Safety Standard IEC xx479-1

The point of this posting is just to get familiar with the way these safety standards are presented.Here is a copy of 'Figure 1' from a paper that references IEC 60479-1.

As fas as I can see, this is an older version of IEC 479-1. I note that this one sets C1 at 40mA instead of 30mA.

I've added the Normal Distribution Bell Curve to try to explain the three lines: c1 at 5%, c2 at 50%, and c3 at 95%.

For a 5-second duration shock hazard, the c1 limit is 40mA. Even at 40mA, 5% of those exposed would experience ventricular fibrillation. That's an important issue because even 5% would be significant. For this sort of application, personally I don't think that 5% can be considered to be close enough to zero (0.1% might be arguably reasonable).

Click image for larger version.