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Electrical Inspection & Testing Forum
X5 RCD Test ?
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<blockquote data-quote="Battersby" data-source="post: 32652" data-attributes="member: 2000"><p>Dude, you're getting well confused.</p><p></p><p>RCDs may be used to assist disconnection for earth faults where disconnection times cannot be met by overcurrent devices.</p><p></p><p>As minimum earth fault currents will be of the order of 1A+ a 100 or 300mA RCD will do this job perfectly well.</p><p></p><p>But, RCDs of 30mA or less are used as additional protection against electric shock (formerly referred to as 'supplementary protection against direct contact'). And these are required, by the regulations, to disconnect within 40ms at 5xResidual current rating. That's why they are tested at this level - nothing to do with NICEIC and nothing to do with disconnecting earth fault currents (see definition).</p><p></p><p>These are two distinct uses of RCDs that every spark should understand.</p><p></p><p>Hope that helps. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Battersby, post: 32652, member: 2000"] Dude, you're getting well confused. RCDs may be used to assist disconnection for earth faults where disconnection times cannot be met by overcurrent devices. As minimum earth fault currents will be of the order of 1A+ a 100 or 300mA RCD will do this job perfectly well. But, RCDs of 30mA or less are used as additional protection against electric shock (formerly referred to as 'supplementary protection against direct contact'). And these are required, by the regulations, to disconnect within 40ms at 5xResidual current rating. That's why they are tested at this level - nothing to do with NICEIC and nothing to do with disconnecting earth fault currents (see definition). These are two distinct uses of RCDs that every spark should understand. Hope that helps. :) [/QUOTE]
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