38 — ElectriCalc LT
Equipment Grounding
Conductor Wire Size
The [Set] [Grnd] keystroke can be used
to find the grounding conductor size for
raceways and “over-current devices in
circuit ahead” equipment. The calculator
uses the displayed amperage value to
solve for the equipment grounding con-
ductor based on NEC Table
250-122.
Find the equipment grounding conduc-
tor size required when the circuit-
breaker is rated at 45 amps and 90°
copper is being used in the installation.
What is the equivalent aluminum size?
Steps Keystrokes Display
Reset calculator
[Set] [x]
0.
Set cond. temp.
[Set] 9
3Ø 90 Cu 0.
Enter amp rating 45 [Amps]
45. AMPS
Find equip. grnd.
wire size
[Set] [Grnd]
10 CU
EQPG WIRE SIZE
Find alum size
[Grnd]
8 AL
EQPG WIRE SIZE
