Section 2(1)(a) in The Building and other Construction Workers (Regulation of Employment and Conditions of Service) Act, 1996
(a)"appropriate Government" means-(i)in relation to an establishment (which employs building workers either directly or through a contractor) in respect of which the appropriate Government under the Industrial Disputes Act, 1947, is the Central Government, the Central Government;(ii)in relation to any such establishment, being a public sector undertaking, as the Central Government may by notification specify which employs building workers either directly or through a contractor, the Central Government;