New build

[flameport]

The words 'new build' explain everything.

Cheap rubbish slung in by the 8th level subcontracted unskilled labour.
Tested and inspected by no one.

 

[EFLImpudence]

If only they were cheap.

 

[Risteard]

And that RCD needs to be double pole too

Also correct, or four pole for a three-phase EVSE installation.

 

[Risteard]

Are there any RCDs which are not DP?

Many RCBOs aren't. An RCBO is an RCD as per the definitions.

 

[JohnW2]

Many RCBOs aren't. An RCBO is an RCD as per the definitions.

That's obviously true. I imagine because of 'CU space considerations, most RCBOs have only SP switching (even though it probably would cost very little more to make the switching DP).

However, as I'm sure you understood, I was not talking about RCBOs (which, as you say, are Residual Current Devices), but about devices which only have residual current functionality (which many call" RCCBs'', even though I'm not convinced that RCBOs do not also qualify as that!) which seem to invariably have DP switching.

 

[Murdochcat]

.

 

[Risteard]

That's obviously true. I imagine because of 'CU space considerations, most RCBOs have only SP switching (even though it probably would cost very little more to make the switching DP).

However, as I'm sure you understood, I was not talking about RCBOs (which, as you say, are Residual Current Devices), but about devices which only have residual current functionality (which many call" RCCBs'', even though I'm not convinced that RCBOs do not also qualify as that!) which seem to invariably have DP switching.

RCBOs aren't RCCBs. RCD is the umbrella term, but an RCCB does not have overcurrent protection so can be used to distinguish between RCCBs and RCBOs. That's why I tend to use the term RCCB to refer to those devices.

 

[JohnW2]

RCBOs aren't RCCBs. RCD is the umbrella term, ...

Indeed, but it's an umbrella term which simply means Residual Current Device, and Residual Current Circuit Breaker is not really very different from that.

Although some 'conventions' seem to have been established, "RCCB" doesn't really 'say' that there is not some functionality in addition to that related to residual current any more than "RCD" does- although, as you say, everyone seems to accept that RCBOs are "RCDs"..

but an RCCB does not have overcurrent protection so can be used to distinguish between RCCBs and RCBOs. That's why I tend to use the term RCCB to refer to those devices.

Fair enough - but I think it remains the case that many (most?) people, including the greater majority of non-electricians call them "RCDs". I suppose one can'tr particularly blame them, given that the great majority of wholesalers and retailers also seem to use that terminology.