Given:

Pole Strength Factor (PSF) = 0.375

Maximum Capacity Utilization % (MCU%) = 71.7

Maximum Pole Moment (Load) = 27,288 ft-lb

*NOTE* Maximum pole moment occurs at the groundline

Goundline Allowable Moment (GAM) = 38,456 ft-lbs

Groundline Fiber Stress (GFS) = 7600 psi

Groundline Circumference (GC) = 37.5 in

Formulas:

Required Factor of Safety (RFOS) = 1/PSF

Pole Strength Calc (PSC) = 0.000264*GFS*GC^3

Groundline Allowable Calc (GAC) = PSC*PSF

*Maximum % Utilization (M%U) = MCU% / GAC *100

Pole Factor of Safety = RFOS/M%U *100

Calculations:

Required Factor of Safety (RFOS) = 1/PSF = 1/0.375 = 2.67

Pole Strength Calc (PSC) = 0.000264*GFS*GC^3 = 0.000264*7600*37.5^3 = 105,806.25

Groundline Allowable Calc (GAC) = PSC*PSF = 105,806.25*0.375 = 39,677.34375

*Maximum % Utilization (M%U) = MCU% / GAC *100 = 71.7 / 39,677.34375 *100 = 0.18071

Pole Factor of Safety = RFOS/M%U *100 = 2.67/0.18071 * 100 = 1477.52

With Corrected Formula:

*Maximum % Utilization (M%U) = Load / GAC *100 = 27,288 / 39,677.34375 *100 = 68.77477

Pole Factor of Safety = RFOS/M%U *100 = 2.67/68.77477 * 100 = 3.88

With GAM Value + Corrected Formula:

*Maximum % Utilization (M%U) = Load / GAM *100 = 27,288 / 38,456 *100 = 70.95902

Pole Factor of Safety = RFOS/M%U *100 = 2.67/70.95902 * 100 = 3.76

Reported Pole Factor of Safety Value = 3.72