AC or DC Shock: Which is worse? OUCH! [RE-wrenches]

[Mark Robinson]

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	I've been doing some Nextek-related research. Several people have
resisted the idea of running DC power lines through offices because of the
increased hazard of DC shock. I've been finding all kinds of information
about whether an AC shock is worse than a DC shock. Unfortunately, it's
heavily contradictory. There hasn't been a lot of testing done. Subjects are
hard to find. (Any Volunteers?)

	As an electrician, I was always under the assumption that you 'can't
let go' of DC. This is challenged in several studies, one claiming:

...AC is said to be four to five times more dangerous than DC. For one
thing, AC causes more severe muscular contractions(
http://pchem.scs.uiuc.edu/pchemlab/electric.htm). Reportedly it's the
frequency that causes contractions.... And 60 Hz is the worst. 

Personally, I've been knocked off a ladder by both!

http://www.fishock.com/service/shock_new.html claims that the AC/DC
component is not significant.

A Comparison chart at http://www.allaboutcircuits.com/vol_1/chpt_3/4.html
shows that DC is safer than 60Hz, and 10Hz is even better.

Another site (http://www.codecheck.com/ecution.htm) claims that there are
more horror stories about DC shock because more victims have lived to tell
them.

If anyone has any references or thoughts to add... I'd appreciate it.

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