IS 5424:1969 is obsolete and has been replaced with the recent IS 15652:2006.
With the recent update, the standards come with greater electrical safety capacities ensuring that your workplace is safe.
Also, you need to cautiously note that if you are still using the IS 5424:1969 then you won’t be passing through any safety audits.
If you fail the electrical safety audit, your company would be closed down too.
For general rubber flooring purposes, you can always choose IS 15652:1969.
If you expect a working voltage resistance as per the updated standards, then this will not be a suitable choice for your workplace with live equipment.