(1) An overhead line shall not cross over an existing building as far as possible and no building shall be constructed under an existing overhead line.
(2) Where an overhead line of voltage not exceeding 650 V 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, namely: –
(i) for any flat roof, open balcony, varandah roof and lean-to-roof, –
(a) when the line passes above the building, a vertical clearance of 2.5 metre from the highest point; and
(b) when the line passes adjacent to the building, a horizontal clearance of 1.2 metre from the nearest point;
(ii) for pitched roof, –
(a) when the line passes above the building, a vertical clearance of 2.5 metre immediately under the line; and
(b) when the line passes adjacent to the building, a horizontal clearance of 1.2 metre.
(3) Any conductor so situated as to have a clearance less than that specified in sub-regulation (2) shall be replaced with Aerial Bunched Cable and to be attached at suitable intervals to a bare earthed bearer wire having a breaking strength of not less than 350 kgf.
(4) The horizontal clearance shall be measured when the line is at a maximum deflection from the vertical due to wind pressure.
(5) The vertical and horizontal clearances shall be measured as per illustration provided in Schedule VIII C.
Explanation. – For the purposes of this regulation, the expression “building” shall be deemed to include any structure, whether permanent or temporary.