Supply for utility room from upstairs ringmain + a further question

[nunesal]

Hi
My last post was to simply clarify that that I did not add a circuit as there seemed to be some doubt and also to state that the routing of the cables was correct

As mentioned earlier:

The ideal situation would be to have all circuits protected individually by RCBOs, but to comply to the regs, in your situation you need to protect newly buried cable and newly installed sockets by 30mA RCD.
As you already have an upfront RCD, it would be difficult/impossible to prevent complete loss of power if that device trips.

But it would be expected that a 30mA device would discriminate over a 100mA device.
It would be best to protect sockets circuits individually with 30mA, but BS7671 (wiring regs) could allow for them both to be on the same 30mA RCD, providing lighting circuits are not.

I am getting an electrician as I want to fit the 30mA RCDs for the circuits as suggested to me (as my current one is 100mA anyway) or even fit RCBOs if possible. That was the reason for evaluating the propsective RCBO costs. My post confirms this:

However, is it possible to fit RCBOs in my situation as you suggest without changing the CU? I need to look at costings. Alternatively, any suggestions, given the 3 socket circuits I have for additional 30mA RCDs?

Perhaps there was some misunderstanding here.

Thanks

 

[PrenticeBoyofDerry]

No misunderstanding on my behalf. I understand that you are replacing cable that is not designed correctly for the circuit to accommodate sockets for three appliances (2 DG and 1 SG)
As far as safe ones/permitted cable routes
https://www.diynot.com/wiki/Electrics:walls

 

[nunesal]

The Sparky has been in to look at the setup. He will fit 2 off, 30mA RCDs for the upstairs and downstairs power sockets. He is also looking at the annexe circuits, as space is limited in the fuse board cupboard.

I understand that you are replacing cable that is not designed correctly for the circuit to accommodate sockets for three appliances (2 DG and 1 SG)

It is correct that I need supply for 3 appliances, but the sockets into which they are to be plugged, have power from different origins, ie, 1 from upstairs ring JB and the other one from downstairs ring JB. One socket will take a WM and fridge and the other will take the TDryer. My original query was about the upstairs ring supplying downstais socket and whether this was OK, as quoted below:

So the supply for this spur is from upstairs. My question is: a) I know this is not the best scenario, but can I leave this connection as it is or do I have to remove the cable? The work looks 'professionally' done and neat. The socket is intended to supply power to a new fridge/freezer and a washing machine. I intend to label the CU/new socket to state the source of power supply. b) Is this legal?

Where there maybe confusion is about the old broken socket which I am replacing:

I feel I need to change the cable from the junction box to the new socket in the utility room for 2.5mm T&E. This is for use on a tumble drier or washing machine. Is this acceptable?

In conclusion, 3 appliances in total (WM, TD, and fridge/freezer) in the utility room but supplied from 2 separate sockets from different ring supplies. The sparky is looking into this when he gets into the loft.

Thanks for the permitted cable route diagramlink.