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Student & Learning Zone - City & Guilds
PEFC - Design Vs testing
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<blockquote data-quote="DonClif" data-source="post: 555390" data-attributes="member: 36659"><p>Hi guys,</p><p></p><p>I might be having a brain fart on this one, but can anyone enlighten me on this one:</p><p></p><p>(Stop me if I'm talking bum at any point)</p><p></p><p>When designing a circuit you calculate the R1+R2, add it to the Ze, end up with Zs.</p><p>You then do Uo x Cmin ÷ Zs to get your PEFC.</p><p>So you have a PEFC based off of the entire circuit from the socket to the transformer.</p><p>BUT when you are testing an installation you complete the PEFC test on the 'feed' of the main switch, with the switch open.</p><p>So than means you get a PEFC reading from the DB to the transformer.</p><p></p><p>If I'm not completely away with the fairies tonight, and I have this correct, then why do we effectively get the same thing from different places and using different parts of the circuit?</p><p></p><p>Is this just one of those: "Because that's how it is" situations, or should I know the answer?</p><p></p><p>Cheers</p></blockquote><p></p>
[QUOTE="DonClif, post: 555390, member: 36659"] Hi guys, I might be having a brain fart on this one, but can anyone enlighten me on this one: (Stop me if I'm talking bum at any point) When designing a circuit you calculate the R1+R2, add it to the Ze, end up with Zs. You then do Uo x Cmin ÷ Zs to get your PEFC. So you have a PEFC based off of the entire circuit from the socket to the transformer. BUT when you are testing an installation you complete the PEFC test on the 'feed' of the main switch, with the switch open. So than means you get a PEFC reading from the DB to the transformer. If I'm not completely away with the fairies tonight, and I have this correct, then why do we effectively get the same thing from different places and using different parts of the circuit? Is this just one of those: "Because that's how it is" situations, or should I know the answer? Cheers [/QUOTE]
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PEFC - Design Vs testing
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