⭕ NFPA 780 Counterpoise (Bare 2/0 AWG Tinned Copper Ring Buried 30", R <10Ω)

Counterpoise Ground Ring Resistance Calculator

Size buried counterpoise perimeter ground ring loops encircling commercial buildings under NFPA 780 & IEEE 80: calculate low-frequency ground resistance (ensuring total system ground resistance remains strictly <10 ohms [or <5 ohms for sensitive communications] using bare 2/0 AWG tinned copper wire buried 30" below grade connected to 10-ft ground rods), and earth grounding profits.

1. Project & Operating Inputs

Building Perimeter Loop Length (Linear Feet e.g. 1,400 Linear Feet)

Soil Resistivity (Ohm-Meters e.g. 120 Ω-m Loam / Clay Soil)

Customer Bid Price for Trenched, Dropped & Exothermic Bonded Ring ($)

2/0 Tinned Solid Copper, 5/8"x10' Copper Clad Rods, Trencher & Crew ($)

2. Financial Breakdown & Yield

PERIMETER COUNTERPOISE RINGS

Turnkey Ground Ring Loop Profit

Earth Grounding Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost