Lollipop circuit on a 40A RCBO

[Octopus]

So from the graph we can see that 1x5mm cable could take 42.5A. If 2x2.5mm in parallel can take more than that due to being able to dissipate heat more efficiently than 1x5mm then its CCC is more, so in answer to Murdochs question (regulation's aside as stated by Mr DS) it should be a C3 as its not dangerous??

Although its a ring with many points coming off of it (which could be very unbalanced) rather than just one end load (so not strickly speaking in parrallel as E54 showed), so perhaps it is a C2 as we cant assume the CCC>42.5A??

Glad we've cleared that up :smile5:

My rational is that the routing of the cable is unknown and that leaving the 40A RCBO in place "could" be dangerous and hence my view that the C2 was appropriate. My thinking was mainly on the fact that its the kitchen with the usual appliances connected including a hob and a cooker (both plugged in).

An interesting debate all the same

 

[D Skelton]

My rational is that the routing of the cable is unknown and that leaving the 40A RCBO in place "could" be dangerous and hence my view that the C2 was appropriate. My thinking was mainly on the fact that its the kitchen with the usual appliances connected including a hob and a cooker (both plugged in).

An interesting debate all the same

That argument is just as applicable to a 32A MCB

 

[Octopus]

That argument is just as applicable to a 32A MCB

Hum... but when did you last wire a RFC in 2.5mm T&E and use a 40A breaker?