two radials into an RCBO

[John-SJW]

No spare ways in the consumer unit. There are two low current radials on their own RCBOs. Do the regs forbid putting the two radials onto the same RCBO - that is two L wires into the one RCBO?

 

[timhoward]

Point out what you do not understand.

As a fellow university graduate, please can you stop saying this bit as it doesn't come over well.
"Can you help me understand how a final circuit can be interpreted this way?" might be more appropriate.

 

[John-SJW]

As a fellow university graduate, please can you stop saying this bit as it doesn't come over well.
"Can you help me understand how a final circuit can be interpreted this way?" might be more appropriate.

I feel like I am talking to a bunch of 7 year olds in how to get a grasp of English.

 

[John-SJW]

As another university graduate, with a smattering of law amongst the technical stuff, who had to extensively use and read English in studying and professionally all my life, I also know simple English, and you are misinterpreting this.

The text:

314.4 Where an installation comprises more than one final circuit, each final circuit shall be connected to a separate way in a distribution board.

Show where your are stuck in the above text?

 

[John-SJW]

The regs are an imperfect painting-by-numbers scheme that if followed ought to result in an installation that complies with the statutory requirements of other legislation. They aren't statutory in and of themselves though. Not following one is not always breaking the law.

I would happily stand up in court and defend two typical lighting circuits in an RCBO as being electrically safe, especially given the considerably lower loadings of many LED infested lighting circuits these days, usually considerably lower than the original design anticipated.

I'd never stand up in court and defend a boiler radial in with a sub main as we're mixing final and distribution, wrong OCPD for boiler, and wildly different functions which could lead to incorrect isolation attempts.

The 2nd sentence in that reg says "The wiring of each final circuit shall be electrically separate from that of every other final circuit, so as to prevent the indirect energizing of a final circuit intended to be isolated"

I can understand anyone saying this is black/white and choosing not to do it.
I can also understand anyone saying "the spirit of that reg is grouping functions together for clarity and safe isolation".
If you can summarise a circuit easily e.g. "Lighting 1st/2nd Floor" and the loading is suitable there is no reason why they can't be combined. Where they are combined is really not worth this degree of argument/upset.

The second sentence says each circuit must be fully independent, that's all.

Spirit does not matter, only hard words, which say:

314.4 Where an installation comprises more than one final circuit, each final circuit shall be connected to a separate way in a distribution board.

 

[westward10]

I feel like I am talking to a bunch of 7 year olds in how to get a grasp of English.

You cannot help yourself thread closed.