemed a medium pressure
supply;
(c)where the conditions of the supply are such that the
pressure exceeds 650 voits but does not exceed 3,000
voits, the supply shall be deemed a high pressure supply; and
(d)where the conditions of the supply are such that the
pressure exceeds 3,000 voits, the supply shall be deemed
an extra high pressure supply;
'sub-station' means any premises in which energy is
transformed or converted for the purpose of supply to
consumers, and which are large enough to admit the
entrance of a person after the transforming or converting
apparatus is in position : Provided that for the purpose of
these regulations any place within any such premises which
is used solely for some purpose other than such
transformation or conversion shall not be deemed to form
part of a sub-station.





Where these regulations require any metallic body to be
'efficiently connected with earth', it shall be connected with the
general mass of earth in such manner as will ensure at all times
an immediate and safe discharge of electrical energy.

General.
2. The 'pressure of a supply delivered to anv consumer shall
not exceed the limit of low pressure except for special purposes,
for which a medium pressure supply may be given on the
consumer undertaking to comply with the following conditions
(a) where the supply is for power purposes-
(i) the frame of every electric motor shall be
efficiently connected with earth;
(ii) tile consumer's wires forming the connexions to
motors, or otherwise in connexion with the supply, shall
be, as far as practicable, coin
pletely inclosed in strong metal easing efficiently
connected with earth, or they shall be fixed in such a
manner that there shall be no danger of any shock;
(iii) 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
connexion therewith;
(iv) 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 inclosed 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 ;
(v) a notice shall be fixed in a conspicuous position at
every motor and switch board in connexion with the
supply forbiding unauthorized persons to touch the
motors or apparatus;





(b) where the supply is for arc lamps in series-
(i) the consumer's wires forming the connexions to
the arc lamps, or otherwise in connexion with the
supply, shall be, as far as practicable, completely
inclosed 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;
(ii) the supply to every are 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
connexion 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 be provided for each series of are
lamps;
(iii) 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 inclosed 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;
(c) where the supply is for incandescent lamps in series,
unless the Director of Public Works otherwise allows
(i) the consumer's wires forming the connexions to
the incandescent lamps, or otherwise in connexion with
the supply, shall be completely inclosed in strong metal
casing and this casing together with the switches and
lamp holders, if metallic, shall be efficiently connected
with earth;
(ii) 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 inclosed 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
action.





(d) where the supply is for any special purpose other than those
above mentioned, or where the pressure of the supply
exceeds the limits of medium pressure, it shall be subject to
such other regulations as the Governor in Council may
prescribe.

3. When the pressure between the outer conductors of a three-wire
system exceeds 250 voits and the three wires of the system or two pairs
of wires are brought into a consumer's premises, the supply shall be
given to two pairs of terminals arranged in such a manner that there
shall be no danger of any shock, and the wiring from those terminals
shall be kept distinct.

4. The sectional area of the conductor in any electric line other than
low tension laid or erected in any street after 2nd December, 1921, shall
not be less than that of a strand of seven wires, each of which is of No.
22 standard wire gauge, and the sectional area of every wire in a strand
forming any such conductor shall not be less than that gauge, and
where such stranded conductor is erected it ,shall be suspended from a
suitable bearer wire or shall be protected by a suitable cradle fixed
underneath. In the case of low tension conductors in any electric line
the sectional area shall not be less than that of a single wire of No. 16
standard wire gauge efficiently insulated.
This regulation shall not apply in the case of an electric line placed
in a lamp post.

5. Every low pressure and medium pressure main, after having been
placed in position and before it is used for the purposes of supply, shall
withstand a pressure equal to the maximum pressure to which it is
intended to be subjected in use, and in any case at least 200 voits, and
further, before being used as aforesaid it shall be tested for insulation,
and the company shall duly record the results of the tests of each main
or section of a main.

6. A high pressure circuit shall not be brought into use unless the
insulation of every part thereof has withstood the continuous
application, during one hour, in the case of every electric line, of a
pressure equal to the full





working pressure to which it is intended to be subjected in use,
and in the case of every machine, device or apparatus, of a
pressure equal to the full working pressure to which it is intended
to be subjected.
The company shall duly record the results of each test.

7. There shall be maintained by the company at each station
or sub-station as may be necessary a leakage indicator of
approved pattern and so arranged that the leakage on each main
feeder can be readily ascertained at any time and a weekly test
recorded. If at any time the leakage is in the opinion of the
Director of Public Works excessive, fie shall require the company
to remedy the same and it shall forthwith. be remedied: Provided
that where any part of any electric circuit is connected with
earth, either in accordance with these regulations or with the
approval of the Director of Public Works, the provisions of this
regulation shall not apply to that part of that circuit so long as the
connexion with earth exists.

8. Every high pressure main, conductor or other apparatus
shall be protected by a suitable fuse or automatic circuit-breaker:
Provided that it shall not be incumbent upon the company to
provide such a fuse or circuit-breaker for the outer conductor of
a concentric main which is, in accordance with these regulations
or with the approval of the Director of Public Works, efficiently
connected with earth.

9. In every case where a high pressure supply is
transformed for the purpose of supply to one or more consumers,
some suitable automatic and quick-acting means shall be provided
to protect the consumer's wires from any accidental contact with
or leakage from the high pressure circuit, either within or without
the transforming apparatus.

10. The metallic portion of every high pressure transformer,
with the exception of the conductors thereof, shall be efficiently
connected with earth except in respect of transformers supported
on poles at such a height as to be inaccessible except by the use
of a ladder or other special appliance: Provided that in such
cases such poles shall be efficiently connected with earth.





11. Where any portion of any electric line or any support for
any electric line is exposed in such a position as to be liable to
cause injury from lightning, it shall be efficiently protected against
such liability.
12. Where any accident by explosion or fire. or any other
accident of such kind as to have caused or to be likely to have
caused loss of life or personal injury has occurred at any part of
any electric line or work, the company shall give immediate
notice thereof to the Director of Public Works.

PART 1.-General.
13. (1) Line conductors shall be copper, aluminium or such
other materials as i-nay be approved by the Director of Public
Works.
(2) All line conductors at the time of erection shall comply,
as regards elongation, breaking load and elasticity, with the
specification of the British Engineering Standards Association
then in force.
(3) The minimum permissible size for copper and other line
conductors (other than service lines) shall be such as to have an
actual breaking load of not less than 1,237 lb., the equivalent
minimum cross-sectional area and weight per mile for copper
being as follows
Conductor. Cross-sectional Weight per
area. mile.
sq. in. lb.
No. 8 S.W.G . 0.0201 409
The minimum permissible size of service line shall be such
as to have an actual breaking load of not less than 816 lb., the
equivalent minimum cross-sectional area and weight per mile for
copper being as follows
Conductor. Cross-sectional Weight per
area. mile.
sq. in. lb.
No. 10 S.W.G . 0.0129 262
(4) Line conductors shall be rendered inaccessible to any
person from any building or other place without the use of a
ladder or other special appliance. Regard shall





be had to the normal use by the occupier of any premises or land and
where necessary (a) the height of the line conductors shall be
increased to provide sufficient clearance for safety in accordance with
such use, and (b) provision as hereinafter prescribed in paragraph (14)
OF (17) shall be made to prevent danger.
(5) Where a line. conductor crosses over or under or
is in proximity, to any other overhead wire, precautions
shall be taken by the company to prevent contact, due to
breakage or otherwise, between the line conductor and the
other overhead wire, or between the other wire and the
line conductor : Provided that this paragraph shall not be
deemed to require the company to take precautions against
contact between a broken line conductor and other auxiliary
conductors and earth wires carried on the same suppor and
forming part of the same overhead line.
(6) Line conductors shall be attached to suitable insulators carried
on. supports of iron, steel or reinforced concrete. Special precautions
shall be taken to prevent the corrosion of all metal work at or below the
surface of the ground.
(7) The supports, in conjunction with stays or struts if provided,
shall withstand the longitudinal, transverse and vertical loads due to
the wind pressure hereinafter specified without damage and without
movement in the ground. In no case shall the strength of a support in
the direction of the overhead line be less than one-quarter the required
strength in a direction transverse to the line.
The following factors of safety shall apply to each support
Material. Factor of safety.
Iron or steel 3
Reinforced concrete 4
These factors of safety shall be calculated on the assumption that
all line conductors, cables and wires carried by the supports are at a
temperature Of 70' F., and that together with the supports they are
subjected to a wind pressure Of 40 lb. per square foot.





(8) Service lines shall be connected to line conductors at a point of
support only and shall be fixed to insulators on consumers' premises.
Every part of a service line (other than a neutral conductor connected
with earth) which is accessible from a building with the use of a ladder
or other special appliance shall be efficiently protected either by
insulating material or by other means approved by the Director of Public
Works.
(9) Where line conductors forming parts of systems at different
voltages are erected on the same poles or supports adequate provision
shall be made to guard against danger to linesmen and from the lower
voltage system being charged above its normal voltage by leakage from
or contact with the higher voltage system; and the type of construction
shall be subject to the prior approval of the Director of Public Works.
(10) Every overhead line, including its supports and structural parts,
and electrical appliances and devices belonging to or connected
therewith, shall be regularity inspected and efficiently maintained.
(11) All materials used shall at the time of erection con-
form to the specifications for the time being in force of
the British Engineering Standards Association and the
Post Office (London) for the construction of aerial lines,
so far as the same are applicable and are not inconsistent
with this regulation.

PART II-Specific.
(Applicable according to the voltage between line conductors where no part
of the system is connected with earth, or according to the voltage to earth where
part of the system is connected with earth.)

A.-For voltages not exceeding 650 volts direct current
and 325 volts alternating current.
(12) The factor of safety of line conductors shall be 2. The factor
of safety shall be based on the breaking load and shall be calculated on
the assumption that the line conductors are at a temperature Of 70' F.
and that they are subjected to a wind pressure of 4o lb. per square foot.





(13) The height from the ground of any line conductor
(other than a service line), earth wire or auxiliary conductor
at any point of the span at a temperature of 16o' F. shall
not, except with the consent of the Director of Public
Works, be less than ig feet across a public road or 17 feet
in other positions. A height of iS feet may be adopted
in situations inaccessible to vehicular traffic.

Where a service line is carried across or along a
carriage-way, the height of the line from the ground at
any part of the carriage-way shall not, except with the
consent of the Director of Public Works, be less than 19
feet and 17 feet respectively.

(14) Where the voltage to earth exceeds 250 volts direct
current or 125 volts alternating current, precaution should
be taken to prevent danger,
(I) from a broken line conductor by the provision of-
(a) a neutral or earthed conductor carried continuously
from pole to pole, and so arranged in relation to
the other conductors that in the event of breakage
of any one of them the line conductor shall make
contact with the earthed wire; or
(b) other means approved by the Director of Public
Works;
(II) from leakage by the provision-
(a) in cases where metal poles are used, of-
(i) an earthed wire, running from pole to pole
and connected to the poles; or
(ii) a suitable metal framework to support the
insulators carrying the line conductors, the frame-
work being insulated from the pole but connected
to the neutral conductor; or
(iii) other means approved by the Director of
Public Works;
(b) in cases where wooden poles are used, of-
(i) a bonding wire connected to the supporting
metal work of all insulators, the bonding wire
terminating at the lowest part of the supporting
metal work., or
(ii) other means approved by the Director of
Public Works.





All stay wires other than those which are connected with earth by
means of a continuous earth wire shall be insulated to prevent danger
from leakage. For this purpose an insulator shall be placed in each stay
wire at a height of not less than 10 feet from the ground.

B.-For voltages exceeding 650 volts direct current
and 325 volts alternating current.
(15) The factor of safety of line conductors shall be 2. The factor of
safety shall be based on the breaking load and shall be calculated on the
assumption that the line conductors are at a temperature of 7o' F. and
that they are subjected to a wind pressure Of 40 lb. per square foot.
(16) The height from the ground of any line conductor at any point
on the span at a temperature of 16o' F. shall not, except with the consent
of the Director of Public Works,
be less than the height hereunder stated-
Voltages not exceeding 66,000 volts 20 feet.
Voltages exceeding 66,000 volts and not
exceeding 1 10,000 Volts 21 feet.
Voltages exceeding 110,000 volts and not
exceeding 165,ooo volts 22 feet.
Voltages exceeding 165,ooo volts 23 feet.
The height from the ground of an earth wire or auxiliary
conductor shall not be less than the minimum heights
prescribed in paragraph (13) above.
(17) Adequate means shall be provided to render any line
conductor dead or harmless to human beings or animals in the event of
it falling, due to breakage or otherwise.
All metal work other than conductors shall be permanentIy and
efficiently connected with earth. For this purpose- a continuous earth
wire shall be provided and connected with earth at four points in every
mile, the spacing between the points being as nearly equidistant as
possible, or alternatively the metal work shall be connected to an
effective earthing device at each individual support. The design and
construction of the system of earth connexions shall be such that when
contact is made between a line conductor and metal connected with
earth the resulting leakage current shall not be less than twice the
leakage cur-





rent required to operate the devices which make the line dead or
harmless to human beings or animals.
(18) Where an overhead line is erected along or across a public
road or canal or across a railway all wires including earth wires and
auxiliary conductors shall be placed at the appropriate height from the
ground specified in paragraph (16) for line conductors, and the
following additional precautions shall be taken to prevent danger
(a) in the case of a line erected along a public road or canal (or
within 50 feet thereof) there shall be provided
(i) duplicate insulators supporting the conductors; or
(ii) a device to ensure that in the event of a line conductor
falling it shall be put to earth ; or
(iii) other means approved by the Director of Public Works
(b) in the case of a line erected across a public road, canal or
railway there shall be provided
(i) duplicate insulators for supporting the line conductor
and a device to ensure that in the event of a line conductor
falling it shall be put to earth; or
(ii) duplicate insulators supporting duplicate conductors
tied at intervals not exceeding five feet; or
(iii) other means approved by the Director of Public Works.
(19) Supports shall be numbered consecutively and each support
shall have a danger notice of a permanent character securely fixed to it.
Adequate provision shall also be made to prevent unauthorized
climbing.
(20) All overhead lines shall be removed on ceasing to be used for
the purposes for which they were erected.

14. Save as above provided, overhead lines shall not be erected
except in accordance with such regulations as the Governor in Council
may prescribe.





Electric lines other than overhead lines.
15. All conduits, pipes, casings and street boxes used as
receptacles for electric lines shall be constructed of durable material, and
where laid under carriage-ways shall be of ample strength to prevent
damage from heavy traffic, and reasonable means shall be taken by the
company to prevent accumulation of gas in such receptacles.

16. Where any electric line crosses, or is in proximity to, any
metallic substance, special precautions shall be taken by the company
against the possibility of any electrical charging of the metallic
substance from the line or from any metal conduit, pipe or casing
inclosing the line.

17. All metal conduits, pipes or casings containing any high
pressure electric line shall be efficiently connected with earth, and shall
be so jointed and connected across all street boxes and other openings
as to make good electrical connexion throughout their whole length.

18. (1) Where the conductors of electric lines placed in any conduit
are not continuously covered with insulating material, they shall be
secured in position, and no unfixed uninsulated material of a conducting
nature shall be contained in the conduit. No such conductor shall be at
a pressure exceeding 300 volts, from earth.
(2) Adequate precau tions shall also be taken to ensure that no
accumulation of water shall take place in any part of the conduit and to
prevent any dangerous access of moisture to the conductors or the
insulators.
(3) The insulators of any such electric line shall be so disposed
that they can be readily inspected; but this requirement shall not apply
to any such insulators which before 2nd December, 1921, were not
required by any regulation then in force to be so capable of ready
inspection.

19. Every portion of any high pressure electric line placed above
the surface of the ground, or in any subway not in the sole occupation
of the company, shall be completely inclosed either in a tube of highly
insulating material embedded in brickwork, masonry or cement-concrete,
or in strong metal casing efficiently connected with earth.





20. Where any high pressure electric line is laid beneath the
surface of the ground, efficient means shall be taken to render it
impossible that the surface of the ground or any neighbouring electric
line or conductor shall become charged by leakage from the high
pressure electric line.

21. A high pressure electric line shall not, except with the consent
of the Director of Public Works, be used for the supply of energy before
it has been completely laid, properly jointed, examined and tested, or
until it is in the sole charge of the company, and every such line shall
during its use be in the sole charge of the company.

Sub-stations and street boxes.
22. Sub-stations shall be established in suitable places and shall be
in the sole occupation and charge of the company. Sub-stations shall be
erected above ground wherever possible, but where necessarily
underground, due provision shall be made for ventilation and for
drainage.

23. In addition to the provisions contained in regulation iS as to the
construction of receptacles for electric lines, the following conditions
shall be observed with respect to street boxes
(a) the covers of all street boxes shall be so secured that they
cannot be opened except by means of a special appliance;
(b) the covers of all street boxes containing high pressure
apparatus other than cables shall be connected to strips of
metal laid immediately underneath the street, and efficient
means shall be taken to render it impossible that the covers or
other exposed parts of these boxes, or any adjacent material
forming the surface of the street, shall become electrically
charged, whether by reason of leakage, defect or otherwise;
(c) where street boxes are used as transformer chambers,
reasonable means shall be taken to prevent as far as possible
any influx of water, either from the adjacent soil or by means
of pipes; and in the case of any such street box exceeding one
cubic yard in capacity, ample provision shall be made, by





ventilation or otherwise, for the immediate escape of any gas
which may by accident have obtained access to the box, and
for the prevention of danger from sparking;
(d) all street boxes shall be regularly inspected for the presence of
gas and if any influx or accumulation is discovered the
company shall give immediate notice to the company whose
gas mains are laid in the neighbourhood of the street box;
(e) where mains at different pressures pass through the same
street box they shall be readily distinguishable from one
another.
24. The maximum power supplied to any underground sub-station
or street box shall not, without the consent of the Director of Public
Works, exceed 30 kilowatts in the case of a sub-station or street box
containing a single transformer, or 75 kilowatts in the case of a sub-
station or street box containing two or more transformers.

Consumer's premises.
25. The company 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.
26. 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.
27. (1) A suitable safety fuse or other automatic circuit-breaker shall
be inserted in each service line within a consumer's premises as close as
possible to the point of entry, and contained within a suitable locked or
sealed receptacle of fireproof construction, except in cases where the
service line is protected by fuses in a street box; but no fuse or
automatic circuit-breaker shall be inserted in the intermediate conductor
of a three-wire system.
(2) Wherever a seal is found broken on a consumer's premises and
unless the same has been broken by an employee of the company, the
consumer shall be liable to a penalty of five dollars.





28. All service lines and apparatus placed on a consumer's
premises shall be highly insulated and 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.

29. Where the general supply of energy is a high pressure supply
and transforming apparatus is installed on a consumer's premises, the
whole of the high pressure service lines, conductors and apparatus,
including the transforming apparatus itself, so far as they are on the
consumer's premises, shall be completely inclosed in solid walls or in
strong metal casing efficiently connected with earth and securely
fastened throughout.

30. The company shall not connect with its mains consumers' wires
or fittings that would cause an undue leakage or that are, in the opinion
of the company, constructed or arranged in such a manner as to cause a
danger of shock or fire. Where the company declines to make such
connexion it shall serve upon the consumer a notice stating its reasons
for so declining.

31. (1) For the purpose of ascertaining that a consumer's wires and
fittings have not subsequently fallen into an unsafe condition the
company shall make periodical tests at intervals of not more than five
years. For the purposes of such tests, and for the purpose of
discovering whether a defect exists at some part of a consumer's
installation within or upon the consumer's premises, the company may,
by notice in writing, require the consumer at some reasonable time after
the service of the notice to permit any officer of the company to inspect
and test the installation. Service of any such notice may be effected by
letter sent by ordinary post addressed to the consumer's premises, or by
leaving the notice at such premises.
(2) If the consumer does not give all due facilities for such
inspection and testing within a reasonable time after the service of the
notice, the company shall forthwith dis-





continue the supply of energy to the consumer's premises, giving
immediate notice of the discontinuance to the consumer, and shall not
recommence the supply until the test has been carried out. The period of
discontinuance as aforesaid shall be excluded in computing the interval
of not more than five years above mentioned.
(3) If after such inspection and testing the company is reasonably
satisfied that a defect exists at some part of a consumer's installation the
company shall by notice require the consumer within a reasonable time
after the service of such notice, to remove the defect.
(4) If after retesting by an officer of the company the installation is
found to be still defective, the company shall forthwith discontinue the
supply of energy to the premises in question. The supply shall not be
reconnected until the defect has been removed and the charges for
reconnection and retesting have been paid to the company.
32. (1) If any consumer is dissatisfied with the action of the
company in refusing to give or in discontinuing or in not recommencing
the supply, of energy to his premises, the wires and fittings of that
consumer shall, on his application and oil payment of a fee of ten
dollars, be tested for the existence of leakage by the Director of Public
Works.
(2) This regulation shall be indorsed oil every notice given under
the provisions of regulation 30 or 31.

33. Every person who makes any addition to any electrical
installation connected to the company's main without obtaining the
written consent of the company thereto shall be liable to a penalty of
one hundred dollars for every such addition.

34. Every consumer upon whose premises any such addition is
found shall be liable to a penalty of one hundred dollars for every day or
part of a day during which such addition has been in existence. In this
regulation, 'consumer' means the person in whose name the contract
for the supply of electricity to such premises was made with the
company, or if there be no such person, the principal tenant or person in
actual occupation of the premises in which such addition is found.





Arc lighting.
35. 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 ten feet from the ground.

36. 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.

Connexion of circuits with earth.
37. Where the pressure of a supply between the adjacent
conductors of a three-wire system of mains exceeds 125 volts the
intermediate conductor shall be connected with earth in accordance
with the following conditions
(a)the connexion with earth of the intermediate conductor shall
be made at one point only on each distinct circuit, namely at
the generating station, sub-station or transformer, and the
insulation of the circuit shall be efficiently maintained at all
other parts ;
(b)the current from the intermediate conductor to earth shall be
continuously recorded and if it at any time becomes excessive
steps shall be immediately taken to improve the insulation of
the system.

38. The company shall not connect any other circuit with earth
except with the approval of the Director of Public Works and subject to
such conditions as he may prescribe.

Extra high pressure.
39. (1) This regulation shall have effect in the case of a supply at
extra high pressure, and shall be in addition to and not in substitution
for the obligations imposed by the foregoing regulations.
(2) An extra high pressure main shall not be brought into use
unless, after it has been placed in position and before it is used for the
purposes of supply, the insulation of every part thereof has withstood
the continuous application, during half an hour, of pressure exceeding
the maximum pressure to which it is intended to be subject in use, that is





to say, in the case of every electric line to be used for a pressure not
exceeding 10,000 volts twice the said maximum pressure, and in the case
of a line to be used for a pressure exceeding 10,000 volts, a pressure
exceeding the said maximum pressure by 10,000 volts; and the company
shall record the results of the tests of each main or section of a main.
(3) Every extra high pressure main shall be protected by a suitable
fuse or automatic circuit-breaker, but in the case of a concentric main
that fuse or circuit-breaker shall not be inserted in any external
conductor thereof which is connected with earth.
(4) In every case where an extra high pressure supply is
transformed or converted to a reduced pressure, some suitable
automatic and quick-acting means shall be provided to protect the
reduced pressure circuits from any accidental contact with or leakage
from the extra high pressure system, either within or without the
transforming or converting apparatus.
(5) All metal conduits, pipes or casings containing any extra high
pressure electric line shall be efficiently connected with earth and shall
be so jointed and connected across all street boxes and other openings
as to make good electrical connexion throughout their whole length.
(6) Every portion of any extra high pressure electric line placed
above the surface of the ground, otherwise than in a sub-station, or in
any subway not in the sole occupation of the company, shall be
completely inclosed either in a tube of highly insulated material
embedded in brickwork, masonry or cement-concrete, or in strong metal
casing efficiently connected with earth.
(7)(a) Where extra high pressure mains for threephase supply
consist of insulated conductors laid together, provision shall
be made to ensure that neither the ground nor any
neighbouring or electric line or conductor can become
charged by leakage from any such main.
(b)Where this provision is made by a copper strip under a lead
sheath that strip shall be not less than sixteen-thousandths of
an inch in thickness, and where it is made by steel wires
outside a lead sheath





each of those wires shall be not less than one-tenth of an
inch in diameter.
(c) Where the mains are inclosed in a lead sheath the sheath shall
be not less than one-tenth of an inch in thickness and shall be
permanently and efficiently connected with earth.
(8) Extra high pressure mains for single phase supply and all cables
connected therewith shall consist either of two concentric conductors
or of separate conductors. Where concentric conductors are used the
insulation shall be maintained efficiently throughout except that the
outer conductor shall be connected with earth at one point, and where
separate conductors are used provision shall be made as in the case of
mains for three-phase supply to ensure that neither the ground nor any
neighbouring electric line or conductor can become charged by leakage.
(9) An extra high pressure electric line shall not be brought into use
for the supply of energy before it has been completely laid, properly
jointed, examined and tested or until it is in the sole charge of the
company, and every such line shall during its use be in the sole charge
of the company.
(10) Extra high pressure mains shall not pass through the same
street box with other mains, unless they are inclosed in strong metal
casing; and street boxes containing high pressure mains shall not
contain pipes for water, gas or other service, or electric mains belonging
to another undertaking: Provided that any such street box may contain
telephone wires belonging to the company.
(11) Sub-stations supplied at extra high pressure shall be established
in suitable places and shall be in the sole occupation of the company.
(12) Sub-stations constructed below the surface of any street after
2nd December, 1921, to which an extra high pressure is to be given shall
not contain switches or other apparatus than transformers.
(13) The transforming apparatus at any sub-station supplied at
extra high pressure shall be so arranged that
there shall be no danger of any mains connected therewith





being charged to any pressure beyond the limits of pressure for
which those mains are intended.
(14) In delivering the energy to a sub-station at extra high
pressure the company shall exercise all due precautions so as to
avoid risk of causing fire on the premises.
(15) All extra high pressure electric lines and apparatus
placed in a sub-station shall be highly insulated and throughly
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
inadvertently touched. All such lines shall be so fixed and
protected as to prevent the possibility of electrical discharge to
any adjacent metallic substance.
(16) The Director of Public Works shall be entitled to enter at
all times any of the generating stations or substations of the
company supplying or supplied at an extra
high pressure, and to make any such examination and tests of the
mains, machines, transformers or other apparatus in use in those
stations as may appear to him necessary, and the company shall
afford all due facilities for any such examination and tests.
(17) Where any extra high pressure circuit is connected with
earth the connextion shall be made at one point only, namely at
the generating station, sub-station or transformer, and the
insulation of the circuit shall, except at that point, be efficiently
maintained throughout.
(18) (a) The neutral point of the star winding of each distinct
three-phase circuit, used for extra high pressure, may be
connected with earth or may be insulated. If connected
with earth through a resistance, that resistance shall be
sufficiently low to ensure that the fuse or automatic
circuit-breaker in the mains shall act.
(b)If the neutral point is not connected with earth a
separate electro-static voltmeter placed in a conspicuous
position in the generating station shall be connected
between each circuit and earth; and if the indications of
the voltmeters show that the insulation of any of the
circuits is faulty, immediate steps shall be taken to
restore the insulation.





Penalties.
40. (1) If the Company makes default in complying with any
of these regulations, it shall be liable to a penalty of one hundred
dollars for every such default and in the case of continuing
offence to a further penalty of one hundred dollars for each day
during which the offence continues.
(2) The recovery of a penalty under these regulations shall not
affect the liability of the company to make compensation in
respect of any damage or injury which may be caused by reason
of the default.
Exemptions.
41. Nothing in these regulations shall be deemed to authorize
or require the company to make any examination, inspection or
test of any wires, fittings, installations, apparatus or equipment of
the Hong Kong Government, or of the naval, military or air force
authorities, or to authorize entry for such purposes by the
company's agents, servants or workmen in or upon the property
of the said Government or authorities.

42. The Governor in Council may at any time, upon it
appearing to him that adequate provision has been made for the
examination, inspection and testing of the wires, fittings,
installations, apparatus and equipment in or upon any works,
building or other premises, by order specifying such works,
building or premises, exempt the same from examination,
inspection and testing under these regulations.

Citation.
43. These regulations may be cited as the Electricity Supply
Regulations.
Regulations Fraser, vol. 2, p. 686. Interpretation.
[r. 1 cont.] Pressure of supply to consumers.
[r. 2 cont.] Introduction of three-wire system into consumer's premises. Minimum size of condusctors. Insulation test of low pressure and medium pressure mains. Testing of insulation of all parts of high pressure circuit.
Maintenance of insulation. Circuit-breaker for high pressure mains, etc. Transformers. Connexion of transformers with earth.
Protection from lightning. Report of accidents to Director of Public Works. Material of line conductors. Strength of line conductors. Minimum size of line conductor. Line conductors to be inaccessible.
Line conductors crossing other lines. Supports. Factor of safety of supports.
[r. 13 cont.] Service lines. Erection of line conductors at different voltages on same supports. Inspection and maintenance of lines. Materials used. Factor of safety of line conductors.
Minimum height of conductors Provision to prevent danger.
[r. 13 cont.] Factor of safety of line conductors. Minimum height of conductors. Provision to prevent danger.
Road-crossings, etc. Danger notices. Other overhead lines.
Constructions of receptacles for electric lines. Crossing pipes, etc. Electric continuity of metal conduits, etc., of high pressure line. Precautions to be taken when bare conductors are used. High pressure lines laid above ground or in subways.
Protection for surface of ground and electric lines. Completion and control of high pressure lines. Sub-stations. Street boxes.
[r. 23 cont.] Maximum power in case of underground sub-station, etc. Respon-sibility of company for lines, etc., on consumer's premises. Fire risks. Main fuses or circuit-breakers.
[r.31 cont.] Appeal to Director of Public Works. Penalty for making addition to electrical installation. Penalty on consumer for addition to electrical installation.
Height from ground. Are lamps to be guarded. Connexion with earth of a three-wire system. Connexion of other circuits with earth. Special regulations as to extra high pressure.
[r.39 cont.]
[r. 39 cont.]
Penalties for default. Specific exemptions. Exemption by Governor in Council. Citation.

Regulations Fraser, vol. 2, p. 686. Interpretation.
[r. 1 cont.] Pressure of supply to consumers.
[r. 2 cont.] Introduction of three-wire system into consumer's premises. Minimum size of condusctors. Insulation test of low pressure and medium pressure mains. Testing of insulation of all parts of high pressure circuit.
Maintenance of insulation. Circuit-breaker for high pressure mains, etc. Transformers. Connexion of transformers with earth.
Protection from lightning. Report of accidents to Director of Public Works. Material of line conductors. Strength of line conductors. Minimum size of line conductor. Line conductors to be inaccessible.
Line conductors crossing other lines. Supports. Factor of safety of supports.
[r. 13 cont.] Service lines. Erection of line conductors at different voltages on same supports. Inspection and maintenance of lines. Materials used. Factor of safety of line conductors.
Minimum height of conductors Provision to prevent danger.
[r. 13 cont.] Factor of safety of line conductors. Minimum height of conductors. Provision to prevent danger.
Road-crossings, etc. Danger notices. Other overhead lines.
Constructions of receptacles for electric lines. Crossing pipes, etc. Electric continuity of metal conduits, etc., of high pressure line. Precautions to be taken when bare conductors are used. High pressure lines laid above ground or in subways.
Protection for surface of ground and electric lines. Completion and control of high pressure lines. Sub-stations. Street boxes.
[r. 23 cont.] Maximum power in case of underground sub-station, etc. Respon-sibility of company for lines, etc., on consumer's premises. Fire risks. Main fuses or circuit-breakers.
[r.31 cont.] Appeal to Director of Public Works. Penalty for making addition to electrical installation. Penalty on consumer for addition to electrical installation.
Height from ground. Are lamps to be guarded. Connexion with earth of a three-wire system. Connexion of other circuits with earth. Special regulations as to extra high pressure.
[r.39 cont.]
[r. 39 cont.]
Penalties for default. Specific exemptions. Exemption by Governor in Council. Citation.

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