wiring rcbo in dual rcd cu

[SimpleSimon]

I'm thought I read somewhere that the smoke alarms need their own circuit if the lighting circuits are on a rcd? is this right?

Think this is one of those that are contradicted down the line. Somewhere is says you can take it off a lighting circuit, somewhere it says it can't be RCD protected because of nuisance tripping, though I dont understand where you would get nuisance tripping?

 

[IRB]

So whats the best way to go about it using the board mentioned?

 

[topquark]

i think you have that the wrong way round
http://www.electriciansforums.net/i...s-con-unit-question-17th-ed-2.html#post191298

I meant exactly what I said. I am agreeing that the advice is as hifly suggested and quoted page 66 as citing that. However I still recall reading some conflicting advice recently.

 

[Spudnik]

The recommendation for not putting fire detection on an RCD is mainly down to full, dedicated systems and not domestic smokes.

If that makes sense.

You have no option than to put the circuit with the downstairs lighting for example. You cannot really have an RCBO on an already RCD protected CU. There will be no discrimination between the two.

 

[topquark]

The "best" way would be to substitute one of the RCD's with the necessary number of RCBO's. As that provides the most flexibility and safest option IMHO.

 

[Deleted member 19807]

use radio linked alarms and wire them into a local lighting point, easy job.

 

[Des 56]

i think you have that the wrong way round

Sorry topquark,I should have read up on the earlier posts
I got things the wrong way round reading your post in isolation

 

[thewetspark]

I always use the hall loop to supply the smokes loop in domestic. It's the alternative recommended way, to me best as it stop anyone using the breaker to turn off nuisance trips and stops them hooking the extra wire out of the breaker if you piggyback into a lighting breaker.

 

[IRB]

The start of the smokes will be in the basement

 

[eddielarge]

Im with hifly use the lighting circuit as you will always know if its tripped, where as if it on its own rcbo u might not notice that its tripped, Nic accept it as well

 

[topquark]

The recommendation for not putting fire detection on an RCD is mainly down to full, dedicated systems and not domestic smokes.

If that makes sense.

Ah that makes sense, thanks Jason.s

 

[topquark]

Just done some digging around and found this on the hager site:
http://download.hager.com/hager.uk/files_download/guides/consumer_unit_guide.pdf

Not a complete picture but may help, have a peek at page 11.

 

[IRB]

My heads battered now lol

 

[Spudnik]

My heads battered now lol

Basically, if you can get to a lighting circuit loop somewhere, use that, its perfectly acceptable.

 

[eddielarge]

just as jason said,, and just hope the sparks before u didnt use 2 plate