That is only for steady state. When a switch first opens or closes there
is a short time before the current reaches that point depending on how much
inductance or capacitance is in the circuit. As the electricity will travel
around the earth about 7 times in one second there is a small but usually
too small of a time for most simple circuits to mater.
I doubt that any GFCI or arc sense type of breaker would be designed fast
enough to detect that.
On Monday, February 1, 2016 at 12:38:19 PM UTC-5, Ralph Mowery wrote:
Another way of looking at this would be if there would be a problem with
a race between two switches opening near simultaneously, one on the hot,
one on the neutral, then why isn't there a problem right now, where you
have only one switch opening, with no switch at all on the neutral? There
are also 240V GFCI where circuits can have a switch on each wire and
they don't trip. Like you say, the electrodynamics of any of those
effects are way below what a GFCI is looking at.
Table lamps. My grandmother used to paint porcelain, and teach others.
Many of these were older people with cataracts in their eyes. That
requires a lot of lamps to see the fine detail.
BTW, she used an old porch that had been enclosed. There were no 120V
receptacles there except the one by the kiln. So, there were a lot of
(18 gauge) extension cords too.
* the hot wire goes to the smaller slot in the
socket. Less likely to have foreign objects
stuck in the smaller slot. (Think kids with
* With polarized plugs, the hot goes up to
the switch. So when the device is turned off,
the wires in the device are not powered.
Safety reasons, for sure.
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