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	<title>EC&#038;M HRG and Arc Flash</title>
	<link>http://expert.ecmweb.com/hrg-and-arc-flash</link>
	<description>Just another ATE weblog</description>
	<pubDate>Mon, 14 Jul 2008 15:08:04 +0000</pubDate>
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		<title>Cable Insulation during a Phase to Ground Fault</title>
		<link>http://expert.ecmweb.com/hrg-and-arc-flash/2008/06/17/cable-insulation-during-a-phase-to-ground-fault/</link>
		<comments>http://expert.ecmweb.com/hrg-and-arc-flash/2008/06/17/cable-insulation-during-a-phase-to-ground-fault/</comments>
		<pubDate>Tue, 17 Jun 2008 15:29:20 +0000</pubDate>
		<dc:creator>John_Szabados</dc:creator>
		
		<guid>http://expert.ecmweb.com/hrg-and-arc-flash/2008/06/17/cable-insulation-during-a-phase-to-ground-fault/</guid>
		<description><![CDATA[I am designing a 480V HRG system consisting of 480V switchgear to a 480V MCC.  All my loads are three phase and I am beginning to specify equipment and cable.  I know I will have 173% on my unfaulted phases from a line to ground fault.  Should I be specifying insulation higher [...]]]></description>
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		<title>Transformer HRG Resistor Values</title>
		<link>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/21/transformer-hrg-resistor-values/</link>
		<comments>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/21/transformer-hrg-resistor-values/</comments>
		<pubDate>Wed, 21 May 2008 17:24:24 +0000</pubDate>
		<dc:creator>Erik_Warner</dc:creator>
		
		<guid>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/21/transformer-hrg-resistor-values/</guid>
		<description><![CDATA[What size Resistor should be specified for a 2500KVA Transformer with a 480V WYE connected secondary?  What happens if the value is smaller or larger than the "correct" value?  What happens if you have two paralled 2500KVA Transformers each with a HRG?  Should the HRG Value be adjusted then transformers are paralleled? ]]></description>
		<wfw:commentRSS>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/21/transformer-hrg-resistor-values/feed/</wfw:commentRSS>
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		<title>IEEE &#038; NFPA formulas</title>
		<link>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/08/ieee-nfpa-formulas/</link>
		<comments>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/08/ieee-nfpa-formulas/</comments>
		<pubDate>Thu, 08 May 2008 16:37:04 +0000</pubDate>
		<dc:creator>Michael_Goslak</dc:creator>
		
		<guid>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/08/ieee-nfpa-formulas/</guid>
		<description><![CDATA[The problem is though, IEEE and NFPA formulas are based on 3-phase bolted faults. HRG doesn't even factor into the equation! Until they rewrite the formulas, there's not much we can mathematically do. ]]></description>
		<wfw:commentRSS>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/08/ieee-nfpa-formulas/feed/</wfw:commentRSS>
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		<title>Existing installation</title>
		<link>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/06/existing-installation/</link>
		<comments>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/06/existing-installation/</comments>
		<pubDate>Tue, 06 May 2008 17:35:25 +0000</pubDate>
		<dc:creator>Jorge_Osorio</dc:creator>
		
		<guid>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/06/existing-installation/</guid>
		<description><![CDATA[What about existing installations? is just installing HRG that we solve possible risks? What else we should consider in a industrial installation? ]]></description>
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		<title>compare with GFCI</title>
		<link>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/05/compare-with-gfci/</link>
		<comments>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/05/compare-with-gfci/</comments>
		<pubDate>Mon, 05 May 2008 14:33:22 +0000</pubDate>
		<dc:creator>Mark_Westgate</dc:creator>
		
		<guid>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/05/compare-with-gfci/</guid>
		<description><![CDATA[On it's most basic level, is this the same principle as a GFCI outlet in a residential application? ]]></description>
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		<title>Arcing faults</title>
		<link>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/01/arcing-faults/</link>
		<comments>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/01/arcing-faults/</comments>
		<pubDate>Thu, 01 May 2008 16:30:08 +0000</pubDate>
		<dc:creator>John_Vamos</dc:creator>
		
	<category>Uncategorized</category>
		<guid>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/01/arcing-faults/</guid>
		<description><![CDATA[I would say that use of HRG will greatly reduce the risk of arcing faults on a 480 V system, since the large majority of faults begin life as a line-to-ground fault. But what the others are saying is that it does NOT reduce the hazard that can exist for a three-phase arcing fault, so [...]]]></description>
		<wfw:commentRSS>http://expert.ecmweb.com/hrg-and-arc-flash/2008/05/01/arcing-faults/feed/</wfw:commentRSS>
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