[GreenKeys] Switch polarity

[drlegendre .]

Pretty sure that "up for off" convention is a result of the Commonwealth..
IIRC, many of the 3-pin Euro mains plugs expect the 3rd terminal to be up
vs. down as in American systems.

The one that always gets me, is the reverse standard for valving on
locomotives. In most any case, a ball valve is open when the lever is
parallel to the line (makes sense). But I was told this is the direct
opposite of the railways, where the valve is open when the lever is
perpendicular to the line.

Confirm, deny, excoriate?

On Sat, May 27, 2017 at 10:08 PM, WA5CAB--- via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Because they are in the northern hemisphere?  :-)
>
> In a message dated 05/27/2017 21:30:46 PM Central Daylight Time,
> dave at horsfall.org writes:
>
> One thing that's been bothering me when watching old American films; why
> are their switches always upside-down i.e. flip it up for "on"?
>
> --
> Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will
> suffer."
>
>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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