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Discuss Smaller MCCB feeding larger MCCB-RCCB in the Electrical Forum area at ElectriciansForums.net

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Anything wrong with this?
125Amp 4 pole MCCB from panel fed to new panel with 150mm 4 core ALI then in that new panel 250Amp MCCB/RCCB then all sub circuits?
 
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Spoon

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What installation method?
 

Ian1981

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Is the 250 breaker/isolator just a switch disconnector to BSEN 60947-3 or is it actually a circuit breaker to BSEN 60947-2?
 
T

Toneyz

What is the reason for the MCCB/RCCB? (and I am referring more to the RCCB element).
 
Have they used the 125a to protect the cable and then 250a for the RCD protection? I sometimes come across a 10a 60898 then a 32a 61009 separately before the first light for example.
 

Spoon

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Am I seeing aluminium cores involved?
I'm presuming, yes. The OP says "150mm 4 core ALI" in the first post. That is why I asked about installation method.
 
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