110V DC System - Voltage Question - CR4 Discussion Thread

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Anonymous Poster	110V DC System - Voltage Question 02/07/2011 11:41 AM
	Hi, 110 V d.c system ,what would be the voltage of -ve bus to earth?
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#1 Re: 110V DC System - Voltage Question 02/07/2011 12:10 PM
	Depends on where the DC system is earthed. Need more information! __________________ The reports of my death are greatly exaggerated.
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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: 110V DC System - Voltage Question 02/07/2011 12:45 PM
	It will be 0V if the negative is earthed, -110V if the positive is earthed, and if neither is earthed it will be whatever a high impedence digital voltmeter can make of it.... _<sigh>. __________________ "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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yannissou Active Contributor Join Date: Jan 2011 Posts: 11	#3 In reply to #2 Re: 110V DC System - Voltage Question 02/07/2011 1:57 PM
	Good evening guys, Very correct statement PWSlack on the first two cases, i would re-phrase the third case to 'whatever voltage can be created across the insulation leakages (resistance paths) of +ve and -ve poles to ground, including the input impedance of the measuring device in the calculation.
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xformdesign Active Contributor Join Date: Feb 2011 Location: Chennai Posts: 19	#5 In reply to #2 Re: 110V DC System - Voltage Question 02/08/2011 8:55 AM
	hello pwslack, can you kindly explain me how it happens??? __________________ keep your hands on a stove for one minute, u feel like a hour.. sit and chat with a pretty girl for a hour, u feel like a minute...That is 'RELATIVITY"/
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omar_beyaty Participant Join Date: Feb 2008 Posts: 4	#4 Re: 110V DC System - Voltage Question 02/07/2011 5:14 PM
	it is dependant to which we will attach the -ve terminal of the AVO ....in case we attached it to the earth we will get +110 whilst a 0 V in case it attached to the ground of the DC system.....However, it doesnt matter which value the -ve terminal would be as we connect the DC system voltage properly to its relevant loads as they isolated completely from the AC system.
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Anonymous Poster	#6 Re: 110V DC System - Voltage Question 02/12/2011 11:56 AM
	if you earth the -ve or +ve to earth through multimeter it will decreased the value due to capacitor discharge. I think no value will be shown. or nothing happens due to short the -ve bus to earth.
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Anonymous Poster (1); omar_beyaty (1); PWSlack (1); TonyS (1); xformdesign (1); yannissou (1)

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110V DC System - Voltage Question