BS 1363 socket circuit

haptism · Mar 2, 2019

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).

littlespark · Mar 3, 2019

How’s the vicar doing his teas and coffees just now? Extension leads off extension leads probably.
Individual radials for highest power items. 2.5 rfc for less with regular 32A ocpd.
Easier to install, easier to terminate. And 2.5 costs less than 6mm

Pete999 · Mar 3, 2019

haptism said:
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).

Question is, why would you want to? Appendix 15 BS7671

telectrix · Mar 3, 2019

2 x 6mm radials.

Toneyz · Mar 3, 2019

Vortigern said:
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.

I remember when I started out in the 80's using contactum with large bellmouth terminals that could take 2 x 6mm cables.

Toneyz · Mar 3, 2019

Pete999 said:
Question is, why would you want to? Appendix 15 BS7671

The concern for me doing an R.F.C. with larger cables and the protective device would be the current carrying capacity of the terminals although they should be able to take 32A minimum.

KEV 1 N · Mar 3, 2019

littlespark said:
How’s the vicar doing his teas and coffees just now?

[ElectriciansForums.net] BS 1363 socket circuit

Norah Nabino · Mar 10, 2019

9.3kw

haptism said:
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.

9.3KW

haptism said:
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).

With 9.3KW ,Ib=40.4a so In >=40a
It>=43a assuming ambient temperature is 35°c.
If you use reference method A (enclosed in conduit in an insulated wall) you are going to end up with a10mm cable which i think is expensive and difficult to terminate in a radial.
So i suggest you split the load into 2 radial circuits with Ib = 20a each wiring in 2.5mm.You can use 4mm as well with the same ref.method which is also expensive compared with the 2.5mm.

haptism · Mar 10, 2019

Norah Nabino said:
9.3kw

9.3KW

With 9.3KW ,Ib=40.4a so In >=40a
It>=43a assuming ambient temperature is 35°c.
If you use reference method A (enclosed in conduit in an insulated wall) you are going to end up with a10mm cable which i think is expensive and difficult to terminate in a radial.
So i suggest you split the load into 2 radial circuits with Ib = 20a each wiring in 2.5mm.You can use 4mm as well with the same ref.method which is also expensive compared with the 2.5mm.

Its singles in conduit run surface, 6mm singles can then handle 40A. Diversity of the appliances brings the Ib to less than 40A.