In order to have power in your home to operate the heat and your appliances, you do need to have electrical installation and wiring. This is one part of the construction phase that has to be done by a qualified professional. You should never attempt to install anything connected with the electricity if you do not have the proper training. The boxes that indicate which Electrical wires are compatible with each hole:
* Connecting switches is done with the black wires found in the cables.
* Wiring used in homes is either Number 12 or 14.
* Always use the same length cable to continue any extended wiring circuit.
When you are connected new wiring to the existing wiring in the home, you should always do so in the last outlet on the run of cable. You can find the last outlet by removing the plate to see how many wires are connected in the outlet. The last one will have wires connected to only two of the terminal screws. The two remaining terminal screws will be the starting point for the new writing. You do have to check to see which gauge cable was used and you have to continue with this.
You can attach new wiring to the box if it is empty. You can trace the cable back to determine what voltage it has so you don't accidentally connect a 120-voltage to a 240-voltage one. Find the white wires inside the box, and attach the new wires there.