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MCB/RCD on consumer unit tripping
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<blockquote data-quote="Sidewinder" data-source="post: 506178" data-attributes="member: 9512"><p>An AFDD is designed to trip at the last possible moment to minimise nuisance trips.</p><p></p><p>It constantly analyses the current and voltage waveforms to identify arcing and if this is identified it will trip.</p><p></p><p>The way this is done involves high speed signal processing, FFT's and look up tables.</p><p></p><p>The arc has to be sustained and repeated.</p><p></p><p>The exact way each device operates is down to the OEM, they just need to perform in accordance with the standard.</p><p></p><p>In the event of a L&gt;E arc, it is likely that the RCD would trip first.</p><p></p><p>In the event of a L&gt;N arc the AFDD should detect this before the MCB.</p><p></p><p>In the event of a L&gt;L arc or a N&gt;N arc the it is only the AFDD that will detect this.</p><p></p><p>L&gt;L or N&gt;N are series arcs in the same conductor caused by damage.</p><p></p><p>This is typically in flexes such as abused extension leads, etc.</p><p></p><p>I don’t have the product standard printed out here to quote from in hospital.</p><p></p><p>You need a copy of BS EN 62606, £350 from BSI for the perfrmance requirements.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 506178, member: 9512"] An AFDD is designed to trip at the last possible moment to minimise nuisance trips. It constantly analyses the current and voltage waveforms to identify arcing and if this is identified it will trip. The way this is done involves high speed signal processing, FFT's and look up tables. The arc has to be sustained and repeated. The exact way each device operates is down to the OEM, they just need to perform in accordance with the standard. In the event of a L>E arc, it is likely that the RCD would trip first. In the event of a L>N arc the AFDD should detect this before the MCB. In the event of a L>L arc or a N>N arc the it is only the AFDD that will detect this. L>L or N>N are series arcs in the same conductor caused by damage. This is typically in flexes such as abused extension leads, etc. I don’t have the product standard printed out here to quote from in hospital. You need a copy of BS EN 62606, £350 from BSI for the perfrmance requirements. [/QUOTE]
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MCB/RCD on consumer unit tripping
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