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Electrical Inspection & Testing Forum
X5 RCD Test ?
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 30632" data-attributes="member: 250"><p>Strictly speaking the x5 RCD test is only required where your max Zs values cannot be met..</p><p></p><p>e.g. TT installations..</p><p></p><p>nowt to do with 17th ed... the "old money" reg was 412-06-02 (ii)</p><p></p><p>If all of your max Zs values are met then the MCB will do its disconnection job OK.. &amp; no need for x5 RCD test..</p><p></p><p>BUT Pepe's like NICEIC still like you to do x5 ALL of the time anyway! :| </p><p></p><p>its all down to those levels &amp; duration of shock currents to prevent death!</p><p></p><p>and where RCD is used as "Additional Protection" due to probability MCB cannot operate fast enough under live - earth fault!</p><p></p><p>they say 20ma - 30ma can impair breathing ,,</p><p></p><p>50ma &amp; above can cause ventricular fibrillation (whoever she is?) and Death! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /> </p><p></p><p>5x30ma...</p><p></p><p>ensure fault current @ 150ma or greater cuts off in 40ms MAX!! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 30632, member: 250"] Strictly speaking the x5 RCD test is only required where your max Zs values cannot be met.. e.g. TT installations.. nowt to do with 17th ed... the "old money" reg was 412-06-02 (ii) If all of your max Zs values are met then the MCB will do its disconnection job OK.. & no need for x5 RCD test.. BUT Pepe's like NICEIC still like you to do x5 ALL of the time anyway! :| its all down to those levels & duration of shock currents to prevent death! and where RCD is used as "Additional Protection" due to probability MCB cannot operate fast enough under live - earth fault! they say 20ma - 30ma can impair breathing ,, 50ma & above can cause ventricular fibrillation (whoever she is?) and Death! :( 5x30ma... ensure fault current @ 150ma or greater cuts off in 40ms MAX!! ;) [/QUOTE]
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