Disclaimer: RacewayIQ is an informational engineering tool only. All calculations must be independently verified by the user. Do not rely on these results as the sole basis for design, procurement, installation, construction, permitting, or code compliance decisions.

Equipment Grounding Conductor Sizing Calculator

Size a preliminary wire-type equipment grounding conductor from the upstream overcurrent protective device rating or setting and conductor material.

Job Information

Project nameLocationPrepared byDateNotes

Main Inputs

Grounding calculation typeThis calculator currently sizes wire-type equipment grounding conductors only.ModeFind the minimum listed size or check a proposed equipment grounding conductor.OCPD input modeStandard upstream OCPD rating or setting (A)Use the rating or setting of the breaker, fuse, or upstream overcurrent protective device ahead of the equipment or circuit.Equipment grounding conductor materialSelect the material for the wire-type equipment grounding conductor being sized.EGC code-basis reviewThis does not switch the sizing table. Any non-2023 selection adds a verification warning and records the review basis in the report.

Advanced Inputs

Use these when the job has project-specific assumptions, manufacturer data, or review conditions.

Ungrounded conductors upsized for voltage dropParallel raceways or cable assembliesFlexible raceway or flexible connection involvedSeparately derived systemMetal raceway used as equipment grounding pathSpecial equipment or manufacturer grounding requirement

Result

Review

Overall status

Preliminary Size - Verify

Minimum wire-type EGC size

8 AWG Cu

Entered OCPD rating / setting

100 A

Applicable table row

100 A

EGC material

Copper

EGC code-basis review

2023 NEC

Practical Next Steps

Treat this as a workable planning result that still needs review.
Resolve warnings that are close to limits, based on manual assumptions, or missing manufacturer data.
Confirm the result against the project specification before procurement, permitting, or installation.

Verify whether conductor upsizing, parallel raceways, flexible connections, separately derived systems, or special equipment rules require a different grounding or bonding conductor.

Ungrounded conductors may have been upsized. Verify whether proportional EGC upsizing is required.

Parallel raceway or cable installations may require equipment grounding conductors in each raceway or cable assembly. Verify the installation requirements before use.

Flexible raceways and flexible equipment connections may require separate bonding or grounding review.

Separately derived systems may require additional grounding and bonding review. This calculator does not size grounding electrode conductors, system bonding jumpers, or supply-side bonding jumpers.

This calculator sizes a wire-type equipment grounding conductor. If relying on a metal raceway or enclosure as the equipment grounding path, verify continuity, fittings, bonding, corrosion, flexibility, and project/AHJ requirements.

Special equipment or manufacturer grounding requirements may require a different grounding or bonding approach.

Save and Export

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Calculation Breakdown

Input Summary

Calculation type: Equipment Grounding Conductor
Mode: Find minimum EGC size
Entered OCPD rating / setting: 100 A
EGC material: Copper
EGC code-basis review: 2023 NEC

Table Selection

Applicable table row: 100 A
Minimum wire-type EGC size: 8 AWG Cu

Installation Review

Upsized ungrounded conductors: Unknown
Parallel raceways or cable assemblies: Unknown
Flexible connection: Unknown
Separately derived system: Unknown
Metal raceway grounding path: Unknown
Special equipment requirement: Unknown

Result

Preliminary EGC size: 8 AWG Cu
Status: Preliminary Size - Verify

Code and Design References

NEC Table 250.122

Minimum wire-type equipment grounding conductor size is selected from the rating or setting of the upstream overcurrent device.

Verify the adopted code edition, conductor upsizing, parallel raceways, flexible connections, separately derived systems, bonding, metal raceway continuity, local amendments, and special equipment requirements.

Scope of this calculator

This calculator sizes a preliminary wire-type equipment grounding conductor only. It does not size grounding electrode conductors, bonding jumpers, or separately derived system grounding and bonding conductors.

Use the Grounding & Bonding Workflow for broader grounding and bonding package review.