Single Pole RCBO in TT with Time Delay RCD Incomer

[spark 68]

See the smiley on the end Dave , what with the earlier semantics, plus a discussion on the IET site I was involved in the other day someone else made the point that SPSN could apply to solid N types

Semantics, shemantics lol

 

[Simlec]

Is it not 1P RCBO means fixed neutral and only operates Line conductor
1P+N RCBO means RCD part operates the line & N but overload only operates line not Neutral

 

[spark 68]

1P+N RCBO means RCD part operates the live & N but overload only operates line not Neutral

This is basically what I described as a SPSN type the other day on the IET site

 

[davesparks]

Is it not 1P RCBO means fixed neutral and only operates Line conductor
1P+N RCBO means RCD part operates the line & N but overload only operates line not Neutral

No, there is a standard nomenclature as I mentioned in an earlier post.

 

[Simlec]

No, there is a standard nomenclature as I mentioned in an earlier post.

Best let Hager know then.

RCBO Single Pole & Switched Neutral RCBOs

 

[D Skelton]

No, the nomenclature is pretty well defined.

Oooooooh! Using big words now are we Dave?!

 

[Craig Rogers]

Thanks for all your help guys.

The RCBO is just a single pole so I'm organising it to be changed to a double pole. Luckily there is space in there for a 2 unit one.

I'm beginning to suspect that the time delay RCD is a bit trigger happy (faulty) so I'm getting that swapped out too.

 

[Knobhead]

Best let Hager know then.

RCBO Single Pole & Switched Neutral RCBOs

Look at the right page
RCBO Domestic RCBOs

 

[Simlec]

Look at the right page
RCBO Domestic RCBOs

I did and that's why they are listed as 1P

 

[D Skelton]

I'm beginning to suspect that the time delay RCD is a bit trigger happy (faulty) so I'm getting that swapped out too.

And you're basing that suspicion on what? A hunch?

Maybe testing it would be the way to go first? But then what do I know?!

 

[spark 68]

Another like from me today Rommel people will begin to talk lol

You are being far too sensible

 

[D Skelton]

Indeed, far too sensible lol.

If you were to ask me, I'd rather be acting like an idiot as per normal!

 

[Engineer54]

SPSN and SP+N mean the same thing!! I have always used the term SP+N myself when describing SP RCBO's that switch the neutral as well as the line conductor.... Basically boils down to different manufacturers using one or other of the above terms....

 

[Engineer54]

And you're basing that suspicion on what? A hunch?

Maybe testing it would be the way to go first? But then what do I know?!

He hasn't tested anything, because he is a telecoms technician and hasn't the test equipment to test the existing installation. So he's first course of action should be to get this electrician he talked about in to check/test the installation, especially the existing RCDs and to then listen to the advice of the electrician as to what needs to be done to rectify his present situation. He can always come back to check/confirm the electrician advice.

This thread should have been posted in the DIY section....

 

[Simlec]

SPSN and SP+N mean the same thing!! I have always used the term SP+N myself when describing SP RCBO's that switch the neutral as well as the line conductor.... Basically boils down to different manufacturers using one or other of the above terms....

The SP RCBO only switches the live, and should not be used on a TT system.
There is a SP with solid neutral (this the common one) & SP with switched neutral.
& yes manufacturers do label them with differing terms.

 

[Craig Rogers]

Yes, of course it'll all be tested out, I was just satisfying my thoughts around it all. Although I'm not going to replace/test anything, its good to be clued up on what's going on. I didn't put it in the diy section as this certainly isn't diy. I'm getting it all checked later this evening.

 

[Risteard]

No, the nomenclature is pretty well defined.

SP (or SP+N) single pole (solid neutral)

Hager single pole switched neutral RCBOs are marked 1P+N.