Interest on pre construction loan sec 24(b)

Please do the needful help by giving your inputs on below mentioned query-:

Query-: As per Section 24(b) interest on preconstruction period loan is allowed in five equal installments for self-occupied – max Rs.150000 and For let out no limit.

But is it over and above exemption limit on interest paid 1.5 lakh every year? or is it seperate from 1.5 lakh interest every year?

 Please advice!!!