(1)The general illumination over those interior parts of a factory where persons are regularly employed shall be not less than 3 feet candle measured in the horizontal plane at a level of 3 feet above the floor:Provided that in any such parts in which the mounting height of the light source for general illumination necessarily exceeds 25 feet measured from the floor or where the structure of the room or the position or construction of the fixed machinery or plant prevents the uniform attainment of this standard, the general illumination at the said level shall be not less than I foot candle and where work is actually being done the illumination shall not be less than 3 feet candles.
