Sprinkler systems, standpipe systems, fire alarm systems and any other fire protection or extinguishing systems or appliances which have been installed in compliance with any permit or order, or in accordance to law or ordinance, shall be maintained in operative condition at all times, and no owner or occupant shall reduce the effectiveness of the protection so required, except in reducing or discontinuing the protection where necessary to make tests, repairs, alterations or additions. The Fire Prevention Bureau shall be notified before any such tests, repairs, alterations or additions are commenced and work is to be continuous until completed.