Internal Fault

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al-rujaibi Member Join Date: Dec 2006 Posts: 5	Internal Fault 12/22/2011 12:57 AM
	How can we prevent a fault current within a premises be transferred to the low voltage distribution network?
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#1 Re: internal fault 12/22/2011 1:18 AM
	Ground it... __________________ All living things seek to control their own destiny....this is the purpose of life
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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: internal fault 12/22/2011 3:15 AM
	By using appropriate circuit protection devices at the secondary of the local distribution transformer and further downstream of it. British Standard 7671 shows the way. __________________ "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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Ron Nombri Power-User Join Date: May 2007 Location: Papua New Guinea Posts: 174 Good Answers: 3	#3 Re: internal fault 12/22/2011 4:29 AM
	Additionally, determine the loading current and short circuit current so that the correct protection device is installed. Protection device shall be perfectly rated to the load current and will trip within time limits as per the protection devices ratings. You may also consider installing surge divertors/arrestors at the switch boards. They will also assist in grounding any power surge and short circuit current effects. __________________ Kind regards, Ron
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