(a) When any plumbing is to be hidden from view by the permanent placement of parts of the building, the person, firm or corporation installing the plumbing shall notify the Plumbing Inspector and such equipment shall not be concealed until it has been inspected, approved or authorized by the Plumbing Inspector or until 24 hours, exclusive of Saturdays, Sundays and holidays, shall have elapsed from the time of such notification. On large installations, where the concealment of plumbing proceeds continuously, the person, firm or corporation installing the plumbing shall give the Plumbing Inspector due notice and inspections shall be made periodically during the progress of the work.
(b) The Plumbing Inspector shall have the authority to require owners or contractors to open such work which, in any manner, conceals plumbing that has been closed without his or her knowledge or permission, and in no case shall the Inspector issue a certificate of approval until satisfied that the work is in accordance with the provisions of this article. The Inspector shall also have the right to refuse to issue a certificate of approval on any plumbing, that is concealed in such manner that it cannot be fully determined that it has been done in accordance with this article.