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<blockquote data-quote="JonesK" data-source="post: 522604" data-attributes="member: 34477"><p>It could be what is called " Accumulative earth leakage". Its the sum of each individual earth leakage from each individual caravan which is insufficient to trip the local 30Ma RCD units but when added together trip the 300mA Main RCD Unit. You need an earth leakage ammeter top measure this leakage current.</p><p></p><p>OR</p><p></p><p>It could be a faulty 300mA rcd unit. I would recommend undertaking an RCD ramp test under load and no load conditions to determine this.</p></blockquote><p></p>
[QUOTE="JonesK, post: 522604, member: 34477"] It could be what is called " Accumulative earth leakage". Its the sum of each individual earth leakage from each individual caravan which is insufficient to trip the local 30Ma RCD units but when added together trip the 300mA Main RCD Unit. You need an earth leakage ammeter top measure this leakage current. OR It could be a faulty 300mA rcd unit. I would recommend undertaking an RCD ramp test under load and no load conditions to determine this. [/QUOTE]
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