48 — ElectriCalc Pro
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 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 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
[On/C]
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
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