ISO 13849: Frequency and/or exposure to hazard - how to decide F1/F2?
In ISO 13849-1, you need to choose F2 - frequent exposure if:
- A person is exposed to the hazard more frequently than once every 15 minutes and/or
- The total exposure time exceeds 1/20 of the machine’s operating time (equal to 24 minutes per 8-hour shift).
This is listed as an example in ISO TR 14121-2:2012.
Otherwise, choose F1 - infrequent exposure.
Source: Pilz Machinery Safety Academy, ISO 14121-2:2012
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