Tri-County Electric Cooperative's (TEC, Rushford, Minnesota, U.S.) installed 58 technologically advanced wood poles in a demonstration line in South Carolina.

The poles feature a preservative treatment, uncommon crossarms and an innovative bracearm fitting. All of the crossarms are Southern pine, manufactured by Cox Industries (Orangeburg, South Carolina, U.S.).

A recent study found that Southern pine crossarms have physical properties comparable to the more common Douglas fir crossarm and are frequently less expensive.

Cox Industries pressure-treated TEC's crossarms and poles with copper azole (one of the “new-generation” preservatives consisting of copper and an organic fungicide).

Though not expected to replace chromated copper arsenate (CCA) or pentachlorophenol (penta) preservatives anytime soon, utilities could install copper azole poles in settings such as schoolyards if parents voice concerns about traditional treatments.

The line's Southern pine bracearms are secured to crossarms and poles with injection-molded composite end fittings. The lightweight high-density plastic fittings, produced by Whitman Mold Co. (Orangeburg), are believed to be the first of their kind in the world. Their insulation value and resiliency yield safety and aesthetic benefits.
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