Grounding Electrode Calculator

Grounding Electrode

Calculate grounding electrode requirements including conductor size, ground rod specifications, and soil resistivity considerations for electrical system grounding per NEC.

Service Size (Amps)

Soil Type

Ground Rod Material

Number of Ground Rods

Formula

GEC Size = Per NEC Table 250.66 based on service size; Single Rod Resistance = (Soil Resistivity x 0.8) / Rod Length; Total Resistance = Single Rod R / Number of Rods; Minimum Rod Spacing = 2 x Rod Length

Frequently Asked Questions

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