HVAC Basics: Electrical - Project 2 Wiring a Three-Way Switch

[@JoseGuerrero-sj5ie]

Thank sr for the great video your the best teacher

[@PBS-nm1uu]

this is the best video i have seen, place keep making more thanks a lot .

[@NETWizzJbirk]

This is a great project project, but I would suggest a few changes, please. The NEMA code adopted by most States requires a Neutral be present in every box now. I would recommend putting the boxes right next to each other such that students are thinking source to destination or line to load... If they wire something like this in real life, they need to be thinking circuit breaker to load. Anytime a white is used as a hot wire, traditionally good electricians wrap a piece of black electrical tape over it to mark it, but because the new NEMA 2011 a neutral must be delivered to every box and may as well deliver that via white, so... I would do this project by reading order box, box, fixture with the power-cord being the classroom equivalent to the source or breaker panel. Then to meet the code, you would use a 14/3 Romex between the two switch boxes such that you are carrying black, white, ground, and red between the two switch boxes with the red and black as the traveler wires for the three-way switches. From the last switch box to the fixture I would recommend the normal 14/2 Romex (no red wire in that). Connections would be Power cord ground bonded to box box bonded to switch, neutral from power cord connected to white on 14/3 (has black, red, white, ground) and passed through to next box. The Black from the power cord goes the common terminal on the switch. The two common traveler screws on the switch then go to red and black on the 14/3 that caries it with the neutral to the next box with the neutral. Of course, the ground is also connected on the 14/3 to the first box and then to the second box and switch. The 14/3 coming into the second box has its red and black go to the traveler pair. Then the common terminal on the switch in the second box goes to the black of a 14/2 and into the fixture box. The 14/2 white is connected to the 14/3 white to pass the neutral into the fixture box, and obviously the ground of the 14/2 is connected to the second box ground as well as the fixture box ground. Undoubtedly the fixture is grounded with a pigtail or similar. Then the 14/2 black and white feed the fixture. To me this makes the most sense because students can think line to load, left to right. It meets the new code, neutral is always white all the way through, etc.