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THE INDIAN ELECTRICITY RULES, 1956


(AS AMENDED UPTO 25TH NOV., 2000)

UNDER SECTION 37 OF THE INDIAN ELECTRICITY ACT, 1910 (9 OF 1910)

REGULATING THE GENERATION, TRANSMISSION, SUPPLY AND USE OF ELECTRICAL ENERGY AND GENERALLY TO CARRY OUT THE PURPOSES AND OBJECTS OF THE SAID ACT

[1] Clearance above Ground of the Lowest Conductor: (Ref. Indian Electricity Rules, 1956, No. 77)
(i) No conductor of an overhead line, including service lines erected across a street shall at any part thereof, be at a height less than:
(a) For low and medium voltage line… 5.791 Meters (19ft.)
(b) For high voltage lines - 6.096 meters (20ft.).
(ii) 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 and medium voltage lines – 5.486 meters (18ft.)
(b) For high voltage lines - 5.791 meters (19ft.).
(iii) No conductor of an overhead line including service lines erected elsewhere than along or across any street shall at a height less than:
(a) For low, medium and high voltage lines up to and including 11,000 volts, if bare - 4.572 meters. (15ft.)
(b) For low, medium and high voltage lines up to and including 11,000 volts, if insulated - 3.963 meters. (13ft.)
(c) For high voltage lines above 11,000 valts-5.182 meters (17ft.)
(iv) For extra high voltage lines, the clearance above ground shall not be less than 5.182 meters (17 feet) plus 0.305 meter (1ft.) for every 33,000 volts or part thereof by which the voltage of the line exceeds 33,000 volts: Provided that the minimum clearance along or across any street shall not be less than 6.096 meters. (20ft.).

[2] Clearance from buildings of low and medium voltage lines and service lines: (Ref: I.E. Rule No.79)
(A) 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 the observed:
(a) For any flat roof, open balcony, verandah and lean to roof:
(i) When the line passes above the building, a vertical clearance of 2.439 meters (8ft.) from the highest point; and
(ii) When the line passes adjacent to the building, a horizontal clearance of 1.219 meters (4 feet) from the nearest point.
(b) For pitched roof:
(i) When the line passes above the building, a vertical clearance of 2.439 meters (8ft.) immediately under the lines, and
(ii) When the line passes adjacent to the building, a horizontal clearance of 1.219 meters (4ft.) from the nearest point.

(B) Any conductor so situated as to have a clearance less than that specified in Sub-Rule (A) shall be
adequately insulated and shall be attached by means of metal clips at suitable intervals to a bare earthed
bearer wire having a breaking strength of not less than 317.51 kg. (700 lbs.) (Equi. to G.I. wire 10 S.W.G.)

(C) The horizontal clearance shall be measured when the line is at a maximum deflection from the vertical
due to wind pressure.

[3] Clearances from buildings of High and Extra-high voltage Lines: (Ref. I.E. Rule No.80)
(A) Where a high or extra-high voltage overhead line passes above or adjacent to any building or part of a building, it shall have, on the basis of maximum sag, a vertical clearance above the highest part of the building immediately under such line, of not less than :
(a) For high voltage lines 3,658 meters (12 ft.) upto and including 33,000 volts.
(b) For extra-high voltage 3,658 meters (12 ft.) lines. plus 0.305 meters (1 foot) for every additional 33,000 volts or part thereof.

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