Antwort Co je to TN-s? Weitere Antworten – Co je to síť TN CS

Co je to TN-s?
Síť TN je charakterizovaná spojením neživých částí s uzemněným bodem sítě prostřednictvím ochranného vodiče PEN. Síť TN-C je klasické provedení sítě TN, které se v ČR uplatňovalo v běžné výstavbě do r. 1995. V těchto sítích, které se nadále provozují, se pro funkci ochranného vodiče PE využívá střední vodič sítě N.Do rodinného domku klasicky přivedena TNC síť přes hlavní domovní skříň a elektroměrovou skříň. Za elektroměrem v měřené části je bod rozdělení PEN na PE a N a domovní rozvody jsou tak již TNS.Jen a pouze takovouto síť, kde vede samostatně N/PE od zdroje, lze označovat jako TN-S. V okamžiku, kdy se někde v síti objeví vodič PEN, tak už se nikdy nebude a nemůže jednat o síť TN-S. Pokud od zdroje vede PEN vodič, čili je kombinovaný střední a ochranný vodič, pak se toto připojení označuje TN-C.

Co je vodič T : Uzel sítě je přímo uzemněný (T), neživé části spojené s ochranným vodičem (N), pak následuje část sítě provedená jako TN-C (kombinovaný ochranný vodič se středním) a v určitém místě se provede rozdělení ochranného a středního vodiče, takže dále pokračuje síť TN-S. Oba vodiče se pak již nikdy nesmí spojit!

Co to je TN s

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Sítě TT jsou sítě, které mají

neživé části jsou uzemněny nezávisle na síti (spojení neživých částí s tímto uzemněním se označuje druhým písmenem v označení sítě, tj. písmenem T).

Proudový chránič nesmí být používán v sítích TN-C. Jestliže je proudový chránič používán v síti TN-C-S, nesmí být vodič PEN použit za chráničem na straně zátěže. Spojení ochranného vodiče s vodičem PEN musí být provedeno před chráničem, tj. na straně zdroje.

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Sítě TT jsou sítě, které mají

neživé části jsou uzemněny nezávisle na síti (spojení neživých částí s tímto uzemněním se označuje druhým písmenem v označení sítě, tj. písmenem T).

Co je to vodič PEN

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► Vodič PEN – vodič, který v sobě sdružuje funkce ochranného a středního vodiče. Je to pracovní vodič, ale funkce ochrany je nadřazena funkci středního vodiče. Proto se na něj vztahují předpisy jako na ochranný vodič. 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Podmínka, která musí být pro zajištění automatického odpojení splněna je Zs ≤ 0,5 × Uo/Ia. 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lokální sítě – LAN (Local Area Network), metropolitní sítě – MAN (Metropolian Area Network), rozsáhlé sítě – WAN (Wide Area Network), globální sítě – GAN (Global Area Network).

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Termín nulovací vodič je od té doby nahrazen mezinárodním označením a termínem PEN (Protective Earthing and Neutral conductor, tj. vodič ochranného uzemnění a zároveň nulový), kde písmena PE označují ochrannou funkci tohoto vodiče, písmeno N funkci pracovního – středního, lépe řečeno nulového, popř. neutrálního vodiče.

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Modrý vodič lze přeznačit a použít jako jiný vodič sítě. Nesmí se přeznačit zeleno-žlutě. Černý a hnědý vodič lze přeznačit a použít jako jiný vodič sítě. Nesmí se přeznačit zeleno-žlutě.

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Impedance smyčky Zs (odpor smyčky svodového proudu) musí být tak malá, že při svodu na kostru proteče proud schopný odpojit předřazený nadproudový jistič. Protože vypínací proud (zkratový proud) spotřebiče nelze přímo měřit, je zjištěn odpor (impedance zkratové smyčky) mezi fázovým a ochranným vodičem.

Jak se dělí sítě

LAN (local area network) – místní počítačová síť například v domácnosti či jedné budově (např. ethernet), MAN (metropolitan area network) – metropolitní síť propojující větší množství zařízení v městské zástavbě, WAN (wide area network) – rozlehlá síť spojující LAN a MAN sítě (např.

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Nejčastěji můžeme v novějších elektrických rozvodech vidět vodiče černé nebo hnědé barvy, označovat je budeme velkým písmenem L (fáze). Barva druhého vodiče by měla být modrá, ale můžeme se setkat i se zelenožlutými, který budeme označovat písmenem N (nula).

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Je to pracovní vodič, ale funkce ochrany je nadřazena funkci středního vodiče. Proto se na něj vztahují předpisy jako na ochranný vodič. Neodborně a zastarale se mu říká „nulák“. Tento vodič musí mít nejmenší průřez 10mm2 u mědi a 16mm2 u hliníku.

Antwort Co je to TN-s? Weitere Antworten – Co je to síť TN CS

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