Dimapur, Jan. 18 (EMN): The chief electrical inspector has informed about the safety rules of the electrical accidents under the Indian Electricity Rules (IER), 1956 on Jan. 17.
The notification letter appended by the chief electrical inspector, Er. I.V Chishi, has been issued in the interest of the public for their information and safety and to bring to the notice of the Electrical Inspectorate of any breach in the rules in order to prevent any electrical accident due to the electricity lines. The IER, 1956 are as follows:-
1. IER, 1956 (79): Clearances from buildings of low and medium voltage lines and service lines (11,000 volts and below):
(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 2.5 metres from the highest point and
(ii) When the line passes adjacent to the building a horizontal clearance of 1.2 metres from the nearest point, and
(b) For pitched roof –
(i) When the line passes above the building a vertical clearance of 2.5 metres immediately under the lines, and
(ii) When the line passes adjacent to the building a horizontal clearance of 1.2 metres.
(2) The horizontal clearance shall be measured when the line is at a maximum deflection from the vertical due to wind pressure.
2. IER, 1956 (80): Clearances from buildings of high and extra-high voltage lines (11,000 volts and above):
(1) 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 up to and including 33,000 volts – 3.7 metres
(b) For extra-high voltage lines – 3.7 metres plus 0.30 metres for every additional 33,000 volts or part thereof.
(2) The horizontal clearance between the near est conductor and any part of such building shall, on the basis of maximum deflection due to wind pressure, be not less than:
(a) For high voltage lines upto and including 11,000 volts – 1.2 metres
(b) For high voltage lines above 11,000 volts
upto and including 33,000 volts – 2.0 metres
(c) For extra-high voltage lines – 2.0 metres plus 0.3 metres for every additional 33,000 volts for part thereof.
