Hello pstc-ers,
The Safety Link (http://www.safetylink.com) noted the entry of its
50,000th visitor today, 2 September 1997. Our counter was started in
December of 1995 and the website has been active since the Summer of that
year.
We would like to thank all of our visitors as well as our
In all of the discussions of hair-dryer in a tub scenario, no one has discussed
the GFI and how it works. It senses the current in both power leads, and if
they are not equal, it trips OFF. Thus it assumes that any current flowing
between phase/neutral is good, any current in the phase lead not
You forgot two major assumptions:
1) The impedance of the water and
2)the impedance of the human in water.
In water, the human has orders of magnitude of lower impedance, and therefore,
the majority of the current will flow through the human assuming there is a path
to ground. It is
Don't forget, the low impedance path from the black (high side of
switch) to water to human to water to neutral (white wire.) It doesn't go
to ground and may not even trip the GFI!
hans_mellb...@non-hp-cupertino-om5.om.hp.com 09/02/97
06:33pm
You forgot two major assumptions:
1) The
I have been reading some of the responses to this note. It appears many of
us product safety professionals are missing some key points. I would like
to
thank the author for bringing this up for discussion. This is what makes
the
bulletin board so valuable.
A GFI is a
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