[GreenKeys] Switch Polarity

[drlegendre .]

"Or in other words, "off" must
be down, to reduce the likelihood of the circuit being energized
accidentally."

No real idea if it's actually correct, but this is the simplest and most
functional explanation I've ever heard. Makes perfect sense.

Knife switches are cool.

On Sat, May 27, 2017 at 11:24 PM, Robert Goff <robert.h.goff at gmail.com>
wrote:

>  A bit off topic already, but . . .
>
> I believe the "up for on" switch orientation is a carry-over from the
> days of open knife switches.  It may even still be an NEC rule that
> for safety reasons a knife switch must be mounted such that the pull
> of gravity causes the switch to open.  Or in other words, "off" must
> be down, to reduce the likelihood of the circuit being energized
> accidentally.
>
> 73,
> de Robert W7MKA
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