Section 49

any work under section 45(1), (2), (4) or (5);

any work required to be carried out by a management corporation —

by a notice served on it by a public authority or statutory board; or

by an order of the Commissioner;

any work referred to in section 48(1)(b), (c) or (d);

any work necessary to repair or renew any pipes, wires, cables or ducts referred to in section 57(a)(ii); or

any investigation or work required to be carried out by a management corporation under any order made by a Board under section 103,the management corporation may, by its employees or agents, enter upon any lot or part of the parcel for the purpose of investigating or carrying out the work in the case of an emergency, at any time, or, in any other case, at any reasonable time after giving notice to any occupier of that lot or part of the parcel.