Hi All 

I'm currently working on a project where a site is supplied via a private wire from a nearby power station unfortunately this connection has no spare capacity for the project as such we have approached the DNO for a a second connection to site one mandatory requirement they have made is that the earthing systems should be segregated, I struggle to understand how this can be achieved has anyone else been in this situation and how was it demonstrated that the earthing systems are segregated?

I have worked on sites that have two separate supplies (one from a docks ring and one from the DNO one at 11kV and one at 33kV) however we did have to  demonstrate any segregation of earthing .

Mark