At 12:34 PM 11/2/02 +1100, Sean Alcorn - Avion Sydney wrote: >>I believe GFIs in the US are supposed to trip at 7 or more ma. > >I have often wondered about this. I have done some paramedics training, >and from memory - doesn't the heart start to fibrillate at about 25mA. >I've often thought it cruel that - if my memory is correct and it is >indeed 25mA - our RCCBs are set at 30mA :-) Articles that I have read in the distant past suggested that 50 Hz is MUCH less likely to induce ventricular fibrillation than 60 Hz - IIRC, the most susceptible frequency is somewhat above 60 Hz. I don't recall the specific details but I'll try to look it up later this weekend. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 18 years of Engineering Innovation (1984 - 2002) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu