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

[Bill Brooks]

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Mark,

>From my OSHA safety training, AC has a few major problems:

1.)at about 20 mAmps your lungs can paralyze causing suffocation (the most
common cause of death with electricity).

2.)at about 70-80 mAmps through your heart, your heart will go into
fibrillation and  you are dead in a few minutes without a defibrillator.

3.)at higher currents, nerves are permanently damaged and muscle tissue
begins to cook causing death if it happens in the right places.

Of the thee listed above, the first two are related to frequency of ac. The
third is common to both dc and ac because the current is doing the damage
not the frequency. AC can cause your muscles to constrict, as pointed out,
making it difficult to let go, causing longer exposure to the current, and
therefore more damage because of the ac current.

DC is safer than ac from a shock and electrocution point of view (Edison
made this case passionately), but dc is definitely a greater fire hazard
since an arc has a constant voltage applied to it, rather than with ac where
the voltage collapses 120 a second on an arc.

Look in OSHA safety manuals for electric shock hazards.

Bill.



-----Original Message-----
From: Mark Robinson [mailto:Mark at TheEnergyGrid.com]
Sent: Wednesday, July 21, 2004 8:16 AM
To: RE-wrenches at topica.com
Subject: AC or DC Shock: Which is worse? OUCH! [RE-wrenches]

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