OK, now I know what you specifically want, I think I can help. I used to design and test equipment using the standards you are looking for, from either IEC, ISO, or Underwriters Laboratory (UL) in the USA.
They are voluminous standards, which you normally have to pay for, although they should be available from some libraries. They are not for the faint of heart, trying to understand them can be a daunting task.
What you are looking for is info on creepage and clearance (which applies to pcb tracks, connectors, screws, in fact anything where there is or could be a potential difference), insulation, earthing, and subjects like finger testing, i.e., does a finger poked in through a ventilation hole allow access to a high voltage.
Look the subject up on the web, you are likely to find enough of what you need to know (tables of creepage and clearance versus voltage)without having to work your way through these standards.
Hope that helps,
cheers,
Richard
