TNS-Earthing System

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Anonymous Poster #1	TNS-Earthing System 06/07/2013 4:35 AM
	Hi All, TNS-Earthing System. If there is a loss to the Main Earthing(No Electrical earthing at all,Main earth cable disconnected from the main earth terminal)and there is a L-E short Circuit to the MSB. 1)Will the Main ACB/MCCB trip? 2)Will the Earth Fault Relay activated?
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Pattabhiraman Commentator Join Date: May 2013 Posts: 86 Good Answers: 2	#1 Re: TNS-Earthing System 06/07/2013 4:48 AM
	1) It may or may not 2) It may or may not But some body will definitely get a shock or burn injury if they are in the vicinity of the MSB. Better to ensure there is no loss to main earthing (now what is "main earthing").
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kianhwee Participant Join Date: Dec 2012 Posts: 2	#2 In reply to #1 Re: TNS-Earthing System 06/07/2013 5:00 AM
	Hi Pattabhiraman, Main earthing refer to the TNS earthing where the earth cable connects to the Earth Terminal.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#3 In reply to #2 Re: TNS-Earthing System 06/07/2013 5:27 AM
	Nothing changes with this additional detail. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Pattabhiraman Commentator Join Date: May 2013 Posts: 86 Good Answers: 2	#5 In reply to #3 Re: TNS-Earthing System 06/07/2013 5:33 AM
	Absolutely.
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Pattabhiraman Commentator Join Date: May 2013 Posts: 86 Good Answers: 2	#4 In reply to #2 Re: TNS-Earthing System 06/07/2013 5:29 AM
	I think it is better to describe it as protective earthing (PE) so as not to confuse with neutral earthing.
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zamanengineer001 Associate Join Date: Sep 2011 Posts: 26	#6 Re: TNS-Earthing System 06/07/2013 7:35 AM
	If there is a loss of earth, no current path and there would no high current and no tripping of ACB/MCCB .
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Pattabhiraman Commentator Join Date: May 2013 Posts: 86 Good Answers: 2	#7 In reply to #6 Re: TNS-Earthing System 06/07/2013 8:12 AM
	Not necessarily. It depends on other system conditions. That's why "It may or may not".
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