LV Switchgears Requirement

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jeskong Active Contributor Join Date: Jun 2011 Posts: 12	LV Switchgears Requirement 06/30/2011 5:42 AM
	is it practical to have 300-500mA Earth Leakage protection for the 2500A 4P Main Incoming protection?
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#1 Re: LV Switchgears requirement. 06/30/2011 5:58 AM
	It possible but I wouldn't say it's practical. For 2.5KA you must have out going feeds, they would be the best place for E/L protection. __________________ The reports of my death are greatly exaggerated.
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jeskong Active Contributor Join Date: Jun 2011 Posts: 12	#3 In reply to #1 Re: LV Switchgears requirement. 06/30/2011 9:01 AM
	The outgoings are 630A (5x), 400A (3x) & 150A (2x) For the incoming 2500A 3P ACB (65ka), can i use Icu=Ics=35ka?
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#4 In reply to #3 Re: LV Switchgears requirement. 06/30/2011 1:22 PM
	Read http://cr4.globalspec.com/thread/69820 you started the thread, and as far as I can see it was answered very well. __________________ The reports of my death are greatly exaggerated.
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jeskong Active Contributor Join Date: Jun 2011 Posts: 12	#5 In reply to #4 Re: LV Switchgears requirement. 07/05/2011 11:31 PM
	Thanks TonyS, I guess i have misinterpret the reply. It is an arguement with the authorities/clients as they have received comments from the guidelines that the 300-500mA EL Protection must be incorporated to the incoming, regardless of the Capacity. And, my undertstanding was that if we have installed the mentioned EL Protection to the ACB, that may cause frequent tripping of the system, shall there be any start/stop operation for the downstream loads. Should we needed more sensitive and prompt protection, isnt that we can install the EL Protection at the downstream. Shall there be any possible fault on Earth Leakage, then it will trip the localised area but not the complete downstream from the Main Distribution Board. Please comment whether my understanding is right or wrong?
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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: LV Switchgears requirement. 06/30/2011 6:21 AM
	Are they made for that throughput rating? __________________ "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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