The appropriate Government may, in the case of an emergency, direct, by notification in the official Gazette, that subject to such conditions and restrictions, if any, and for such period or periods, as may be specified in the notification, all or any of the provisions of this Act or the rules made thereunder shall not apply to any establishment or class of establishments or any class of contractors. -The appropriate Government may, in the case of an emergency, direct, by notification in the official Gazette, that subject to such conditions and restrictions, if any, and for such period or periods, as may be specified in the notification, all or any of the provisions of this Act or the rules made thereunder shall not apply to any establishment or class of establishments or any class of contractors.