Line to Neutral Fault on TN-S System

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Anonymous Poster #1	Line to Neutral Fault on TN-S System 01/22/2024 7:05 AM
	Does the RCD trip for line to neutral fault on TN-S system? (or) Does it trip only for line to earth fault on TN-S system?
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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	#1 Re: Line to Neutral Fault on TN-S System 01/22/2024 7:40 AM
	No: a live to neutral fault just looks like a load. Of course, if the fault load is high other safety devices should react. __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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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	#2 Re: Line to Neutral Fault on TN-S System 01/22/2024 11:10 AM
	A1) An <...RCD...> won't; see GA #1⇑. A residual current breaker overload [RCBO] will, however, on the overcurrent function and not the earth current function. A2) Both <...RCD...> and RCBO will also trip on neutral-to-earth fault. <...TN-S...> The earthing arrangement deployed is irrelevant in this discussion. __________________ "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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raghun Power-User Join Date: Jan 2010 Location: Hyderabad Posts: 343 Good Answers: 22	#3 Re: Line to Neutral Fault on TN-S System 01/23/2024 2:00 AM
	RCD will not trip for Line-to-Neutral fault as the device takes in the neutral current (along with line current) for summation. Earth involvement in fault is necessary for RCD to trip. __________________ Raghunath
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vsar Guru Join Date: May 2010 Location: Metro.Manila, Philippines. Posts: 1271 Good Answers: 27	#4 Re: Line to Neutral Fault on TN-S System 01/23/2024 8:36 AM
	On a TN-S system generally any "Fault" with respect to the ground as the safety reference point of the earthing mechanisms should trip any of the protective circuit devices incorporated in the system... Faults like any electrical safety related earth referenced fault that can be due to like a high leakage current, an abnormally drawn current overload or lightning induced surge current, etc.. __________________ vsar
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PWSlack (1); raghun (1); Randall (1); vsar (1)

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