Difference in cover for fire reistance in IS456 and IS1642

Project:www.sefindia.org
Component:Code
Category:feature request
Priority:critical
Assigned:kshijina
Status:active
Description

Clear cover required for fire resistance in structural elements.

As per IS456-2000, nominal cover for reinf. in fully exposed column is 40mm. for 2hrs fire rating.
whereas, as per IS1642-1989, nominal cover for reinf. for the same condition is 35mm.
Similarly covers specified for all structural elements differs in both codes.
Please guide.