The static system safety factor must be greater than ___ to ___.

• A. 2:1
• B. 5:1
• C. 15:1
• D. 10:1

Answer: (D)

For static loads, the safety factor is a ratio of how strong a system is to the maximum load it must reliably carry. It represents the margin built into the design to cover uncertainties like material flaws, manufacturing tolerances, and variations in the actual load.

A static safety factor of ten-to-one means the structure or component is designed to withstand ten times the maximum expected static load. This level of margin is a common minimum in many safety-focused designs, providing enough buffer to keep failures unlikely even when some assumptions are off or conditions aren’t perfectly estimated.

Lower factors, such as two-to-one or five-to-one, don’t leave enough room for those uncertainties and potential errors, making failures more plausible under real-world conditions. A fifteen-to-one factor is more conservative than required in many contexts, but the standard minimum in this case is ten-to-one.