10.24. A swimming pool must be designed in such a way as not to be accessible to the public outside opening hours. The enclosure used for that purpose must have a minimum height of 1.20 m and have no fixture, projection or opening enabling it to be climbed. It may, however, have openings provided that a spherical object of 100 mm in diameter cannot pass through them or, in the case of a chain link fence, that each link measures no more than 38 mm.