The object of this paper is to demonstrate with a fairly
simple example problem the use of AmpCalc for Windows. By using one of the
standard NEC Code ductbank configurations, insight can also be gained into the
manner in which the NEC assigns ampacity ratings to the cables in a ductbank.
Refer to the figure below which illustrates the ductbank
configuration utilized in this example. This configuration is identical to the
six raceway ductbank in the IEEE Standard S-135 and in Figure 310-1, Detail 3,
of the NEC Code.
Underground ductbank configuration for Example Problem.