I do not think that a legal commentary or case law is required to establish it. A factory where a manufacturing activity is carried out is covered under the Factories Act, a mine is covered under the Mines Act, or a plantation is covered under the Plantation Labour Act. All these Acts speak about the registration of the establishment and provide for the health, safety, and welfare of the people employed therein.
An establishment which will not come under these Acts, like an administrative office, sales office, or depot where only support functions are carried out, should also be registered and follow some guidelines for the health, safety, and welfare of the people employed in such offices. Obviously, an administrative office situated within the boundaries of the factory, mine, or plantation will be under the Factories Act, Mines Act, or Plantation Act, as the case may be. Those outside the boundaries or situated away from the factory, mine, or plantation will not be covered by the respective Act, and for that, the State Act meant for shops and commercial establishments will apply.
Regards,
Madhu.T.K