[GreenKeys] Switch polarity

[WA5CAB at cs.com]

Ground pin up also has the advantage that weight of the cord pulling down 
on the plug is less likely to expose the hot blade to a falling bucket of 
nails that someone carelessly spilled down the wall.  

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 05/29/2017 12:21:37 PM Central Daylight Time, 
scottjohnson1 at cox.net writes: 
> Convention in the commonwealth seems to be up for off, everywhere else 
> seems to be opposite.  In aerospace, up is on, for a vertical panel, forward 
> is on, for an overhead panel, and outward is “on” for a side panel.  BTW, 
> in north America, the grounding terminal on a NEMA 15  is SUPPOSED to be 
> up, even the writing on the outlet bears this out, but I think design folks 
> liked the “face” look, so down is common.  In some locales, and in Canada I 
> believe, ground up is enforced.  The rationale is it is first to make, 
> last to break, and you should be able to visually align the plug with the 
> receptacle using the ground pin.
> 
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