Discuss Adiabatic Equation - why only for CPC? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
True but just to be clear, if the conductor is carrying normal current beforehand that just means the starting temperature is higher, so rather then starting from 20c it would start from 70c. Then when the adiabatic ie sub 5s fault event happens, that part is covered by calculating the energy per metre deposited into the cable.It’s no use for conductors intended to carry current for an extended duration.
Have you ever came across a value that was borderline? Most of the time where I am the pfc is so low you could get away with 4mmTrue but just to be clear, if the conductor is carrying normal current beforehand that just means the starting temperature is higher, so rather then starting from 20c it would start from 70c. Then when the adiabatic ie sub 5s fault event happens, that part is covered by calculating the energy per metre deposited into the cable.
If there was a double fault situation where the was an overload that turned into a fault before it was cleared, we might be on shaky ground.
I'm not a spark so i have limited practical experience, but given 100A is the largest bs88 commonly used in domestic my supposition is that it would be ok.Have you ever came across a value that was borderline? Most of the time where I am the pfc is so low you could get away with 4mm
There's no prescribed order for designing your circuits, as long as they comply in the end.You don't work out the cable size using the adiabatic equation
That wouldn't work if you have a fixed load not subject to overload, the nature of the load determines the necessary cable size along with adiabatic.the protective device lets you know what the cable size should be, bigger than.
Reply to Adiabatic Equation - why only for CPC? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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