radial Final circuit definition

[climbingstelly]

i find the definitions on pages 362 363 of the requirements for electrical instalations confusing.

Definition (page 362). Ring final circuit.
A ring final circuit starts and finishes at the distribution board, where it is connected to a 30 A or 32 A overcurrent protective device.

Definition. Radial final circuit.
A radial final circuit starts and finishes at the distribution board, where it is connected to a 30 A or 32 A overcurrent protective device.

I always thought i knew what a radial was until i read this or is it because i bought my new copy of requirements for electrical installations off the internet ?

I class a radial as a circuit that starts at the distribution board finishes elsewhere without a return leg. (not including high integrity). Correct me if i'm wrong please.

help i can't stand being confused.

 

[wingcoax]

You are correct. Also, a radial circuit would normally have a 20a fuse or mcb. Exceptions would be a cooker or shower circuit, which would have a higher rated protection(also a larger cable csa)

 

[OwainDIYer]

i find the definitions on pages 362 363 of the requirements for electrical instalations confusing.

Definition (page 362). Ring final circuit.
A ring final circuit starts and finishes at the distribution board, where it is connected to a 30 A or 32 A overcurrent protective device.

Definition. Radial final circuit.
A radial final circuit starts and finishes at the distribution board, where it is connected to a 30 A or 32 A overcurrent protective device.

I always thought i knew what a radial was until i read this or is it because i bought my new copy of requirements for electrical installations off the internet ?

I class a radial as a circuit that starts at the distribution board finishes elsewhere without a return leg. (not including high integrity). Correct me if i'm wrong please.

help i can't stand being confused.

I think they've done a mistake.

A radial circuit does indeed not return to the distribution board, and a final circuit may be protected by a 20A or 30A/32A protective device if using BS1363 socket outlets, or according to the requirements of the circuit eg 5A/6A for electric lights or 45A for an electric shower.

Unless I'm misunderstanding their terminoligy of course and they've changed what ordinary words mean.

 

[climbingstelly]

Thanks for your replies and confirmation. I qualified as an electrician ( of sorts) 4yrs ago but I don't work as an electrician so im trying to keep things fresh just in case i do decide to take it up. I find if you're not doing it everyday you start to forget stuff or doubt yourself.

 

[OwainDIYer]

Thanks for your replies and confirmation. I qualified as an electrician ( of sorts) 4yrs ago but I don't work as an electrician so im trying to keep things fresh just in case i do decide to take it up. I find if you're not doing it everyday you start to forget stuff or doubt yourself.

I'm still working mentally to 15th Edition!!!