Holy Batman! People reading these forum builds need to realize that just getting a controller does NOT get you something that is UL approved. What that means is that safety is up to the builder!
This is like wiring up electrical boxes in your house. The building codes used in wiring electrical boxes, which includes the types of wires, the boxes, and how the wires are connected, are there to prevent fires. The wiring methods and ground connections are designed to prevent shorts, and the box is designed to contain the heat/spark if one does occur.
Product design has a similar set of requirements in order to get UL or CSA approval. I highly recommend that those who question their abilities or knowledge of wiring either buy a plug and play unit or get help in building one of these. It's tempting, I know, to save a buck but house currents and voltages have caused homes to burn down.
Rich