CU Change

[Pete999]

Single pole switched neutral.

N0 sarcasm there Kerry nice one

 

[hightower]

Whoa don't reveal my true identity Pete! How do they abbreviate single pole solid neutral then?

 

[telectrix]

SP. sod the neutral.

 

[gazdkw82]

So what's the benefit is spsn?

 

[hightower]

Neutral breaks too when the line trips, where as solid it doesn't.

 

[gazdkw82]

Neutral breaks too when the line trips, where as solid it doesn't.

Right, so it's safer then.

is installation different?

 

[hightower]

Well on a TT system if you have a neutral to earth fault a solid neutral device will see it and trip but the fault won't be cleared so it will likely take out your time delayed main rcd too.

Be good to see the bus bar of those spsn devices

 

[Pete999]

Right, so it's safer then.

is installation different?

Different bus bar arrangement

 

[davesparks]

So what's the benefit is spsn?

A standard rcbo does not break the neutral, even if it detects a neutral fault. In fact upon detecting a neutral to earth fault a standard rcbo will disconnect the (non-faulty) line conductor, which is a logically ridiculous situation along with the, albeit very slight in domestic, possibility of the N-E fault diverting neutral currents to the point of overloading conductors.


Sent from my iPad using Tapatalk

 

[rolyberkin]

View attachment 32630View attachment 32631SBS trade sales compact RCBO board with dual busbars and to top it off they are SPSN which is a rarity. About £14-£15 an RCBO.

Nice, I had bought a Wylex high integrity board to replace the one in my house. I will now be palming that off on someone else and buying these!

 

[Leesparkykent]

Nice, I had bought a Wylex high integrity board to replace the one in my house. I will now be palming that off on someone else and buying these!

Here are their details if you don't already have them.

 

[Dobes_88]

Are these the same compact RCBO's that were in Professional Electrician a month or so ago...?

Look a very smart bit of kit, am I right in saying they'll retrofit in most exiting CCU's?