I am quite unable to understand the context in which you've raised this query. The term " Leave " in employment parlance would mean the leave of absence for an employee to be away from work/ the place of work due to certain personal reasons. A suspended employee is already away from both his work and place of work. In such a situation, how the necessity for taking leave would arise? If there is a condition in the suspension orders that the suspended employee should not move out of the headquarters during the entire period of suspension without prior permission, for any personal reason for moving out of the headquarters, he can apply for permission. If the enquiry date coincides with such an occasion, he can seek adjournment. So, the question of taking leave by a suspended employee does not arise at all.
I am quite agree with the opinion provided by Mr. Umakanthan on above subject matter. You need to refere your Standing order what provision is made there under while one is put under suspenssion.
The workman can seek the consent of management for permission for leaving and also not to fix any hearing or proceeding of inquiry during the period of absence.
Your query is misconceived. As per Standing Orders, you are paid subsistence allowance at applicable rates during the period of your suspension pending enquiry. If you remain absent without any permission or prior intimation on the scheduled dates of enquiry, you are liable for pro-rata reduction in the subsistence allowance .