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 (14 of 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;