NEC Cable Sizing Calculations

This section details the NEC 2011standards for De-rating factor, Voltage Drop, Short Circuit, Earth Fault and Cable Temperature calculations.

Reference NEC standard tables used for Core Sizes and Current Rating

NEC standard - Table 310.15(B) 16 and Table 310.15(B) 21

The core sizes and current ratings of cables are used in the equations to calculate the voltage drop, and cable sizes under short circuit and earth fault conditions.