5. Every employee of the Board, shall, except the following, be a member of the Fund and be subject in all respects to these Rules:
an employee who is above the age of 50 years when he enters the service of the Board;
a daily-rated employee;
an employee employed in a temporary post;
an employee on a contract allowing an addition by way of gratuity to his basic salary or an employee on an inclusive salary:
Provided that such an employee may be specifically authorised by the Board to join the Fund on his conversion to the normal salary scale and conditions of service;
an employee who is already a member of the Municipal Provident Fund established under the Municipal Ordinance (Cap. 133, 1936 Ed.); and
an employee on secondment from the Government or any other statutory body.