Calculated Industries 5070-B User Guide - Manual (Page 45)

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GROuND CONDuCTOR WIRE SIZE
You can use single or multiple service entrance conductor(s) to find
the grounding electrode conductor for AC systems. When using
multiple conductors, the ElectriCalc Pro uses the equivalent Circular
Mils to find the Grounding electrode conductor (based on NEC
Table 250.66).
Find the Grounding electrode conductor Wire Size required when
2/0 is the largest 3-Phase 75°C Copper service-entrance conductor
being used. What is the equivalent Aluminum size? What is the
equivalent Circular Mils?
KeysTRoKe DIsPlay
  0.
1. Enter Wire Size and find Ground Wire Size:
  
GRnD 4 Cu
WIRe sIZe
2. Find Aluminum size:

GRnD 2 al
WIRe sIZe
3. Find Circular Mils:
 CMIl 133,100.
WIRe
4. Display NEC Table:

neC 250.66
* Wire size can also be entered in Circular Mils (e.g.,
       enters 133,100 CMILs and displays 4 GRND
Wire Size). If Wire Size is not entered using the  key, the
calculation will be based on the Wire Size stored in the  key.