Section 1(4)(ii) in The Tamil Nadu Building and Construction Workers (Conditions of Employment and Miscellaneous Provisions) Act, 1984
(ii)engaged in the work of building construction or work of engineering construction which is a hazardous work and in any part of which any such operation of a hazardous nature is being carried on or is ordinarily so carried on, irrespective of the number of workers being employed therein or is ordinarily so employed: