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Do-It-Yourself (DIY) Question & Answer Forum
RCD trips when oven reaches temperature or induction hob turned on (intermittent).
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<blockquote data-quote="marcher" data-source="post: 526828" data-attributes="member: 12538"><p>FWIW I found this gem on the Proteus website under technical info.</p><p></p><p>"Adjacent MCBs, RCBOs or MCB/RCD combinations should</p><p>not be continuously loaded at, or approaching, their normal</p><p>rated currents when mounted in enclosures. It is also good</p><p>engineering practice to make provisions for adequate free air</p><p>between devices.</p><p>Under these circumstances and, in common with other</p><p>manufacturers, we recommend a diversity factor of 66% is</p><p>applied to the MCB nominal rated current, especially if the MCB</p><p>is expected to be loaded near to or at full rating for more than</p><p>one hour.</p><p>Thermal issues should also be taken into consideration when</p><p>choosing conductor size for the protected circuits."</p><p></p><p>I wonder if this could affect the RCD trip level after extended operation? Probably not as most RCDs rely on transformer coupling but might explain MCB tripping.</p><p></p><p>As already mentioned, sharing the RCD with other circuits is also a likely cause.</p></blockquote><p></p>
[QUOTE="marcher, post: 526828, member: 12538"] FWIW I found this gem on the Proteus website under technical info. "Adjacent MCBs, RCBOs or MCB/RCD combinations should not be continuously loaded at, or approaching, their normal rated currents when mounted in enclosures. It is also good engineering practice to make provisions for adequate free air between devices. Under these circumstances and, in common with other manufacturers, we recommend a diversity factor of 66% is applied to the MCB nominal rated current, especially if the MCB is expected to be loaded near to or at full rating for more than one hour. Thermal issues should also be taken into consideration when choosing conductor size for the protected circuits." I wonder if this could affect the RCD trip level after extended operation? Probably not as most RCDs rely on transformer coupling but might explain MCB tripping. As already mentioned, sharing the RCD with other circuits is also a likely cause. [/QUOTE]
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RCD trips when oven reaches temperature or induction hob turned on (intermittent).
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