# Explain about different type of Earthing system

**URL:** <https://forumautomation.com/t/explain-about-different-type-of-earthing-system/166>\
**Category:** Electrical\
**Tags:** switchgear\
**Created:** [November 28, 2014, 4:15am UTC](https://forumautomation.com/t/explain-about-different-type-of-earthing-system/166 "2014-11-28T04:15:13Z")\
**Posts on this page:** 1\
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**Author:** ![instrulover](https://forumautomation.com/letter_avatar_proxy/v4/letter/i/3ab097/32.png) [@instrulover](https://forumautomation.com/u/instrulover)\
**Post date:** [November 28, 2014, 4:23am UTC](https://forumautomation.com/t/explain-about-different-type-of-earthing-system/166/2 "2014-11-28T04:23:51Z")

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one needs to distinguish between to what is commonly referred to as the " Dirty Earth", also known as the general Electrical earth; To this mat all ELECTRICAL devices are connected.( Motors, drives soft starts etc) Then there is the “Clean earth” mat used for all field Instrumentation and DCS/PLC earthing. The 2 mats are very often located under the same MCC or Equipment room and should be at least 3.5m apart to prevent inter-action. Correct earthing of Instrumentation systems is critical to their performance and should be correctly applied.

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