Dear friend,
I am unable to understand the reason or the context behind your question.
No of employees is a requirement based on various factors like the average volume of business transaction per day, the floor space of the establishment, the nature of the services rendered to the customers and the like. Hence it is a matter of pure business requirement left exclusively to the discretion of an individual employer.
Even if there is licensing/ registration provision, the number criterion would always be there for the purpose of fee to be collected only. That's why you will find the fee structure being fixed as " upto certain no"' in slabs and thereafter finally "beyond a certain number" only and not being limited to an exact number of employees.
Therefore, so far as I am aware, no State S&E Act puts a ceiling on the no of employees.