Contractor

Means a natural person, other than a person who is employed by the Commonwealth or by a Commonwealth authority, who:

(a) performs work on Commonwealth premises in connection with an undertaking being carried on by the Commonwealth, being work that is being performed, or that is connected with work that is being performed, under a contract entered into between the Commonwealth and that person or any other person (whether a natural person or not)

(b) performs work on Commonwealth premises in connection with an undertaking being carried on by a Commonwealth authority, being work that is being performed, or that is connected with work that is being performed, under a contract entered into between the authority and that person or any other person (whether a natural person or not).