Splitting rings ?

[Gees]

Is there anything stopping me from having my rings split into radials?
I intend having RCBO's fitted as I have had a lot of nuicance tripping.
Should Ihave 20A "b" types fitted to each circuit ?
I have three rings at the moment and have some spare ways in the CU.

 

[flameport]

20A RCBOs will probably be suitable, depending on what size cables are used and how they are installed.
Another option is could be keeping the rings and fitting 32A RCBOs.
However before that, it is essential to find out why the existing RCD(s) are tripping, as this could indicate one or more faults.

 

[Gees]

It's 2.5 twin and earth throughout. I just had the CU replaced and the test sheets are absolutly fine. I have just replaced my washer / drier and dishwasher with Bosch units and have had a guy out to insulation test these new items. All tested OK. It could possibly be the CH boiler but again insulation tests where fine. When this started to happen I got the spark to have another look but he could not explain why the fault was occuring.
I am on A TT with overhead concentric supply, 10mm main earth and bonding ( 2 earth rods and Ze of 22 ohms )
I have also got a new electric kettle and the cooker is gas>>>

 

[spark1]

Are these rings you intend on splitting supplying any fixed heating loads or kitchen outlets........if they are then do not split them.

 

[Gees]

Are these rings you intend on splitting supplying any fixed heating loads or kitchen outlets........if they are then do not split them.

There is a dedicated kitchen / utility room ring as well as the upstairs and downstairs rings. The tripping is on the RCD that is NOT supplying the kitchen so that one could be left alone. I do run a fair amount of IT kit here, spread over the two rings and maybe there is just too much leakage from all the switch mode supplies? If I have the rings made into radials that may well solve the problem as effectivly I will be doubling the amout of allowable leakage by having 2 30ma circuits instead of one..

 

[spark1]

The tripping is on the RCD that is NOT supplying the kitchen


...from your previous post you were indicating you did originally suspect the appliances in thr kitchen ??????.

...You need the help of a decent Spark...maybe utilising a low reading clampmeter.

 

[Gees]

The tripping is on the RCD that is NOT supplying the kitchen


...from your previous post you were indicating you did originally suspect the appliances in thr kitchen ??????.

...You need the help of a decent Spark...maybe utilising a low reading clampmeter.

the appliances where replaced before the CU change.
I'll get the spark back for another look. Thanks

 

[skenk]

Just how 'fine' are the test sheets? Absolutely perfect by any chance? How long did the spark take to do the testing and how many circuits? and how big a house?

Big house with 3 rings and lots of lights will take a while to test properly.