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A normal dry body's resistance from thumb to thumb is about 2.6 meg ohms.

This is the body's outside resistance from point to point and not the body's internal resistance. One the shock has started the skin becomes burned and this starts to lower the outside body resistance to a lower value. The longer the burning continues the lower the outside resistance becomes until it reaches an inside body resistance.

The body's internal resistance is in the neighbourhood of 1000 ohms.

Using the same formula with the internal resistance and see the drastic current increase that will kill you.

The formula for amperage is Amps = Voltage / Resistance.

Using a secondary voltage of 220 the formula is, Amps = 220/2600000 = .0000846 amps or .0846 milliamps.
Using a secondary voltage of 220, the formula is , Amps = 220/1000 = .22 amps or 220 milliamps
Using a secondary voltage of 480 the formula is, Amps = 480/2600000 = .0001846 amps or .1846 milliamps.
Using a secondary voltage of 480, the formula is , Amps = 480/1000 = .48 amps or 480 milliamps

As you can see, as the voltage become higher so does the current that can flow through your body if you short across an electric potential.

The following list is the tolerances that the body can stand.

Less than 1/2 milliamp no sensation
1/2 to 2 milliamps Threshold of perception
2 to 10 milliamps muscular contraction
5 to 25 milliamps painful shock (may not be able to let go)
Over 25 milliamps Could be violent muscular contraction
50 to 100 milliamps Ventricular fibrillation
over 100 paralysis of breathing.

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