Common HV and LV grounding

[radug]

Hello,

I am currently designing a highway electrical supply with HV and LV grounds. I intend to make a common ground for both HV and LV. While examining CENELEC HD 637 S1, I have found it says that if LV loads are inside the area of HV ground, all grounds must be joined and the requisites for common grounding are automatically fulfilled.

Has anyone an explanation for this? Because I find the requisites hard to fulfill.

Thanks.

 

[Marmite]

I have no knowledge of that particular standard or its requirements, but as a general comment, if you had LV loads inside the HV ground you would need to bond the grounds together to prevent dangerous touch potentials between metalwork and plant connected to each respective grounding system in the event of a fault on the other system.
Regards
Marmite

 

[7anoter4]

See also thread238-222192
Regards