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Current-currying conductor in cable

Question asked by giacomo.gasparini on Jul 19, 2018
Latest reply on Sep 3, 2018 by giacomo.gasparini


in a multiple-conductors cable the load is unbalanced among the conductors: which wires should be considered "current-carrying" conductors?


E.g.: a jacketed cable with 7 identical wires; for the specific application 4 wires are "power" wires (each loaded with 8A), the other 3 wires are "signal" wires (loaded with <100mA current). The signal wire current is some order of magnitude less than power wire current.


Which should be the number of current-carrying conductors in this case to determine the correction factor of Table 12.5.5(b), NFPA 79?

Thank you.

Giacomo Gasparini