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Unbalanced loads on a 3 phase RCD
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<blockquote data-quote="binky" data-source="post: 445767" data-attributes="member: 490"><p>Never seen an inverter specced as being for TT only, they can generally be used for any earthing system. About all the manuals say is 'install to local regs'.... Must be loads of 16th edition TT installations that are incorrect, but in most domestic settings it isn't hard to get access to the main incoming point.</p><p></p><p>This site has an earth rod at the distribution boards located about 150m from the main incoming point, I've not checked to see if it connected to the earthing for the sub-main cable, I suspect it probably is, not that that would stop a back-feed to the main incomer should that cable get damaged.</p><p></p><p>I've attached a cert for a Samil inverter, seems these are set for 0.5s. I get your point about standards, but if I can demonstrate that a particular brand of inverter complies with requirements of BS7671, I don't see a problem, would need to mark up installation that this is the case / cert accordingly.</p><p></p><p>[ATTACH]8059[/ATTACH]</p></blockquote><p></p>
[QUOTE="binky, post: 445767, member: 490"] Never seen an inverter specced as being for TT only, they can generally be used for any earthing system. About all the manuals say is 'install to local regs'.... Must be loads of 16th edition TT installations that are incorrect, but in most domestic settings it isn't hard to get access to the main incoming point. This site has an earth rod at the distribution boards located about 150m from the main incoming point, I've not checked to see if it connected to the earthing for the sub-main cable, I suspect it probably is, not that that would stop a back-feed to the main incomer should that cable get damaged. I've attached a cert for a Samil inverter, seems these are set for 0.5s. I get your point about standards, but if I can demonstrate that a particular brand of inverter complies with requirements of BS7671, I don't see a problem, would need to mark up installation that this is the case / cert accordingly. [ATTACH]8059._xfImport[/ATTACH] [/QUOTE]
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Unbalanced loads on a 3 phase RCD
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