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Multiple Transfer Switches in same enclosure (Domestic Battery Install)
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<blockquote data-quote="wildej" data-source="post: 531443" data-attributes="member: 35240"><p>That is covered internally to the Victron. When the grid is lost, an internal relay disconnects the inverter from the grid feed in order to be G99 compliant and operate in island mode (to ensure no chance of backfeeding and making DNO/DSO cables live when they shouldn't be). When this happens, a few ms later there is a second internal relay that bonds the neutral to earth, allowing the RCDs downstream to continue to have an earth referenced to neutral. The earth being an extra electrode to replace the TN that has to be assumed to be lost with the LINE and Neutral in event of grid failure.</p><p></p><p>I have since realised that one of my CUs is a split RCD type and has some circuits unprotected (except for MCBs). As a result, I was planning to add a type S time delay 100ma RCD between the Victron ACout and the transfer switches, also in this enclosure, as effectively in island mode it will be TT earthed and everything must be RCD protected. In due course, CU will be changed and have RCBOs, but not yet.</p><p></p><p>Thanks for your reply. Hopefully that makes sense? What did you think about the single enclose point though, doing all these tasks?</p></blockquote><p></p>
[QUOTE="wildej, post: 531443, member: 35240"] That is covered internally to the Victron. When the grid is lost, an internal relay disconnects the inverter from the grid feed in order to be G99 compliant and operate in island mode (to ensure no chance of backfeeding and making DNO/DSO cables live when they shouldn't be). When this happens, a few ms later there is a second internal relay that bonds the neutral to earth, allowing the RCDs downstream to continue to have an earth referenced to neutral. The earth being an extra electrode to replace the TN that has to be assumed to be lost with the LINE and Neutral in event of grid failure. I have since realised that one of my CUs is a split RCD type and has some circuits unprotected (except for MCBs). As a result, I was planning to add a type S time delay 100ma RCD between the Victron ACout and the transfer switches, also in this enclosure, as effectively in island mode it will be TT earthed and everything must be RCD protected. In due course, CU will be changed and have RCBOs, but not yet. Thanks for your reply. Hopefully that makes sense? What did you think about the single enclose point though, doing all these tasks? [/QUOTE]
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Multiple Transfer Switches in same enclosure (Domestic Battery Install)
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