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Original Version
Rule 49.1-B

49.1-B Dimensions
The minimum top circumference of wood poles shall be not less than the following:
Inches
Grade “A” Heavy loading district 22
Grade “A” Light loading district 19
Grade “B” * Heavy and light loading districts 19
Grade “C” Heavy and light loading, urban districts 19
Grade “C” Circuits of 750-7,500 Volts, heavy loading, rural districts 19
Grade “C” Supply circuits of 0-750 Volts and communication circuits, heavy loading rural districts 16
Grade “C” Light loading, rural districts 16
Grade “F” Cable or more than 4 single wires or 8 conductors duplexed or paired, heavy loading districts 15
Grade “F” Cable or more than 6 single wires or 12 conductors duplexed or paired, light loading districts 15
Grade “F” Not more than 4 single wires or 8 conductors duplexed or paired, heavy loading districts 12
Grade “F” Not more than 6 single wires or 12 conductors duplexed or paired, light loading districts 12
Note: Poles having a ground line circumference of less than 12 inches are not safe to climb unless supported by guys, pike poles, etc.
* Supply Poles in Grade “B” construction in rural, light loading districts may have a top circumference less than 19 inches but not less than 16 inches.
* Communication Poles in Grade “B” construction at crossings over major railroads may have top circumferences less than 19 inches but not less than the following, provided such poles meet the specifications of the American Standards Association, 05.2–1941, 05.4–1941 or 05.6–1941, and are butt treated if of western red cedar or are full–length pressure treated if of Douglas fir or Southern Yellow pine:
Number of Conductors Supported Minimum Pole Top Circumference (inches)
Heavy Loading Light Loading
10 or less1515
11-201717
21-401917
More than 401919

Strikeout and Underline Version
Rule 49.1-B

49.1-B Dimensions
The minimum top circumference of wood poles shall be not be less thanthat the following:
Inches
Grade “A” Heavy loading district 22
Grade “A” Light loading district 19
Grade “B” * Heavy and light loading districts 19
Grade “C” Heavy and light loading, urban districts 19
Grade “C” Circuits of 750-7,500 Volts, heavy loading, rural districts 19
Grade “C” Supply circuits of 0-750 Volts and communication circuits, heavy loading rural districts 16
Grade “C” Light loading, rural districts 16
Grade “F” Cable or more than 4 single wires or 8 conductors duplexed or paired, heavy loading districts 15
Grade “F” Cable or more than 6 single wires or 12 conductors duplexed or paired, light loading districts 15
Grade “F” Not more than 4 single wires or 8 conductors duplexed or paired, heavy loading districts 12
Grade “F” Not more than 6 single wires or 12 conductors duplexed or paired, light loading districts 12
Note: Poles having a ground line circumference of less than 12 inches are not safe to climb unless supported by guys, pike poles, etc.
* Supply Poles in Grade “B” construction in rural, light loading districts may have a top circumference less than 19 inches but not less than 16 inches.
* Communication Poles in Grade “B” construction at crossings over major railroads may have a top circumferences less than 19 inches but not less than the following, 16 inches provided such poles meet the specifications of ANSI O5.1-2008. the American Standards Association, 05.2–1941, 05.4–1941 or 05.6–1941, and are butt treated if of western red cedar or are full–length pressure treated if of Douglas fir or Southern Yellow pine:
Number of Conductors Supported Minimum Pole Top Circumference (inches)
Heavy Loading Light Loading
10 or less1515
11-201717
21-401917
More than 401919

Final Version
Rule 49.1-B

49.1-B Dimensions
The minimum top circumference of wood poles shall not be less that the following:
Inches
Grade “A” Heavy loading district 22
Grade “A” Light loading district 19
Grade “B” * Heavy and light loading districts 19
Grade “C” Heavy and light loading, urban districts 19
Grade “C” Circuits of 750-7,500 Volts, heavy loading, rural districts 19
Grade “C” Supply circuits of 0-750 Volts and communication circuits, heavy loading rural districts 16
Grade “C” Light loading, rural districts 16
* Supply Poles in Grade “B” construction in rural, light loading districts may have a top circumference not less than 16 inches.
* Communication Poles in Grade “B” construction at crossings over major railroads may have a top circumferences not less than 16 inches provided such poles meet the specifications of ANSI O5.1-2008.