Why let through energy of cable is calculated and compared against protective device let through energy, when adiabatic equation and disconnection time check is used to verify the cable sizes? or this let thru energy verification is applied only for current limiting breakers / fuses?
Like Mike, I am puzzled by the question, but t is not the maximum disconnection time, which could be 5 s for a distribution circuit. It is rather more instantaneous. How instantaneous and what current may flow depends upon the specific device, which is why manufacturers will quote I²t.
If there is no OCPD plenty of energy will be let through before something else gives!
Like Mike, I am puzzled by the question, but t is not the maximum disconnection time, which could be 5 s for a distribution circuit. It is rather more instantaneous. How instantaneous and what current may flow depends upon the specific device, which is why manufacturers will quote I²t.
If there is no OCPD plenty of energy will be let through before something else gives!
