Ring final & Radial circuits off one mcb ?

[Soulsurfer]

Another straight forward job today has turned out to be a right mess once again so I thought I'd get some thoughts on the following before I start !

So an old MK LN59 board, feed to garage sockets on a single 2.5mm t&e from a 15A mcb and also spurred to feed a boiler on S plan,

Next ring final on a 30A feeding upstairs sockets as usual but on cover removal I found a 4mm t&e spurred from same 30A mcb and feeding opposite side of garage to sockets all on the 4mm then at the end spurred from last socket with 2.5mm t&e to feed new water cylinder via a DP switch !

Obviously I'm not happy with the 4mm being spurred as an extra circuit from a separate circuit pd but surely the immersion being spurred from sockets is rough too ?

Never seen anything like that before !

 

[Deleted member 26818]

Oh the joys of Part P.
Options install a new circuit which has to be notified, or connect to an existing circuit, which doesn't have to be notified.
Options install new CU which has to be notified for new circuit which also has to be notified, or connect to existing circuit which doesn't have to be notified.
All comply with the Wiring Regs. and Statutory requirements, though some options are cheaper than others.

 

[Leesparkykent]

Was some time last year when I joined the forum went on for days. I read Reg 314.4 to mean two final circuits should have individual circuit protection and I won't sway from that. In the OPs case and probably nearly every situation like this a new circuit has just been tagged onto an existing circuit even if spare ways are available, to me the intention has been to create a new circuit and by connecting in this manner does not suddenly mean the two circuits now become one. To me this is just poor installation methods.

Would you class smoke detectors and lighting wired separately but on the same OCPD as "poor installation methods"?

 

[westward10]

Yes.

 

[Leesparkykent]

Yes.

comical.

 

[davesparks]

Was some time last year when I joined the forum went on for days. I read Reg 314.4 to mean two final circuits should have individual circuit protection and I won't sway from that. In the OPs case and probably nearly every situation like this a new circuit has just been tagged onto an existing circuit even if spare ways are available, to me the intention has been to create a new circuit and by connecting in this manner does not suddenly mean the two circuits now become one. To me this is just poor installation methods.

I agree that this is a dodgy job, they may as well have open end up the ring and extended it to serve the new sockets.

But what I am interested to know is how you are defining what is a circuit.

 

[Wilko]

Would you class smoke detectors and lighting wired separately but on the same OCPD as "poor installation methods"?

This doesn't phase me (plagarism, sorry) as the cables are likely to be the same size (if I did it ) and IMHO from mcb they form one radial circuit with multiple branches. But the OP's 4mm radial in bed with a 2.5mm rfc at 32A mcb just doesn't seem right to me.