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Original General Order 95


Section IV


Strength Requirements for All Classes of Lines


48.5      Tower or Pole Foundations and Footings


In calculating the resistance of foundations or footings of towers, poles and pole line structures to uplifts, the weight of concrete shall be taken as not more than 145 pounds per cubic foot and the weight of earth (calculated 30 degrees from the vertical) shall be taken as not more than 90 pounds per cubic foot.  The resistance of soil to the depression of foundations or footings shall be calculated from the best available data on the soil in question.  In lieu of calculation, the strength of foundations or footings against uplift or depression may be determined by tests under the soil conditions obtaining.