Grounding Conductor Size Calculator

Inputs

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Rating or setting of the upstream overcurrent device protecting the circuit. If it is between table rows, the next higher row is used.
A
Select the equipment grounding conductor material column.
Installed or proposed wire-type equipment grounding conductor size in each raceway.
Use 100% when ungrounded conductors are not upsized. If phase conductors are doubled in circular-mil area for voltage drop, enter 200%.
%
For parallel raceways, each raceway usually needs a full-sized EGC based on the circuit OCPD. This does not split one EGC across raceways.
raceways

Results

Default result
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Required EGC area(CM_req)
10.38kcmil
Pass

Base #10 AWG copper area x upsize ratio.

Also computed

Suggested listed EGC area(CM_list)Pass10.38kcmil

Nearest listed copper EGC: #10 AWG.

Selected EGC area(CM_sel)Pass10.38kcmil

#10 AWG selected per raceway meets the calculated area screen.

Selected area margin(CM_sel - CM_req)Pass0kcmil

Positive area margin versus the required EGC screen.

Selected utilization(CM_req/CM_sel)Pass100%

Required circular-mil area divided by selected EGC circular-mil area.

Table row used(I_row)60A

Next table row not less than the entered 60 A OCPD.

Base table area(CM_table)10.38kcmil

Base table size before proportional upsizing: #10 AWG copper.

Equipment grounding conductor screen REQUIRED AREA SELECTED AREA #10 AWG suggested #10 AWG selected per raceway
Method notes 3 notes
  • This page sizes wire-type equipment grounding conductors from the upstream breaker or fuse rating. It is not a grounding electrode conductor sizing tool.
  • If the ungrounded conductors are increased in circular-mil area for voltage drop or other reasons, the EGC is screened with the same proportional increase.
  • Final work still depends on the adopted electrical code edition, local amendments, raceway/cable wiring method, conductor material restrictions, equipment listing, parallel-run rules and AHJ interpretation.

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