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It's the watts that kill you.
Some people say "It is not the Volts that kill you it is the amps"
Do you think maybe it would be smarter to say the WATTS (of energy) is what can kill you? Of course to force enough watts through a body you have to have either lots of volts to over come the body's natural resistance or a very good connection or a persistent connection. 120 Volts is not "lots of voltage" so we need a good low resistance connection and\or the inability to escape the connection.
One in-escapable connection (besides being in a bath tub) is crawling in a confined space and contacting a large surface of a well grounded piece surface or a good size piece of metal.
Example I The electrician was in an attic. He had to lay on top of a run of conduit to work on a junction box. When he got shocked, some how he could not get away from the source of power and he could not get off of the grounded pipe. He died.
Example II The HVAC guy was in the basement, sitting down and leaning against the sheet metal cold air return when his partner hooked up temporary power to the house that was under construction. I don't know what he was working on but the large area of sheet metal gave a low resistance connection. He died.
To many watts In both cases the fact that the shock lasted a long time resulted in too many watts being transmitted through the persons body.
A GFI will shock you. A GFI does not prevent a shock, it just limits both the duration of the shock and the time the current flows
6 Watts is ok - A GFI is programmed to let no more than 5-8 mil-amps escape (usually to ground) before it shuts off. If I am correct with my math 6 mA at 120 Volts is 6 (six) watts and this is not enough to cause a problem in a normal person.
15A t 120V is not ok. That would be 1,800 watts. This is about the same as a space heater on the high setting.
.5A at 1,200V is 600 Watts. Not good for very long.
The Danger is too many watts for too long. 8 ma for a mil second or something is ok.
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