General Order 95
Section IV
Strength Requirements for All Classes of Lines
43.1 Heavy Loading
Heavy loading shall apply in all parts of the State of California
where the elevation exceeds 3000 feet above sea level (see Appendix A for
map indicating the approximate location of the heavy loading district). This
loading shall be taken as the resultant stress due to wind, ice and dead
weight under the following conditions:
A.
Wind
A horizontal wind pressure of 6 pounds per square foot
of projected area on cylindrical surfaces, and 10 pounds per square foot
on flat surfaces shall be assumed. Where latticed structures are used, the
actual exposed area of one lateral face shall be increased by 50% to allow
for pressure on the opposite face, provided this computation does not indicate
a greater pressure than would occur on a solid structure of the same outside
dimensions, under which conditions the latter shall be taken.
B. Ice
A radial thickness of one–half inches of ice, weighing
57 pounds per cubic foot, on all conductors shall be assumed in computing
vertical and wind loadings.
C. Temperature
Temperature shall be considered to be 0°
F at the time of maximum loading. The normal temperature for computing erection
conditions is 60° F. Maximum temperature shall be assumed as 130°F
in computing sag under this condition.