* Short-circuit current calculation in an insulated conductor.
- When selecting a cable, did you consider the short-circuit current that can withstand without damage?
- NEC 2011, 110.10 Circuit Impedance, Short-Circtuit Current Ratings, and Other Characteristics.
The overcurrent protective devices, the total impedance, the equipment short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without extensive damage to the electrical equipment of the circuit. This fault shall be assumed to be either between two or more of the circuit conductors or between any circuit conductor and the equipment grounding conductor(s) permitted in 250.118. Listed equipment applied in accordance with their listing shall be considered to meet the requirements of this section.
- If a short-circuit current a wire can withstand is less than the rating of the protective device, such wire could be damaged or destroyed in case of failure, therefore it might by rejected by the authority having jurisdiction.
- This App will help you find the maximum short circuit current that a wire can withstand without causing damage to its insulation.