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 2.5 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)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 at suitable intervals to a bare earthed bearer wire having a breaking strength of not less than 350 kg. (700 lbs.)(3)The horizontal clearance shall be measured when the line is at a maximum deflection from the vertical due to wind pressure.[ Explanation .-For the purpose of this rule, expression "building" shall be deemed to include any structure, whether permanent or temporary.]
