User`s guide

User’s Guide — 49
Equip. 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 calcula-
tor uses the displayed amperage value
to solve for the equipment grounding
conductor 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 [On/C] 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
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