Taking on your advice, and speaking to an electrician, a retired one in this case, he said they use to drive 3 spikes into the ground, a few meters apart, and weld a connection between them, so that the earth might match the live, and have a specific ohm readings, so that the fuse will work properly. He used to practice he.s craft many years ago, so not sure if his knowledge it.s still valid with this new fuses.
Also said that the large metal structure from the photo has a very solid grounding structure going on, so I might use this. That is a high voltage system, and I.m not sure if it goes well with 220v systems.
That.s the best I could find today, as we have a holiday going on, but will check with the up to date electrician as well.
Will fix this earthing problem asap.

Meanwhile, I,ll do some research about this gearing inputs I need to make.

Thank you.