Metals are exposed on the sides of the SSOP30 package for high-voltage IPDs. What voltage potential do they have?

The metals exposed on the sides of the SSOP30 package

The metals exposed on the sides of the SSOP30 package have the voltage potential shown below.

Also see the "High voltage intelligent power device application note“ for circuit diagrams, operations, and usage of high-voltage IPDs. Keep it at hand for reference.