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In a TT (terra–terra) earthing system, just as with a TN system, there is a direct connection to Earth at the supply transformer. But, unlike TN, the exposed-conductive-parts at the consumer installation are independent from it, instead having an entirely separate connection to Earth via a local earth electrode (sometimes referred to as the ...
Circuit diagram of a TN-C-S earthing system This media file is uncategorized. Please help improve this media file by adding it to one or more categories, so it may be associated with related media files ( how?
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While the TN-S and TT diagrams are fine, the TN-C and TN-C-S diagrams are problematic. The TN-C diagram is supposed to depict a combined PE+N conductor for both the supply and installation wiring (no separation at all), but PE and N are shown as separate conductors in part of the diagram. With the TN-C-S diagram, there's no PEN label.
The purpose of connecting the customer's system to ground is to limit the voltage that may develop if high voltage conductors fall down onto lower-voltage conductors which are usually mounted lower to the ground, or if a failure occurs within a distribution transformer. Earthing systems can be TT, TN-S, TN-C-S or TN-C.
An isolated ground (IG) (or Functional Earth (FE) in European literature) is a ground connection to a local earth electrode from equipment where the main supply uses a different earthing arrangement, one of the common earthing arrangements used with domestic mains supplies.
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A grounding transformer or earthing transformer is a type of auxiliary transformer used in three-phase electric power systems to provide a ground path to either an ungrounded wye or a delta-connected system. [1] [2] Grounding transformers are part of an earthing system of the network.