Originally posted by: dimcha
Thank you very much for this answer.
I understand that the frames can become live under fault conditions and this requires bonding of the system.
Are they likley to be come live ? - class 2 panels and class 2 cabling coupled with a transformer invertor or an an invertor providing the equivalent seperation would suggest you would be wiser to leave the frame floating
On the other hand, I am struggling to understand why it's not appropriate earthing as long as the frames are straight buried into the ground.
The frames into the ground will probably give you adequate lightning protection - earthing them to the Main earthing terminal is another matter
I reckon that both LV and HV earthing bars should be joined together in the switchhouse.
Steady - you need to know what HV earthing arrangements are in place - I wouldn't assume that they should be connected without checking the relevant HV and LV impedances
In terms of the bonding conductor between frames, what variables dictate the required cross section area of this conductor?
Well code copmpliance would be a start (normally a minimum of 6/10mm2 but possibly up to 25mm2 or even larger. The LPS issue may well drive them up to minimum of 70mm2 - but see my initial comment
thank you in advance.
Let the wind blow you, across a big floor.