(a) Notwithstanding the provisions of sub regulation (1), no employer or user of machinery needs to designate a person in terms of that sub regulation in respect of any elevator, goods elevator, escalator or electrical installation in any shop or office or on, or in, any domestic premises, any domestic appliance used as such, any machinery used in connection with building work, any vehicle or earth-moving plant or any refrigeration, cooling, air-conditioning or freezing plant inspected and maintained by a duly qualified person in pursuance of an agreement entered into by any such employer or user of machinery.
(b) The chief inspector may by written notice direct any employer or user of machinery referred to in paragraph (a) to designate within the period specified in the notice a person holding the qualifications so specified in terms of sub regulation (1).