Thanks Cuky for the pdf
But this was for sizing CPC earth conductor. While it is related it is not exactly the same as sizing the phase conductors. But thanks for replying
Thanks dpc
I realise that (i.e. at 5 seconds you comput your own I2t by looking at fuse curve), but I still think this could be made clearer by the fuse manufacturer's. I came across one fuse manufacturer, GEC Alsthom, that made this very clear and even gave the adiabatic formula I2t = k2S2 and...
Hi again
ust noticed the 2 intending to be 'squared' did not come out when I pasted...so 'I2t' should be I squared x t and also '1152 102 = 1322500 A2sec'
should be 115 squared x 10 squared A squared sec
Hi guys (and gals)
You might be able to assist me in relation to a query I have on the maximum let-through energy of fuse versus the thermal withstand energy of cable.
Basically my query revolves around the wording in the ETCI (Irish Regs) and IEE Wiring Regulations that state that fuse I2 t...
The formula I use for knee point voltage Vk if for example we have a protection class CT rated as 30VA 5P50 :
Vk = K (Pint + Pbn) / Is
where : K = Accuracy limit factor (e.g. 50)
Pbn = CT Rated burden (e.g. 30VA)
Pint = Internal CT burden (e.g. 3-10VA)
Is = CT Secondary...
