I am trying to understand why there is a difference between the two.
I know that TN-C-S has PME along its lenght to an installation, so Neutral and Earth are the same. The Neutral and Earth are separated at the installation, the Earth then provides a 'Faraday cage' for protection within the installation.
1) Why can't TT be treated the same way at the installation? The supply transformer as I understand it, has its Neutral Earthed at the transformer. The Neutral could be split at the entry to the installation to give the same effect as the TN-C-S.
2) If the Neutral is Earthed at the transformer why can't it be Earthed a the installation so any volt drop along the supply cable is nulled out?
I know that TN-C-S has PME along its lenght to an installation, so Neutral and Earth are the same. The Neutral and Earth are separated at the installation, the Earth then provides a 'Faraday cage' for protection within the installation.
1) Why can't TT be treated the same way at the installation? The supply transformer as I understand it, has its Neutral Earthed at the transformer. The Neutral could be split at the entry to the installation to give the same effect as the TN-C-S.
2) If the Neutral is Earthed at the transformer why can't it be Earthed a the installation so any volt drop along the supply cable is nulled out?