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Test To Measure Zs For Rcbo Final Circuit
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<blockquote data-quote="says-les" data-source="post: 312214" data-attributes="member: 15145"><p>This is wrong, Pro Dave!</p><p></p><p>Zs values are all to do with Earth Fault Current and the time taken to clear. Do you realise the definition of Zs? It is R1+R2+Ze. This is the earth fault path's impedance. Nout to do with overload or short circuit protection. If you fit say a 32 Amp protective device to protect say a cable rated at 32 Amp or above then you need not do any test to ensure that the device will clear the circuit in event of an overload or short circuit. I think you are confusing like so many out there, earth fault loop with short circuit loop, i.e. L-E loop with L-N loop. Hope this clears up your thinking.</p><p></p><p>Les</p><p></p><p>Steptoe, do you not know what an RCBO is? It is a circuit breaker that incorporates both overcurrent and earth leakage protection. Some makes of circuit breaker like MEM can be converted to RCBO by adding a pod which gives the breaker the earth leakage protection part. The BS EN number is manufacturing standard reference.</p><p></p><p>Cheers</p><p></p><p>Les</p></blockquote><p></p>
[QUOTE="says-les, post: 312214, member: 15145"] This is wrong, Pro Dave! Zs values are all to do with Earth Fault Current and the time taken to clear. Do you realise the definition of Zs? It is R1+R2+Ze. This is the earth fault path's impedance. Nout to do with overload or short circuit protection. If you fit say a 32 Amp protective device to protect say a cable rated at 32 Amp or above then you need not do any test to ensure that the device will clear the circuit in event of an overload or short circuit. I think you are confusing like so many out there, earth fault loop with short circuit loop, i.e. L-E loop with L-N loop. Hope this clears up your thinking. Les Steptoe, do you not know what an RCBO is? It is a circuit breaker that incorporates both overcurrent and earth leakage protection. Some makes of circuit breaker like MEM can be converted to RCBO by adding a pod which gives the breaker the earth leakage protection part. The BS EN number is manufacturing standard reference. Cheers Les [/QUOTE]
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