Master Electrician Dad teaches Son how to Deal with Commercial Lighting using a Contactor, Thoughts?

customer wanted us to install one light switch at the entrance of a warehouse so that when the manager comes in they want to turn one switch on and the whole facility goes on and then when they leave they want one switch [music] to turn the entire facility off. Which contactor would you use and how would you wire it? And that's what we're going to show you right now. Why would there be 12 terminals on a contactor? >> You're asking me. >> I'm asking you. >> Three-phase [music] >> threephase panels. That's why contacttors normally come single pole two pole three pole 6 9 12 15 because of that brown orange yellow brown orange yellow brown orange yellow brown orange yellow >> that it's 120 volts so it would be black red blue cuz it's 120 not because lighting commercial lighting will be 277 volts this coil is 120 why do you think This coil is 120 volts >> because of uh lighting and outlets are 120 >> because of the time clock and the photo cell. So, keep in mind that what controls this is a time clock and a photo cell and a light