Excise exemption for non-ssi domestic turnover

There is a website that states that
1. Non-SSI manufacturing units are exempted from Excise registration if their domestic turnover is less than 50Lacks.
2. SSI manufacturing units are exempted from Excise registration if their domestic turnover is less than 100Lacks.
Export turnover will not be counted for Excise limit of 150 lacks.

I am able to find govt. websites that clearly talk about SSI (Non Cenvat) scheme where an SSI unit has option to 'not' register for Excise till his domestic (home) turnover is less then 100Lacks, irrespective of export turnover. Some websites also quote Notification number 8/99 and 9/99 for this.

But I am not able to find any govt. website that gives details (notification number) about excise exemption for Non-SSI for domestic turnover of less then 50Lacks.

Can someone please give their valuable advise on this matter (with circular / notification details if possible).

Sincerely thanking you in advance!