What's the point below which electrical current is generally considered safe for "casual" human contact?
Is either voltage or amperage more "dangerous" (e.g. high voltage / low amperage vs. low voltage / high amperage), or is the only consideration the total current?
Answer
As rules of thumb, I've generally thought of myself as a 70 kΩ resistor to ground that feels pain at around 1 mA, which can be driven by 70 V or so. In my experience, the pain threshold is slightly above 48 V.
I can't say that I have any good medical science to back this up, but there are a few empirically obtained data points in that I'm not dead yet.
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