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Hubbell arresters use a standard #4 lead wire as the connection from the arrester to the ground. The diameter of the lead connected to the arrester has insignificant effect on the protection offered by the arrester. The lead diameter does not affect the total discharge voltage or arrester clamping ability. IEC standard design testing is completed with lead wires of 5 mm in diameter, which is slightly smaller than a #4 lead wire.
