Earthing arrangement at a factory.

[StokieSpark]

Okay, been working at a factory today and need to establish the earthing arrangement of it..

The power comes from a substation which has an earth electrode, then after the transformer the cables come into the factory with the earthing conductor..

Am i right in saying the installation is a TT? as it has an electrode in the substation....

 

[Engineer54]

NO, ....The earth electrodes are a means of earthing/referencing the neutral at the Transformer, and there will be more than just one electrode, especially in an industrial factory setting!!. The earthing system after it leaves the Transformer, will then from your description, be a TN-S system...

All secondaries of general distribution Transformers have there neutral point grounded in this way...

 

[Deleted member 26818]

Yes TN-S.