EGC Size Correction Calculator

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EGC Size Correction Calculator

Conductor Type

OCPD Type

Motor Inputs

Motor Type

Motor FLA

Effective Breaker or Fuse Size Per NEC 250.122(D)(2)

Conductor Inputs

Breaker or Fuse Size

Minimum Phase Conductor Size (Sufficient Ampacity)

Minimum Conductors Per Phase (Sufficient Ampacity)

Actual Phase Conductor Size

Actual Conductors Per Phase

Calculation Results

Minimum Conductor Cross-Sectional Area (CM)

Minimum Combined Conductor Cross-Sectional Area (CM)

Actual Conductor Cross-Sectional Area (CM)

Actual Combined Conductor Cross-Sectional Area (CM)

Minimum Equipment Grounding Conductor (EGC)

Minimum Equipment Grounding Conductor (EGC) Cross-Sectional Area (CM)

% of Conductor Cross-Sectional Area from Minimum to Actual

Minimum Corrected Equipment Grounding Conductor (EGC) Cross-Sectional Area (CM)

Corrected Equipment Grounding Conductor (EGC)

Corrected Equipment Grounding Conductor (EGC) Cross-Sectional Area (CM)

NEC Section 250.122 (B) states:
If ungrounded conductors are increased in size for any reason other than as required in 310.15(C), wire-type equipment grounding conductors, if installed, shall be increased in size proportionately to the increase in circular mil area of the ungrounded conductors.

Exception:
Equipment grounding conductors shall be permitted to be sized by a qualified person to provide an effective ground fault current path in accordance with 250.4(A)(5) or (B)(4).