what wrong with this CU? Quiz

[Iggifer]

Nope, most Square D domestic boards are top fed. The new ones seem to be moving towards the 'norm'.

You still orient the breaker so the switch is down when off, it just means the busbar (it's not really a busbar) goes in the top, and the outgoing cables in the bottom. I kinda like it that way

 

[sparkwright]

How would bode having the two different Square D MCBs next to each other in the same (3 phase) board?

One switch will work the opposite way to the other. Does that matter?

 

[Iggifer]

Do you mean RCBOs? Can't see as it would matter with MCBs, just swap the forks around

 

[sparkwright]

Do you mean RCBOs? Can't see as it would matter with MCBs, just swap the forks around

Not particularly.

How do you mean, the forks?

 

[Iggifer]

Oh no not this again! Haha.

Them forks. As you can see, they fit top or bottom. But with an RCBO obviously you couldn't just swap them round

 

[deadshort]

The rcbo's are reverse polarity.

DS

 

[Iggifer]

The rcbo's are reverse polarity.

Are you sure? looks right to me

 

[deadshort]

No, i am not but due to the op referring to the 'cu' and the quality of picture and the shot in the dark answers i thought what the hell…………

DS

 

[PrenticeBoyofDerry]

From what can be seen, other than the odd exposed copper on live conductors and a couple of mixed devices, but I assume Square D and Schneider are type tested same and the cover being off. Looks fine to me!

 

[securespark]

FWIW, without seeing DS's answer, I was going to post RP earlier.

 

[deadshort]

Where are the functional earths for the Square D rcbo's I can only seen one for the Schneider rcbo ?

DS

 

[sparkwright]

Where are the functional earths for the Square D rcbo's I can only seen one for the Schneider rcbo ?

DS

Not all RCBOs have them.

 

[SimonH2]

Is it something to do with most Square D MCBs being fed from the 'top' of the breaker usually?

You know the type, a typical Square D MCB has the busbar connection at the top, and the circuit wire goes in the bottom.

So if you fit one sideways in a 3 phase board, it may look fine, but the switches will be the opposite way round to what they would normally be?

Except that these are plug-in breakers and only fit one way (unless you start dismantling them).

The main issue I can see is that it clearly wasn't done by a "normal" spark. I thought it was forbidden to label cables or dress them neatly like that
Could that be the issue we're looking for ? The cables are bunched closely together and that'll affect the derating factor to be applied ?

 

[Risteard]

Could that be the issue we're looking for ? The cables are bunched closely together and that'll affect the derating factor to be applied ?

I wouldn't particularly say that they are. The problem is some use an inordinate amount of cable ties on them which obviously reduces the chance of them dissipating heat. Although if the circuits aren't terribly heavily loaded then in practice it's unlikely to be an issue.

 

[333rocky333]

In my view it looks crap,
Id stack the breakers upwards from the main switch on BOTH left and right sides