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mccb as main switch
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<blockquote data-quote="netblindpaul" data-source="post: 122739" data-attributes="member: 7384"><p>Ah but, an mccb is an overload protective device.</p><p></p><p>I don't believe that anyone on here has instruments sufficiently accurate to measure the Zs at a 1200A mccb to the required levels!</p><p></p><p>You would need a 4 wire milli ohm meter or a ductor tester to get sufficiently accurate results!</p><p></p><p>Well...</p><p></p><p>As long as the upstream cpd will protect the circuits up to the input to the final circuit mcb's then perhaps you could ignore the issue.</p><p></p><p>I have done this in the past with an mccb, as long as the pfc is below the fault rating of the mccb though, most are 25 or 35kA.</p><p></p><p>UNLESS you have sufficient upstream protection.</p><p></p><p>Remembering that protection does not meen that the downstream devices are re-useable, just that no "collateral" damage is caused!</p></blockquote><p></p>
[QUOTE="netblindpaul, post: 122739, member: 7384"] Ah but, an mccb is an overload protective device. I don't believe that anyone on here has instruments sufficiently accurate to measure the Zs at a 1200A mccb to the required levels! You would need a 4 wire milli ohm meter or a ductor tester to get sufficiently accurate results! Well... As long as the upstream cpd will protect the circuits up to the input to the final circuit mcb's then perhaps you could ignore the issue. I have done this in the past with an mccb, as long as the pfc is below the fault rating of the mccb though, most are 25 or 35kA. UNLESS you have sufficient upstream protection. Remembering that protection does not meen that the downstream devices are re-useable, just that no "collateral" damage is caused! [/QUOTE]
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