I just read through volume 1 DC "Shock Current Path" and I think it's pretty good in overall, however, I noticed two little mistakes. Figures 4 and 6 and their respective descriptions are not completely correct. The reason is the following:
If you have a voltage source and the voltage source is NOT grounded and a person would stand on ground and touch the positive pole (for DC, or the phase for AC) of the voltage source, then it depends on the potential that the ground is at whether the person would get shocked or not, since it is the potential difference between two points that drives the current. If say the voltage source is +230V and the ground is at +20V (in the real world the ground would probably be more close to 0V) the person will still feel a current that depends on the person's resistance and the remaining potential difference of +210V!
If you have a voltage source and the voltage source is NOT grounded and a person would stand on ground and touch the positive pole (for DC, or the phase for AC) of the voltage source, then it depends on the potential that the ground is at whether the person would get shocked or not, since it is the potential difference between two points that drives the current. If say the voltage source is +230V and the ground is at +20V (in the real world the ground would probably be more close to 0V) the person will still feel a current that depends on the person's resistance and the remaining potential difference of +210V!