General Order 95
Section IV
Strength Requirements for All Classes of Lines
49.1 Poles, Towers and Other Structures
A. Strength (See Rule 48)
(1) Wood poles shall be of sound timber.
(2) In cases where lateral loads on a pole or structure require the use of a guy(s), the pole or structure below the point of the guy attachment shall be considered merely a strut, the guy(s) taking all lateral loads. In such cases, the pole strength requirement shall apply at the point of guy attachment rather than at the ground line.
Note: Revised July 26, 1966 by Decision No. 71009 March 30, 1968 by Decision No. 73813 February 13, 1974 by Decision No. 82466 January 21, 1992 by Resolution SU–10, January 13, 2006 by Decision No. 05-01-030 and February 5, 2014 by Decision No. 14-02-015.
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 |
|
* |
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. |
Note: Revised February 5, 2014 by Decision No. 14-02-015.
C.
Setting of Poles
The depths of pole setting given in Table
6 are applicable to
poles set in firm soil or in solid rock.
Where the resultant bearing surface is not sufficient to prevent overturning or
excessive movement of the pole at the ground line, and/or the soil is not firm,
deeper settings or other special methods shall be used.
Where poles were set in firm soil, but the soil has since been excavated or
subjected to erosion, the minimum embedment shall be no less than 90% of the
values specified in Table 6.
Note: Revised July 26, 1966 by Decision No. 71009, February 13, 1974 by Decision No. 82466, January 19, 1994 by Resolution SU–25, October 9, 1996 by Resolution SU–40, January 13, 2006 by Decision No. 05-01-030 and February 5, 2014 by Decision No. 14-02-015.
|
Table
6 |
||
|
Total
length of pole |
Depth
in soil |
Depth
in Rock |
|
20 |
4 |
3 |
|
25 |
4½ |
3 |
|
30 |
5 |
3 |
|
35 |
5 |
3½ |
|
40 |
5½ |
3½ |
|
45 |
6 |
4 |
|
50 |
6½ |
4 |
|
55 |
7 |
4½ |
|
60 |
7 |
4½ |
|
65 |
7½ |
5 |
|
70 |
7½ |
5 |
|
75 |
8 |
5½ |
|
80 |
8 |
6 |
Note: Revised March 9, 1988 by Resolution E–3076
D.
Gains
Gains or equivalent means shall be provided for
increasing surface contact of crossarms with round
wood poles. Where gains are cut, the depth shall be not less than one–half inch or more than one inch. “Slab”
gains, metal gains, pole bands, or assemblies of wood or metal supports that
provide suitable surface contact and adequate strength are permitted.
E. Replacements (See Rule 44.3 )