big_pond -

Indeed it is the current that kills you and truly in terms of water contact 220 passing more current is more dangerous. Outside of the involvement of water if your contact time with 220 is equal to that of 110v, 220 is again more dangerous due to the current issue. However human muscle reaction to 110v current is one of contraction where as 220v is muscle spasm. Therefore you are more likely to be in forced contact with 110v electricity to the point of it being lethal then you are to 220v. (110v you may not be able to let go of, 220v is much more likely to force you to let go of it) Again this is not in relation to contact with water or other source of uncontrolled contact.

Now if you can invert to DC then all the better, it may give you a shock but not the nature that tends to stop your heart as does AC.

James - On a specific note to your situation... I agree with Tuzz... go with aeration and run the majoprity of the distance with airline as opposed to powerline. Much less loss.

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