Subject:Building Electrification (BE/EDEC)
Syllabus:
Topic: IE Rule 1956
Unit:1
Definition of Voltage:
"Volt"
means a unit of electromotive force and is the electric pressure which, when
steadily pplied to a conductor, the resistance of which is one ohm, will produce
a current of one ampere,
"Voltage" means the difference of electrical
potential measured in volts between any two conductors or between any part of
either conductor and the earth as measured by a suitable voltmeter and is said
to be,
"Low" where the voltage does not exceed 250 volts
under normal conditions subject, however,the percentage variation allowed by
these rules;
"Medium"
where the voltage does not exceed 650 volts under normal conditions subject,
however, the percentage variation allowed by these rules,
"High" where the voltage does not exceed 33,000
volts under normal conditions subject, however, se the percentage variation
allowed by these rules,
"Extra
High" where the voltage exceeds 33,000 volts under normal conditions
subject, however,the percentage variation allowed by these rules;
Rule- 30
Service lines and
apparatus on consumers premises.
(1) The supplier shall ensure that all electric supply
lines, wires, fittings and apparatus belonging to him or under his control
which are on a consumer's premises are in a safe condition and in all respects
fit for supplying energy, and the supplier shall take due precautions to avoid
danger arising on such premises from such supply lines, wires, fittings and
apparatus.
(2) Service line placed by the supplier on the premises of a
consumer which are underground or which are accessible shall be so insulated
and protected by the supplier as to be secured under all ordinary
conditions against electrical, mechanical, chemical or other injury to the
insulation
(3) The consumer shall also, as far as circumstances permit,
take precautions for the safe custody of the equipment on his premises
belonging to the supplier
(4) The consumer shall also ensure that the installation
under his control is maintained in a safe condition
Rule-31. Cut-out consumer's premises.
(1)
The supplier shall provide a suitable cut-out in
each conductor of every line other than an earthed or earthed neutral conductor
or the earthed external conductor of concentire cables within a consumer's
premises in an accessible position. Such cut-out shall be contained with
adequately enclosed fireproof receptacle.
Where more than one consumer is
supplied through a common service line, each such consumer shall be provided
with an independent cut out at the point of junction to the common service.
(2) The owner of every electric supply line, other than the
earthed or neutral conductor ofconcentric cable, shall protect it by suitable
cut-out.
Rule-32. Identification of earthed and earthed neutral
conductor and position of switches and cut-outs therein.
Where the conductors include an earthed conductor of a two
wire system or an earthed neutral conductor of a multi-wire system or a
conductor which is to be connected thereto, the following conditions shall be
complied with.
(1) An indication of a permanent nature shall be provided by
the owner of the earthed or earthed neutral conductor, or the conductor which
is to be connected thereto, to enable such conductor to be distinguised from
any live conductor Such indication shall be provided.
(a) Where the earthed or earthed neutral conductor is the
property of the supplier, at or near the point of commencement of supply.
(b) Where a conductor forming part of a consumer's system is
to be connected to the supplier's earthed or earthed neutral conductor, at the
point where such connection is to be made
(c) In all other cases, at a point corresponding to the
point of commencement of supply or at such other points as may be approved by
an Inspector.
(2) No cut-out, link
or switch other than a linked switch arranged to operate simultaneously on the
earthed or earthed neutral conductor and live conductors shall be inserted or
remain inserted in any earthed or earthed neutral conductor in a two-wire
system or in any earthed or earthed neutral conductor of multi-wire system or
in any conductor connected thereto with the following exceptions:
(a) A link for testing purposes, or
(b) A switch for use in controlling a generator or transformer.
Rule-46 Periodical
inspection and testing of consumer's installation.
(1). (a) Where an installation is already connected to the supply system of
the supplier every such installation shall periodically inspected and tested at
intervals not exceeding five years either by the Inspector or by the
supplier as may be directed by State Government.
(b) Where the supplier is directed by the Central or the
State Government as the case may be, inspect and test the installation, he shall report on
the condition of the installation to the consumer concerned in a form approved
by the Inspector and shall submit a copy of such report to the Inspector.
(2). (a) The fees for such inspection and test shall be determined
by the Central or State Government, as the case may be, in the case of such
class of consumers and shall be payable by the consumers in advance.
(b) In the event of the failure of any consumer to pay the
fees on or before the date specified in the fee notice, supply to the
installation of such consumer shall be liable to be disconnected under the
direction of the Inspector. Such disconnection, however, shall not be made by
the supplier, without giving to the consumer seven clear days' notice in
writing of his intention to do so.
(a) Notwithstanding
the provisions of this rule, the consumer shall at all times be solely
responsible for the maintenance of his installation in each conditions as to be
free from danger.
Rule- 47 Testing a
consumer's installation.
(1) Upon receipt of an application for a new or additional
supply of energy and before connecting the supply or reconnecting the same
after a period of six months, the supplier shall inspect and test the
applicant's installation The supplier shall maintain a record of test results,
obtained at each supply point to a consumer, in a form to be approved by the
inspector
(2) If as a result of such inspection and test the supplier
is satisfied that the installation is likely to constitute danger he shall
serve on the applicant a notice in writing requiring him to make such
modifications as are necessary to render the installation safe The supplier
may refuse to connect or reconnect the supply until the required modifications have
been completed and he has been notified by the applicant
Rule- 54. Declared Voltage of Supply to Consumer.
Except with the written consent of the consumer or the
previous sanction of the State Government a supplier shall not permit the
voltage at the point of commencement of supply as defined under rule 58 to vary
from the declared voltage by more than 5 per cent in the case of low or medium
voltage or by more than 12.5 per cent in the case of high or extra high
voltage.
Rule- 55. Declared Frequency of Supply to Consumer.
Except with the
written consent of the
consumer or with the previous sanction of the State
Government a supplier shall not permit the frequency of an alternating current
supply to vary from the declared frequency by more than 3 per cent.
Rule -56 Sealing of Meters and Cut-outs.
(1) A supplier may affix one or more seals to any cut- out
and to any meter, maximum demand indicator, or other apparatus placed upon a
consumer's premises in accordance with section 26, and no person other than the
supplier shall break any such seal.
(2) The consumer
shall use all reasonable means in his power to ensure that no such seal is broken
otherwise than by the supplier
(3) The word "supplier shall for the purpose of this
rule include a State Governmen when any meter, maximum demand indicator or
other apparatus is placed upon a consumer's premises by such Government.
Rule- 77. Clearances above ground of the lowest
Conductor.
1) No conductor of an overhead line, including service
lines, erected across a street shall at any any part thereof be at
height less than:
(a) for low or medium voltage lines --
5.8 m (19 ft)
(b) for high voltage line -6 m (20 ft)
(2) No conductor of an overhead line including service lines
erected along any street shall at any
part thereof be at a height less than:
(a) for low, medium and high voltage lines ----- 5.49 m (18
ft)
(b) for high voltage lines ------- 5.8 m (19 ft)
(3) No conductor of an overhead line including service
lines, erected elsewhere than along or across any street shall be at a height
less than
(a) for low medium, and high voltage lines up to and
including 11,000 volts if bare -----à
4.57 m (15 ft)
(b) for low, medium and high voltage lines up to and including
11,000 volts if insulated --à
3.96 m (13 ft)
(c) for high voltage lines above 11,000 volts ----à 5.18 m (17 ft)
(4) For extra high voltage lines the clearance above ground
shall not be less than 5.18 m (17 ft) plus 0.3 m (1 ft) for every 33,000 volts.
Provided that the minimum clearance along or across any
street shall not be less that 6 m (20 ft).
Rule- 79. Clearances from buildings of low and medium
voltage lines and service lines.
(1)Where a low or medium voltage overhead line passes above
or adjacent to or terminates on any building, the following minimum clearances
from any accessible point, on the basis of maximum sag, shall be observed:
(a) For any flat roof, open balcony, verandah roof and lean
to roof-
✓✓ (i) when the line
passes above the building, a vertical clearance of 2.44 m (8 ft) from the highest
point, and
✓✓ (ii) when the
line passes adjacent to the building, a horizontal clearance of 1.22 m (4 ft)
from the nearest point, and
(b) for pitched roof
✓✓(i) when the line
passes above the building, a vertical clearance of 2 44 m (8 ft) immediately under
the lines, and
✓✓(ii) When the
line passes adjacent to the building, a horizontal clearance of 1 .22 m (4 ft)
(2) Any conductor so situated as to have a clearance less
than that specified in sub-rule (1) shall be adequately insulated and shall be
attached by means of metal clips at suitable intervals to a bare earthed bearer
wire having breaking strength of not less than 317.5 kg. (700 lbs).
(3) The horizontal clearance shall be measured when the line
is at maximum deflection from the vertical due to wind pressure.
Rule- 87. Lines
crossing or approaching each other.
(1) Where an overhead
line crosses or is in proximity to any telecommunication line, the owner of the
overhead line shall protect it in a manner laid down in the Code of Practice of
the Power and Telecommunication Coordination Committee
(2) When it is intended to erect a telecommunication line
which will cross or be in proximity to an overhead line, the person proposing
to erect such telecommunication line shall give notice in writing of his
intention to the owner of the overhead line and the owner of the overhead line
shall, with in twenty one days of receiving such notice, provide the protection
referred to in sub-rule (1).
(3) Where an overhead line crosses or is in proximity to an
overhead line belonging another person,
the owner of the line which was last erected shall so protect it as to guard
against the possibility of its coming into contact with the other overhead
line.
(4) A person erecting or proposing to erect an overhead line
may require the owner of the other overhead line to provide the protection
referred to in sub-rule (3) within twenty one days of the receipt of the notice
on that behalf.
(5) In all cases
referred to in the preceding sub-rules, the expenses of making the guarding arrangement
shall be borne by the person whose line was last erected.
(6) Where two lines
cross, the crossing shall be made as nearly at right angles as the nature of
the case admits.
(7) The guarding arrangement shall ordinarily be carried out
by the owner of the supports on which it is made and he shall be responsible
for its efficient maintenance.
(8) All work required to be done by or under this rule shall
be carried out to the satisfaction of Inspector
Rule - 88. Guarding.
(1) Where guarding is required under these rules, the
provisions of sub-rules (2) to (4) shall apply.
(2) Every guard wire
shall be connected with earth at each point at which electrical continuity is
broken.
(3) Every guard wire shall have an actual breaking strength
of not less than 635 kg (1.400 lbs) and if made of iron or steel, shall be
galvanised.
(4) Every guard wire of cross-connected system of guard
wires, shall have sufficient current carrying capacity to ensure the rendering
dead, without risk of fusing of the guard wire or wires till the contact of any
line wire has been removed.
(5) Lines crossing trolley wires, in the case of a crossing
over a trolley wire the guarding shall fulfil the following conditions, namely:
(a) Where there is only one trolley wire, two guard-wires
shall be erected as in diagram A.
(b) Where there are two trolley wires and the distance
between them does not exceed 0.381 tre (15 inches), two guard wires shall be
erected as in diagram B.
( c ) Where there are two trolley wires and the
distance between them exceeds 0.381 metre (15) inches), but does not exceed
1.219 metres (48 inches), three guard wires shall be erected as in diagram C
(d) Where there are
two trolley wires and the distance between them exceeds 1.219 metres (48 ches)
each trolley wire, shall be separately guarded as in diagram D
(e) The rise of trolley boom shall be so limited that if the
trolley leaves the trolley wire, it shall not foul the guard wire; and
(f) Where a telegraph line is liable to fall or be blown
down upon an arm, stay wire or span wine and so slide down upon a trolley wire,
guard hooks shall be provided to prevent such sliding.
Source : EDEC by J. B. Gupta
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