ELECTRICITY SUPPLY REGULATIONS

ELECTRICITY SUPPLY REGULATIONS

ELECTRICITY SUPPLY REGULATIONS

ARRANGEMENT OF REGULATIONS

Regulation Page

1. Interpretation ........................... ... ... ... ... ... ... ... A 3

2. Pressure of supply to consumers .......... ... ... ... ... ... ... ... A 4

3. Introduction of three-wire system into consumer's premises ... ... ... ... A 5

4. Minimum size of conductors ............... ... ... ... ... ... ... ... A 5

5. Insulation test of low pressure and medium pressure mains ... ... ... A 6

6. Testing of insulation of all parts of high pressure circuit ... ... ... A 6

7. Maintenance of insulation ................ ... ... ... ... ... ... ... A 6

8. Circuit-breaker for high pressure mains. etc. ... ... ... ... ... ... A 6

9. Transformers .......................... ... ... ... ... ... ... ... ... A 6

10.Connexion of transformers with earth...... ... ... ... ... ... ... ... A 6

11.Protection from lightning ... ... ... ... ... ... ... ... ... ... A 7

12 Report of accidents to Director of Electrical and Mechanical Services ... A 7

13.Material of line conductors ... ... ... ... ... ... ... ... ... ... A 7

14.Other overhead lines .... ... ... ... ... ... ... ... ... ... ... A 11

15.Construction of receptacles for electric lines ... ... ... ... ... ... A 12

16.Crossing pipes, etc. ... ... ... ... ... ... ... ... ... ... ... A 12

17.Electric continuity of metal conduits, etc., of high pressure line ... ... A 12

18.Precautions to be taken when bare conductors are used ... ... ... ... A 12

19.High pressure lines laid above ground or in subways ... ... ... ... ... A 12

20.Protection for surface of ground and electric lines ... ... ... ... ... A 12

21.Completion and control of high pressure lines ... ... ... ... ... ... A 13

22.Sub-stations ................... ... ... ... ... ... ... ... ... A 13

23.Street boxes ................... ... ... ... ... ... ... ... ... A 13

24.Maximum power in case of underground sub-station. etc . ... ... ... ... A 13

25.Responsibility of company for lines, etc., on consumer's premises ... ... A 14

26. Fire risks ................... ... ... ... ... ... ... ... ... .... A 14

27. Main fuses or circuit-breakers A 14

28.Treatment of service lines and apparatus on consumer's premises ... .. .. A 14

29.Transformers and high pressure apparatus to be inclosed in metal, etc. .. A 14

30.Connexion to consumer's premises not to be made where undue leakage would
result ... ... ... ... ... ... ... ... ... ... ... ... . . .............. A 14

31. Discontinuance of supply on discovery of leakage on consumer's premises ... A 14

32. Appeal to Director of Electrical and Mechanical Services ... ... ... ... ... A 16

33. Penalty for making addition to electrical installation ... ... ... ... ... ...A 16

34. Penalty on consumer for addition to electrical installation ... ... ... ... . A 16

35. Height from ground ... ... ... ... ... ... ... ... ... ... ... ... ... ... A 16

36. Arc lamps to be guarded ... ... ... ... ... ... ... ... ... ... ... ... ... A 16

37. Connexion with earth of a three-wire system ... ... ... ... ... ... ... ... A 16





Regulation
Page
38. Connexion of other circuits with earth ... ... ... ... ... ... ... ... ... A
17
39. Special regulations as to extra high pressure ... ... ... ... ... ... ... ... A 17
40. Penalties for default ... ... ... ... ... ... ... ... ... ... ... ... ... A 19
41. Specific exemptions ... ... ... ... ... ... ... ... ... ... ... ... A 19
42. Exemption by Governor in Council ... ...
... ... ... ... ... ... ... A 20
43. Citation ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... A 20





ELECTRICITY SUPPLY REGULATIONS

(Cap. 103, section 3)

19 May 1911.1

DEFINITIONS

1. (1) In these regulations, unless the context otherwise requires

'consumer's wires' means any electric lines which are connected to the
service lines of the company at the company's meter 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 2
conductors through which a supply of energy is given, or between
any part of either conductor 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 volts,
the supply shall be deemed a low pressure supply;

(b)where the conditions of the supply are such that the pressure
exceeds 250 volts but does not exceed 650 volts, the supply
shall be deemed a medium pressure supply;

(c)where the conditions of the supply are such that the pressure
exceeds 650 volts but does not exceed 3,000 volts, 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 volts, 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.

(2) 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 any 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) the consumer's wires forming the connexions to motors,
or otherwise in connexion with the supply, shall be, as far as
practicable, completely 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
circuitbreakers 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 a 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 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 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 1 such switch be provided for each series
of arc 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 Electrical and Mechanical Services other-
wise 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 volts and the 3 wires of the system or
2 pairs of wires are brought into a consumer's premises, the supply
shall be given to 2 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. (1) The sectional area of the conductor in any electric
line other than low tension laid or erected in any street after
2 December 1921, shall not be less than that of a strand of 7 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.

(2) 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 volts, 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 1 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 Electrical and
Mechanical Services excessive, he 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 Electrical and Mechanical Services, 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 Electrical and Mechanical
Services, efficiently connected with earth.

9. In every case where a high pressure supply is transformed
for the purpose of supply to 1 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 Electrical and Mechanical Services.

PART 1

GENERAL

13. (1) Line conductors shall be copper, aluminium or such other
materials as may be approved by the Director of Electrical and
Mechanical Services.

(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 prescribed in
paragraph (14) or (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 support and forming part of the same overhead line.

(6) Line conductors shall be attached to suitable insulators carried
on supports of iron, steel, reinforced concrete or wood. 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
Wood .................................. 3

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 ]b. 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
Electrical and Mechanical Services.

(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 Electrical and
Mechanical Services.

(10) Every overhead line, including its supports and structural parts,
and electrical appliances and devices belonging to or connected
therewith, shall be regularly inspected and efficiently maintained.





(11) All materials used shall at the time of erection conform 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 11

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 40 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 160~'F. shall not, except with the consent of the
Director of Electrical and Mechanical Services, be less than 19 feet
across a public road or 17 feet in other positions. A height of 15 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 ,he ground at any part of the carriageway shall
not, except with the consent of the Director of Electrical and Mechanical
Services, 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,

(1) 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 Electrical and
Mechanical Services;

(11) 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 framework being insulated
from the pole but connected to the neutral conductor; or

(iii) other means approved by the Director of Electrical and
Mechanical Services;

(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 Electrical and
Mechanical Services.

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 70'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 160-F. shall not, except with the consent
of the Director of Electrical and Mechanical Services, be less than the
height hereunder stated

Voltages not exceeding 66,000 volts ......20 feet
Voltages exceeding 66,000 volts and not exceeding
110,000 volts ............................21 feet
Voltages exceeding 110,000 volts and not exceeding
165,000 volts ............................22 feet
Voltages exceeding 165,000 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 permanently and
efficiently connected with earth. For this purpose a continuous earth
wire shall be provided and connected with earth at 4 points in every
mile, the spacing between the points being as nearly equidis





tant 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 current required to operate the devices which make the line dead
or harmless to human beings or animals.

(17A) An overhead line carrying a voltage not exceeding 11,000
volts may be erected on wooden poles and any line so erected shall
comply with the requirements of

(a)specification No. 1320 of August 1946, issued by the British
Standards Institution, with such modification thereto as may
be for the time being in force. and

(b)these regulations, except in so far as they are inconsistent
with the requirements of paragraph (a).

(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 shal 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 Electrical and
Mechanical Services;

(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 5 feet; or

(iii) other means approved by the Director of Electrical and
Mechanical Services.

(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 precautions 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 2 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 Electrical and Mechanical Services. 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. Substations 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 15 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 1
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 substation
or street box shall not, without the consent of the Director of Electrical
and Mechanical Services, 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 2 or more
transformers.





CONSUMERS 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 of
the premises.

27. (1) A suitable safety fuse or other automatic circuitbreaker 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
scaled 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 $5.

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 5
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:

Provided that this paragraph shall not apply where the Director of
Electrical and Mechanical Services has certified that he is satisfied that
adequate provision exists for the periodical testing by or on behalf of
the consumer at intervals of not more than 5 years of such wires and
fittings belonging to him. used by him or under his control for the
purpose of ascertaining that they have not fallen into an unsafe
condition.

(1A) The Director of Electrical and Mechanical Services shall in
writing notify the company of the grant by him of any, certificate of
satisfaction under the proviso to paragraph (1).

(IB) Where, after the grant of a certificate of satisfaction under the
proviso to paragraph (1), the company becomes aware that a defect may
exist in the consumer's wires and fittings to which the certificate relates.
it shall in writing notify the Director of Electrical and Mechanical
Services to that effect.

(1C) Where the Director of Electrical and Mechanical Services
withdraws any certificate of satisfaction granted by him under the
proviso to paragraph (1), he shall in writing notify. the consumer and
the company of the withdrawal and shall specify, in that notice the
period within which the consumer's wires and fittings are to be tested.

(ID) The company shall test the consumer's wires and fittings
under paragraph (1) within the period specified under paragraph (1C)
and thereafter shall make periodical tests under paragraph (1) at
intervals of not more than 5 years.

(2) If the consumer does not give all due facilities for inspection
and testing under paragraph (1) within a reasonable time after the
service of a notice under that paragraph, the company shall forthwith
discontinue 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 5 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 on payment of a fee of $10. be
tested for the existence of leakage by the Director of Electrical and
Mechanical Services.

(2) Paragraph (1) shall be indorsed on every notice given under the
provisions of regulations 30 and 31(1).

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
5100 for every, such addition.

34. Every consumer upon whose premises any such addition is
found shall be liable to a penalty of SI 00 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. Are 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 feet from the ground.

36. All are 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 1 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 Electrical and Mechanical
Services 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 resulats 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 cementconcrete, or in strong metal
easing efficiently connected with earth.





(7)(a) Where extra high pressure mains for three-phase 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 2 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 1 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 2
December 192 1, to which an extra high pressure is to be given shall not
contain switches or apparatus other 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 Electrical and Mechanical Services shall be
entitled to enter at all times any of the generating stations or sub-
stations 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 connexion shall be made at on c 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 circuitbreaker 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 SI 00 for every such default
and in the case of continuing offence to a further penalty of $100 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 com-
pany'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, installa-
tions, apparatus and equipment in or upon any works, building or
other premises, by order specifying such works, building or prem-
ises, exempt the same from examination, inspection and testing
under these regulations.

CITATION

43. These regulations may be cited as the Electricity Supply
Regulations.
18 of 1911. Schedule. L.N. 236/72. L.N. 138/76. L.N. 76/82. L.N. 298/82. L.N. 44/84. Interpretation. L.N. 138/76. Pressure of supply to consumers. L.N. 76/82. L.N. 298/82. Introduction of three-wire system into consumer's premises. Minimum size of conductors. Insulation test of low pressure and medium pressure mains. Testing of insulation of all parts of high pressure circuit. Maintenance of insulation. L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. Circuit-breaker for high pressure mains, etc. L.N. 76/82. L.N. 298/82. Transformers. Connexion of transformers with earth. Protection from lightning. Report of accidents to Director of Electrical and Mechanical Services. L.N. 76/82. L.N. 298/82. Material of line conductors; L.N. 76/82. L.N. 298/82. strength of line conductors; minimum size of line conductor; line conductors to be inaccessible; line conductors crossing other lines; supports; L.N. 236/72. factors of safety of supports; L.N. 236/72. service lines; L.N. 76/82. L.N. 298/82. errection of line conductors at different voltages on same supports; L.N. 76/82. L.N. 298/82. inspection and maintenance of lines. materials used; factor of safety of line conductors; minimum height of conductors; L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. provision to prevent danger; L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. factor of safety of line conductors; minimum height of conductors; L.N. 76/82. L.N. 298/82. provision to prevent danger; overhead lines on wooden poles; L.N. 236/72. road-crossing, etc.; L.N. 76/82. L.N. 298/82. L.N 76/82. L.N. 298/82. danger notices; removal of obsolete lines. Other overhead lines. Construction 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. L.N. 76/82. L.N. 298/82. Sub-stations. Street boxes. Maximum power in case of underground sub-station, etc. L.N. 76/82. L.N. 298/82. Responsibility of company for lines, etc., on consumer's premises. Fire risks. Main fuses or circuit-breakers. Treatment of service lines and apparatus on consumer's premises. Transformers and high pressure apparatus to be inclosed in metal, etc. Connexion to consumer's premises not to be made where undue leakage would result. Discontinuance of supply on discovery of leakage on consumer's premises. L.N. 44/84. L.N. 44/84. L.N. 44/84. L.N. 44/84. L.N. 44/84. L.N. 44/84. Appeal to Director of Electrical and Mechanical Services. L.N. 76/82. L.N. 298/82. L.N. 44/84. L.N. 44/84. Penalty for making addition to electrical installation. Penalty on consumer for addition to electrical installation. Height from ground. Arc lamps to be guarded. Connexion with earth of a three-wire system. Connexion of other circuits with earth. L.N. 76/82. L.N. 298/82. Special regulations as to extra high pressure. L.N. 76/82. L.N. 298/82. Penalties for default. Specific exemptions. Exemption by Governor in Council. Citation.

18 of 1911. Schedule. L.N. 236/72. L.N. 138/76. L.N. 76/82. L.N. 298/82. L.N. 44/84. Interpretation. L.N. 138/76. Pressure of supply to consumers. L.N. 76/82. L.N. 298/82. Introduction of three-wire system into consumer's premises. Minimum size of conductors. Insulation test of low pressure and medium pressure mains. Testing of insulation of all parts of high pressure circuit. Maintenance of insulation. L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. Circuit-breaker for high pressure mains, etc. L.N. 76/82. L.N. 298/82. Transformers. Connexion of transformers with earth. Protection from lightning. Report of accidents to Director of Electrical and Mechanical Services. L.N. 76/82. L.N. 298/82. Material of line conductors; L.N. 76/82. L.N. 298/82. strength of line conductors; minimum size of line conductor; line conductors to be inaccessible; line conductors crossing other lines; supports; L.N. 236/72. factors of safety of supports; L.N. 236/72. service lines; L.N. 76/82. L.N. 298/82. errection of line conductors at different voltages on same supports; L.N. 76/82. L.N. 298/82. inspection and maintenance of lines. materials used; factor of safety of line conductors; minimum height of conductors; L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. provision to prevent danger; L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. L.N. 76/82. L.N. 298/82. factor of safety of line conductors; minimum height of conductors; L.N. 76/82. L.N. 298/82. provision to prevent danger; overhead lines on wooden poles; L.N. 236/72. road-crossing, etc.; L.N. 76/82. L.N. 298/82. L.N 76/82. L.N. 298/82. danger notices; removal of obsolete lines. Other overhead lines. Construction 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. L.N. 76/82. L.N. 298/82. Sub-stations. Street boxes. Maximum power in case of underground sub-station, etc. L.N. 76/82. L.N. 298/82. Responsibility of company for lines, etc., on consumer's premises. Fire risks. Main fuses or circuit-breakers. Treatment of service lines and apparatus on consumer's premises. Transformers and high pressure apparatus to be inclosed in metal, etc. Connexion to consumer's premises not to be made where undue leakage would result. Discontinuance of supply on discovery of leakage on consumer's premises. L.N. 44/84. L.N. 44/84. L.N. 44/84. L.N. 44/84. L.N. 44/84. L.N. 44/84. Appeal to Director of Electrical and Mechanical Services. L.N. 76/82. L.N. 298/82. L.N. 44/84. L.N. 44/84. Penalty for making addition to electrical installation. Penalty on consumer for addition to electrical installation. Height from ground. Arc lamps to be guarded. Connexion with earth of a three-wire system. Connexion of other circuits with earth. L.N. 76/82. L.N. 298/82. Special regulations as to extra high pressure. L.N. 76/82. L.N. 298/82. Penalties for default. Specific exemptions. Exemption by Governor in Council. Citation.

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