~ is AC (alternating current) symbol
# direct current symbol looks like this
# solid line on top, dash line on bottom
____
----
https://www.electrical-symbols.com/electric-electronic-symbols/electric-current-symbols.htm
AWG = American wire gauge. Smaller number is thicker than larger number. https://en.wikipedia.org/wiki/American_wire_gauge
UL (Underwriters Laboratories) - safety / certification organization. https://en.wikipedia.org/wiki/UL_(safety_organization)
http://www.ecmweb.com/ops-amp-maintenance/basics-personal-protective-grounding