Extending ring final circuits

[Richard Measures]

Hi. I have a CU move to do - around 5m from current location. There are 10 circuits, 4 of them ring finals.
I'm considering whether to extend the rings 'as are', or to split the rings somewhere in their approximate middles and extend them to separate RCBOs as radials, the aim being to reduce the effect on the installation of any individual RCBO trip.
Seems like a plan to me - although it doesn't reduce the amount to cables to be extended and does add labour in identifying the rings.
Am I missing anything?

 

[Andy78]

So you want to split each ring circuit in half to form 8 radials from 4 rings ? Seems like a lot of work for no benefit. Are tripping problems existing or expected ?

 

[Des 56]

If there are tripping issues that is driving this decision then there are other circuit problems that need attention and priority
If there are no tripping issues,same as Andy "a lot of work for little or no benefit
You may also have to assess the would be radials to be better balanced for likely use than just breaking at the centres

 

[telectrix]

Hi. I have a CU move to do - around 5m from current location. There are 10 circuits, 4 of them ring finals.
I'm considering whether to extend the rings 'as are', or to split the rings somewhere in their approximate middles and extend them to separate RCBOs as radials, the aim being to reduce the effect on the installation of any individual RCBO trip.
Seems like a plan to me - although it doesn't reduce the amount to cables to be extended and does add labour in identifying the rings.
Am I missing anything?

are you moving CU or fitting new? if new will it be dual RCD or RCBO?

 

[Richard Measures]

New CU. Leaning towards full RCBO now they’re coming down in price. Not much more than a 22way split RCD nowadays...

 

[telectrix]

hen fit a din rail box in current CU location and extend cables as is. i.e. preserve the 4 RFCs. to make life easier, you could run 6.0mm from new CU to each RFC in the din rail box. so you'd have 4 x 6mm instead of 8 x 2.5mm from CU to din rail. basically lollipop circuits,