BS 1363 socket circuit

[haptism]

Does anyone know if its acceptable to have the ocpd of a radial circuit serving only single sockets higher than 32A ?

2 x 6mm would be the most a socket could take so probably 40A OCPD (singles in trunking).

 

[spark 68]

Ok my curiosity has got the better of me why would you want to do that?
Good luck with terminating 2X 6mm^ in most S/Os these days

 

[haptism]

Was waiting for why. Basically there is 5 plug in appliances (totalling 9.3 KW including tea urns, coffee machines, fridge, 2x kettles which a vicar needs to be on simultaneously, once in a while. One circuit would be easier to run than two.

 

[spark 68]

There may be diversity to be applied here, but still I would probably cut that circuit into at least either two RFCs or into two or more radials to suit, especially if you know there is likely to be frequent overloads, not so much the kettles, which maybe only on short term, but more the tea urns and coffee machine which really should be on their own circuits if they are rated at 2kW or more.

 

[The Ghost]

in most S/Os these days

That is a point I am getting frustrated with most s/o these days. The termination point is very reticent even properly accepting 2 x 2.5 leading to a difficult insertion. Curve, Hamilton, and the cheaper brands all seem to have a crap termination point. I took 3 boxes of sockets back last week and got some MK instead at screwfix. I don't think they are fit for the purpose. Bring back the good old days where you had a half inch round hole (ok slight exaggeration!) to double the cables over in. Try doing that now with the modern sockets. I had a trainee working with me after half an hour he could not terminate the sockets properly. I had to exchange them.

 

[haptism]

There may be diversity to be applied here, but still I would probably cut that circuit into at least either two RFCs or into two or more radials to suit, especially if you know there is likely to be frequent overloads, not so much the kettles, which maybe only on short term, but more the tea urns and coffee machine which really should be on their own circuits if they are rated at 2kW or more.

There is a reg I read earlier about water immersed heating elements, but thought it was more concerned with the bigger ones, the tea urns have a plug top on afterall. There would be no overloads if correct ocpd used; but I see your point better 2 or more circuits. Don't MK sockets take x2 6mm??

 

[Deleted member 26818]

Why not just run it as a ring?

 

[haptism]

Why not just run it as a ring?

Yeh could run a ring of 4mm yes. I was more concerned thou about socket circuits with a ocpd of over 32 A as its unorthodox.

 

[spark 68]

Certain ones may do, I couldn't swear to what does what these days
but still it is perceived as a 'bad design' when a typical RFC is designed for 32A only, it may lead to queries and condemnation by future sparks down the line , seriously though I would stick to conventional circuits where possible

 

[Deleted member 26818]

A Ring Final Circuit uses a protective device which is rated 1.5 X the CCC of the conductors.
So 45A MCB, requires conductors with a minimum CCC of 30A.

 

[spark 68]

Oh I am not arguing spin ffs we have had people on here who disagree with SB and lowering Zs, or think it is dangerous ffs, never seen a lollipop circuit before, trying to invent even more regs the list goes on and on! welcome to the new breed of "super sparks"
IMO, and it is only an opinion, it is better not to deviate at all unless there is no other option.

 

[haptism]

Certain ones may do, I couldn't swear to what does what these days
but still it is perceived as a 'bad design' when a typical RFC is designed for 32A only, it may lead to queries and condemnation by future sparks down the line , seriously though I would stick to conventional circuits where possible

Yeah I cant argue with that

A Ring Final Circuit uses a protective device which is rated 1.5 X the CCC of the conductors.
So 45A MCB, requires conductors with a minimum CCC of 30A.

You what Spin

 

[spark 68]

Actually there may be something in the BS1363 standard as well that precludes this, however I don't have access to that standard so don't quote me on this

 

[shaun1]

As an alternative could you put a small local sub DB in and run 2 Rings / 4 radials?

 

[Chris]

Oh I am not arguing spin ffs we have had people on here who disagree with SB and lowering Zs, or think it is dangerous ffs, never seen a lollipop circuit before, trying to invent even more regs the list goes on and on! welcome to the new breed of "super sparks"
IMO, and it is only an opinion, it is better not to deviate at all unless there is no other option.

I hope you aren't referencing me and my post on lollipop circuits the other day
Working in a housing association where every house is wired to a spec i had never came across one before in my 6 years (4 of them apprenticeship) time at the company, only on work i was carrying out for myself.
I dont recall referring to myself as a "Super spark" but thank you for the compliment

To quote a chinese proverb..

"He who asks a question is a fool for five minutes, he who does not ask a question remains a fool forever"

I also know what a lollipop circuit is now too