On 10/1/13 at 12:29 AM, di...@webweaving.org (Dirk-Willem van
Gulik) wrote:
While in a lot of other fields - it is very common for 'run of
the mill' constructions; such as when calculating a floor,
wooden support beam, a joist, to take the various standards and
liberally apply safety factors. A factor 10 or 20x too strong
is quite common *especially* in 'consumer' constructions.
In cave rescue the National Cave Rescue Commission (a training
organization) uses a 7:1 system safety ratio in its trainings.
This is for building systems where people could be seriously
hurt or killed if the system fails.
Cheers - Bill, NCRC instructor
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