Yes you can - Is the 100mA RCD also the main switch for CU though?If you are using all 30ma RCBOs in a TT install can you do away with the 100ma/300ma main RCD?
Yes you can - Is the 100mA RCD also the main switch for CU though?If you are using all 30ma RCBOs in a TT install can you do away with the 100ma/300ma main RCD?
Not only 'yes you can' (provided that all the final circuits are RCBO-protected) but, at least theoretically, 'yes you must' if (as is probably the case) they are SP RCBOs. An N-E fault on any of the final circuits won't be cleared by a SP RCBO, and therefore will 'take out' any up-front RCD, even if it's time-delayed, hence killing the entire installation - which is technically non-compliant with current regs.Yes you can - Is the 100mA RCD also the main switch for CU though?If you are using all 30ma RCBOs in a TT install can you do away with the 100ma/300ma main RCD?
Carry on then - You don't say what size the DNO fuse is but if its 100A you should upgrade your meter tails to 25mm ²?It was the main switch but I was going to replace it with a 100A isolator.Yes you can - Is the 100mA RCD also the main switch for CU though?If you are using all 30ma RCBOs in a TT install can you do away with the 100ma/300ma main RCD?
Carry on then - You don't say what size the DNO fuse is but if its 100A you should upgrade your meter tails to 25mm ²?It was the main switch but I was going to replace it with a 100A isolator.Yes you can - Is the 100mA RCD also the main switch for CU though?If you are using all 30ma RCBOs in a TT install can you do away with the 100ma/300ma main RCD?
Then hold everything I have said - since I am confused about your current set up.Sorry but I should have said from the start this is a question about a TT'd shed from a TN-C-S Supplied house.
16mm 2 core XLPE feed.
Oh! Where does that feed come from?Sorry but I should have said from the start this is a question about a TT'd shed from a TN-C-S Supplied house. 16mm 2 core XLPE feed.
Then hold everything I have said - since I am confused about your current set up.Sorry but I should have said from the start this is a question about a TT'd shed from a TN-C-S Supplied house.
16mm 2 core XLPE feed.
Perhaps you could explain exactly what is the electrical set up you have now or plan to introduce? Include the devices at the home CU and those at the shed CU.
Also how you have connected one to the other - Split tails - Henley block maybe/hopefully.
Is there a reason you are installing a standalone TT system in the shed. Does it have an extraneous conductive-part such as a metal water pipe?
Is that 50A MCB circuit protected by an RCD in the house CU? If so, your original question would obviously become a bit moot.From the house there is a 10mm twin and earth coming from our CU via a 50a MCB, this goes in to a sarel plastic enclosure (all this was there when we moved in) ... From there we needed a run 60m away to our large shed to supply sockets and lights.
Is that 50A MCB circuit protected by an RCD in the house CU? If so, your original question would obviously become a bit moot.From the house there is a 10mm twin and earth coming from our CU via a 50a MCB, this goes in to a sarel plastic enclosure (all this was there when we moved in) ... From there we needed a run 60m away to our large shed to supply sockets and lights.
Kind Regards, John
Fair enough. I take it that you mean 'all RCBOs' apart from this one MCB. In that case, the RCBOs in yoiu shed would obviously be effectively the same (functionally) as the up-front RCD in any TT system.The house has all RCBOs and the circuit in question is just an MCB
Fair enough. I take it that you mean 'all RCBOs' apart from this one MCB. In that case, the RCBOs in yoiu shed would obviously be effectively the same (functionally) as the up-front RCD in any TT system.The house has all RCBOs and the circuit in question is just an MCB
Kind Regards, John
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