2022 BURNDY Master Catalog

Exothermic Grounding

thermOweld ® Contact - GF Application Information for Vertical, Horizontal or Grid Construction thermOweld ® Contact - GF Application Information Vertical Installation Drill or bore a hole the desired diameter and depth. Suspend ground electrode in center of hole to be filled. Pour Contact - GF until desired level is obtained. No tamping is required. Horizontal or Grid Construction 1 Pour into horizontal trench until level of ground wire is reached. Place ground wire. Pour additional Contact - GF until wire is covered to desired height. Cover with fill. No tamping required. For grid construction, pour thermOweld ® Contact - GF and spread over ground grid until desired thickness is achieved. Cover with fill. 1 Entire grounding system should be surrounded by thermOweld ® Contact - GF. Conductors should be insulated as they exit Contact - GF column.

Dry Volume of thermOweld ® Contact - GF vs. Hole Size

Ground Resistance Comparison of Bare Rod vs.

Hole Size with 5/8" x 10' Rod in Center of 15' Hole

Percent Resistance Compared to Rod Only (100%)

Lbs. of Contact - GF Per Ft.

Hole Size

4" 6" 8"

6.5 14.5 25.8 40.4 58.1

4" 6" 8"

52% 47% 44% 42% 40%

10" 12"

10" 12"

Steady State Leakage Resistance 2 Using 4/0 Copper Wire vs. thermOweld ® Contact - GF

Percentage of Resistance with 0.457" Wire Plus Contact - GF in Various Diameters Compared to Wire Only (100%) 2" 3" 4" 6"

0.457" Diameter Wire Only

Length

25' 50' 75' 69% 73% 75% 77% 78% 79% 80% 80% The use of Contact - GF around the grounding system will also reduce surge impedance by increasing the effective contact area of the electrode to soil. 2 100' 150' 200' 250' 300' 100% 100% 100% 100% 100% 100% 100% 100% 83% 85% 86% 87% 88% 88% 89% 89% 78% 81% 82% 83% 84% 85% 85% 86% 74% 77% 79% 80% 82% 83% 83% 84%

Horizontal Construction

thermOweld ® Contact - GF

Copper Wire

Earth or Fill

Grid Construction

thermOweld ® Contact - GF

Earth or Fill

Copper Wire

1-800-465-7051 (Canada) 1-603-647-5299 (International)

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