B
bumcrack
Hello!
I am putting in a 4Kw ground mount scheme with a TL inverter and I can't make sense of the DTI earthing tree. Framework to be of unistrut construction, and effectivley insulated from tera firma by concrete.
The main incomer is PME, and if I follow the DTI tree, the end result is that I bond the array frame to a local earth spike. It's the footnote to this in the DTI tree " do not take PME out of equipotential zone " that concerns me.
My intention is to mount the inverter onto metalwork on the underside of the array. Cable wise, 3 core SWA to come from below ground to AC isolator, then from isolator to inverter with 3 core SY type flex. I will use core 3 of the SWA and SY as earth all the way to the inverter earth terminal.
The inverter hangs on a metal backplate, bolted to the array frame. In doing this, am I effectively taking the PME out of the equipotential zone?
Surely there will be continuity from the inverter earth terminal to the inverter chassis/metalwork,backplate, and this will extend the PME to the array frame?
My only solution would be to mount the inverter backplate on insulators, and then bond the framework down to an earth spike.
Does that make sense?
cheers...
I am putting in a 4Kw ground mount scheme with a TL inverter and I can't make sense of the DTI earthing tree. Framework to be of unistrut construction, and effectivley insulated from tera firma by concrete.
The main incomer is PME, and if I follow the DTI tree, the end result is that I bond the array frame to a local earth spike. It's the footnote to this in the DTI tree " do not take PME out of equipotential zone " that concerns me.
My intention is to mount the inverter onto metalwork on the underside of the array. Cable wise, 3 core SWA to come from below ground to AC isolator, then from isolator to inverter with 3 core SY type flex. I will use core 3 of the SWA and SY as earth all the way to the inverter earth terminal.
The inverter hangs on a metal backplate, bolted to the array frame. In doing this, am I effectively taking the PME out of the equipotential zone?
Surely there will be continuity from the inverter earth terminal to the inverter chassis/metalwork,backplate, and this will extend the PME to the array frame?
My only solution would be to mount the inverter backplate on insulators, and then bond the framework down to an earth spike.
Does that make sense?
cheers...