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Wood Poles by Class

Class Circumference at Top Circumference at 6 Feet from Butt Strength Common Uses Typical Length
Class 1 42 inches 27.5 inches Highest load-bearing capacity High-voltage power lines, critical infrastructure 40 to 90 feet
Class 2 37.5 inches 25.5 inches Very high load-bearing capacity Major distribution lines, street lighting 35 to 90 feet
Class 3 33 inches 23.5 inches High load-bearing capacity General distribution lines, medium-duty applications 30 to 80 feet
Class 4 28.5 inches 21.5 inches Good load-bearing capacity Standard utility poles, telecommunications 25 to 75 feet
Class 5 24 inches 19.5 inches Moderate load-bearing capacity Light-duty distribution lines, secondary power lines 25 to 65 feet
Class 6 19.5 inches 17.5 inches Lower load-bearing capacity Service poles, light-duty applications 20 to 60 feet
Class 7 15 inches 15.5 inches Lowest load-bearing capacity Minimal structural requirements, temporary structures 20 to 55 feet