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<blockquote data-quote="Tony S" data-source="post: 465039" data-attributes="member: 20864"><p>There are numerous proprietary relays available, mainly American due to their love of weird and wonderful supply systems. Earth free systems are frowned on in the UK, they certainly can not be used for LV distribution.</p><p></p><p>We used them for single phase induction furnaces because the current was so high the conductors were hollow and so water could be pumped through them. It took me about three months to find an intermittent earth fault.</p><p></p><p><a href="https://electricianforum.co.uk/knowledgebase/transformers/strange/low-frequency-induction-furnace-r75/" target="_blank">https://talk.electricianforum.co.uk/knowledgebase/transformers/strange/low-frequency-induction-furnace-r75/</a></p></blockquote><p></p>
[QUOTE="Tony S, post: 465039, member: 20864"] There are numerous proprietary relays available, mainly American due to their love of weird and wonderful supply systems. Earth free systems are frowned on in the UK, they certainly can not be used for LV distribution. We used them for single phase induction furnaces because the current was so high the conductors were hollow and so water could be pumped through them. It took me about three months to find an intermittent earth fault. [URL="https://electricianforum.co.uk/knowledgebase/transformers/strange/low-frequency-induction-furnace-r75/"]https://talk.electricianforum.co.uk/knowledgebase/transformers/strange/low-frequency-induction-furnace-r75/[/URL] [/QUOTE]
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