TN-S repeated grounding?
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In the TN-S system, the neutral wire N of the transformer is connected to the PE wire. The cable entering the workshop is a five-core cable. Can the PE wire at the entrance to the workshop be grounded repeatedly? (Isopotential connection) I would appreciate some advice from those who are more experienced. Thanks first! ! !
At the entrance to the workshop, the PE wire can be grounded repeatedly. . The main requirement for TN-S is the separation of neutral and ground, with no restriction on repeated grounding. Of course, the neutral wire should not be grounded again in the workshop
In the TN-S system, it is a power supply system in which the working neutral wire N and the dedicated protection wire PE are strictly separated. In your case, the neutral wire N at the transformer’s center point is connected to the PE wire. The cable entering the workshop is a five-core cable; the PE wire at the point of entry can be grounded repeatedly.
Repeated grounding refers to the practice of performing it on the PE wire, rather than on the working neutral wire. Repeated grounding can be carried out on the PE wire at the entrance to the workshop; after entering the workshop, the wires coming out of the low-voltage distribution cabinet have the neutral wire and the PE wire strictly separated from each other – they must not be mixed together. A leakage circuit breaker is installed in the wiring, and if the neutral and ground wires are mixed, this will cause the leakage circuit breaker to trip, preventing it from functioning properly. Therefore, repeated grounding cannot be done on the working neutral wire.