Power Modules PM240

1. TN line system :-
A TN line system transfers the PE protective conductor to the installed plant or system using a cable. Generally, in a TN line system the neutral point is grounded. There are versions of a TN system with a grounded line conductor, e.g. with grounded L1. A TN line system can transfer the neutral conductor N and the PE protective conductor either separately or combined.

2. TT line system:-
In a TT line system, the transformer grounding and the installation grounding are independent of one another. There are TT line supplies where the neutral conductor N is either transferred – or not.

3. IT system:-
In an IT line system, all of the conductors are insulated with respect to the PE protective conductor – or connected to the PE protective conductor through an impedance. There are IT systems with and without transfer of the neutral conductor N.