facteur de sécurité

listen to the pronunciation of facteur de sécurité
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{n} safety factor
The ratio of the maximum stress or load which something can withstand to the stress or load which it was designed to withstand under normal operation

The common safety factor used for elevator support cables is 11.

considering several different elements in a calculation to be sure of making the proper decision
the ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use