User's Guide — 37
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 conduc-
tors, the
ElectriCalc LT
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 larg-
est 3-phase 75°C copper service-
entrance conductor being used. What is
the equivalent aluminum size? What is
the equivalent circular mils?
Steps Keystrokes Display
Reset calculator
[Set] [x]
0.
Set cond. temp.
[Set] 7
3Ø 75 Cu 0.
Enter wire size
00 [WireSz]
00 CU
AWG WIRE SIZE
Find grnd wire sz [Grnd]
4 CU
GRND WIRE SIZE
Find alum size
[Grnd]
2 AL
GRND WIRE SIZE
Find circular mils [Grnd]
133,100.
CMIL WIRE
