Waterproof rcd

[Adam_151]

It's effectively an RCBO, but the MCB and RCD are separate items, overcurrent trips the MCB, current imbalance trips the RCD, but resetting one has no effect on the other, which is why the RCD has both test and reset buttons.

I presumed all the breaking was done by the MCB, and that the earth leakage part triggered it internally by the pins that can slot between devices, and that you had to reset the earth leakage part before you could close the MCB again.

Similar to the Vigi units on merlin MCBs in the 90s, or the equivelent you still got for MCCBs when you need an RCD rated in the hundreds of amps (such as on large commericial sites that cannot use the TNCS earth, such as petrol stations or caravan parks)

But using that 40A RCBO as the DB incommer is going to involve wire links and an ad hoc neutral block, I cant believe they send them out with the expectation that its going to need a bit of a bodge to install... (actually I can, but you know what I mean)

 

[bouh13]

Lesson learned I’ll get my arse down to screw fix lol

Thanks for the advice when it arrived I thought it

 

[bouh13]

I thank you all very much for your advice. I had a feeling I was going to have to get a neutral bar and fit that so I’ve decided to take your advice and get a decent one. I shall be returning this piece of junk back to China

 

[JohnW2]

It's effectively an RCBO, but the MCB and RCD are separate items, overcurrent trips the MCB, current imbalance trips the RCD, but resetting one has no effect on the other, which is why the RCD has both test and reset buttons.

Thanks. I must admit that (at least partially because I cannot read Chinese!) I hadn't realised that was a reset button!

I suppose that arrangement does have something to be said for it since, as we quite often discuss, one of the few (and small) downsides of RCBOs is that they can somewhat hinder fault finding - since when (with 'standard' ones) one operates, one doesn't know whether it was the result of overcurrent or residual current.

Kind Regards, John

 

[EFLImpudence]

It's effectively an RCBO, but the MCB and RCD are separate items, overcurrent trips the MCB, current imbalance trips the RCD, but resetting one has no effect on the other, which is why the RCD has both test and reset buttons.

As John has said, it shows whether overload or earth leakage was the cause, but is that the sole reason for such an arrangement?

Why bother? You can have a separate MCB and RCCB.

 

[JohnW2]

I presumed all the breaking was done by the MCB, and that the earth leakage part triggered it internally by the pins that can slot between devices, and that you had to reset the earth leakage part before you could close the MCB again.

I must say that that is was I also imagined, but flameport appears to know better.

What you and I thought would seem in some senses more credible, because one would hope that, if the RCD had it's own independent switching (as flameport implies) it would be such as to need 'mechanical re-setting', not just 'pressing a button' which did something electronically.

Kind Regards, John

 

[Taylortwocities]

Lesson learned I’ll get my arse down to screw fix lol

Thanks for the advice when it arrived I thought it

Bear in mind that you are installing a new consumer unit and (I suppose) connecting new circuits to it.
Both of those activities are notifiable to LABC.