SAFETY (7/15/16)

After completing my temperature automation setup, I discovered (thanks Reddit) that it is not as safe as it should be. Here is a schematic of what I plan on implementing safety-wise:

• Use GFCI outlet (I have been all along, just never mentioned it) - these measure difference in current running in the hot and neutral wires, which should always be zero, and shuts off the power if there is any difference, which would be caused by the current flowing through an alternate path such as a person or water
• Junction boxes around wired elements to protect people from shock and the wires from water or other damage (probably plastic for the arduino/breadboard and metal around the relay because it can get hot)
• Ground the metal box and brew pot/kettle so that if they become electrified the electricity has somewhere to go - I also may ground the heater by soldering a wire to the upper exposed metal

I based the grounding technique on this setup from The Electric Brewery (Step 6): 

http://www.theelectricbrewery.com/node/9?page=show

After I finish researching and actually set this up I will make another post with the results.