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Relay Shield example hookup diagram needs clarification/warning
Diagram needs to point out that the HOT lead is the one that needs to be switched, and the user should be sure to use a polarized plug to ensure it stays this way.
See conversation here: https://community.particle.io/t/confirm-relay-shield-sample-image/15521
EDIT: We should also add some general purpose warning and disclaimer in the relay shield docs. That is, a nice and SCARY 🔥 ⚡️ WARNING right up front that if you use the Relay Shield for anything other than low voltage DC it can be hazardous. Suggest that anything permanently wired up for use in the home should be inspected by a licensed electrician. Observe local building codes, etc..
cc: @mohitbhoite
And don't rely on color coding! As the discussion shows - other parts of the world have completely different color codes. e.g. Central Europe (hot black, switchetd hot black/brown/..., neutral blue, ground yellow-green) Germany, Austria and a bunch of others only have symmetric plugs, so you'll never be sure if you've got the hot or the neutral switched.
Another color issue on the Relay Shield wiring might be the DC screw terminal (GND-red, VCC-black). Shouldn't it be the other way round?
A good idea for wire coloring might just be to make them all black, and point out the switched side is HOT.
Another color issue on the Relay Shield wiring might be the DC screw terminal (GND-red, VCC-black). Shouldn't it be the other way round?
Oh man! Nice catch @ScruffR! I didn't even see that until just now squinting at the silkscreen in that image. Yes those are reversed.