General Order 95
Section IV
Strength Requirements for All Classes of Lines
| Line Element | Grades of Construction | ||
| Grade "A" | Grade "B" | Grade "C" | |
| Conductors, splices and conductor fastenings (other than tie wires) |
2
|
2
|
2
|
| Pins |
2
|
2
|
2
|
| Pole line hardware |
2
|
2
|
2
|
| Line Insulators (mechanical) |
3
|
2
|
2
|
| Guy insulators (mechanical) | |||
|
Interlocking |
2
|
2
|
2
|
|
Noninterlocking glass fiber |
3
|
2(a)
|
2(b)
|
| Guys |
2
|
2
|
2
|
| Messengers and span wires |
2
|
2
|
2
|
| Foundations against uplift |
1.5
|
1.5
|
1.5
|
| Foundations against depression |
3
|
2
|
2
|
| Poles Towers and Structures | |||
|
Wood
|
4
|
3
|
2
|
|
Metal (including elements of foundations)
|
1.5(c)
|
1.25(c)
|
1.25(c)
|
|
Reinforced concrete
|
4
|
3
|
3
|
|
Prestressed or post-tensioned concrete
|
1.8
|
1.5
|
1.5
|
|
Other engineered materials
|
1.8
|
1.25
|
1.25
|
| Crossarms | |||
|
Wood
|
2
|
2
|
2
|
|
Metal
|
1.5 (c)
|
1.25 (c)
|
1.25 (c)
|
|
Prestressed Concrete
|
1.8
|
1.5
|
1.5
|
|
Other engineered materials
|
1.5
|
1.25
|
1.25
|
| (a) | Insulators are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement, or other conditions subsequent to installation) to less than 95 percent of the safety factor specified in Rule 44.1 |
| (b) | Insulators are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement, or other conditions subsequent to installation) to less than 75 percent of the safety factor specified in Rule 44.1. |
| (c) | For aluminum members subject to tension caused by one or more estimated loads and where the critical load combination for the tension member would not endanger adjacent compression members, the factor of safety on ultimate tension shall be 2 for Grade “A” construction and 1.67 for Grades “B” and “C” construction. |
Note: Revised July 26, 1966 by Decision No. 71009 January 6, 1968 by Decision No. 73455 March 30, 1968 by Decision No. 73813 February 13, 1974 by Decision No. 82466, January 21, 1992 by Resolution SU–10 and February 5, 2014 by Decision No. 14-02-015.