Brian, I actually went through the steps of estimating contact area of a finger and an object. For surface areas near the size of a finger (my own), the math seems to make sense. I then took the same method put it in a spreadsheet and applied it to the leading edge of a rotating fan. My goal was to show that a particularly low powered fan was not a hazard. âEstimating again the actual contact area of the fan blade against a finger and rotational force, the math was able to tell me if I had exceeded or not exceeded a limit. In that test I also used myself as a guinea pig and actually stuck my own finger onto the fan. I was no worse for the wear. I am not aware of any IEC based standards for body parts other than the normal accessibility tests and ergonomics. Nor do I know of any information on skin sensitivity as you might find for children vs adult. I believe in the past SEMI or SEMATCH guidelines have addressed certain cases such as the small size 20% âof Asian females and the large size of the 80% European male. If can show a good and justifiable rationale, you should be able to make a good case with any third party reviewer. Thanks, - doug Douglas Powell http://www.linkedin.com/in/dougp01
Iâm trying to determine if a moving part is hazardous or not. According to IEC/EN 61010-1 section 7.3.4,
Forces less than those listed below are considered Non-Hazardous:
⢠Contact pressure of 50 N/cm² with a maximum force of 150 N. ⢠For body contact areas greater than 3 cm² a temporary force of 250 N is allowed for no more than 0.75 seconds.
To determine âContact pressureâ I must take the Max Force (which I can measure) and divide it by the âBody Contact Areaâ in cm².
But how do I know what my body contact area is for a finger tip, entire finger, or a hand? Are there standard values that are used in industry for these calculations? Are there values used for arm, head, foot, etc.?
How about if the moving part creates a Sheer hazard? How is the Body Contact Area determined in this case?
Thanks for any advice on this topic.
The Other Brian LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you.----------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ For help, send mail to the list administrators: For policy questions, send mail to: ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ For help, send mail to the list administrators: For policy questions, send mail to: | ||
- [PSES] Australian plugs and sockets Nick Williams
- [PSES] Fwd: Australian plugs and sockets Nick Williams
- Re: [PSES] Australian plugs and sockets [email protected]
- [PSES] Body Contact Areas Kunde, Brian
- Re: [PSES] Body Contact Areas Paul Milton
- Re: [PSES] Body Contact Areas Doug Powell
