Application for attic gable fan
Mike ~ I did something similar when I installed a new attic gable fan. The fan was hardwired into the 20 amp feed line which meant that I had to go back down to the main breaker box to cut off the power. I realized that some time in the future, I would need to do maintenance on the fan (e.g. clean out wasp nests, clean the fan blades, etc) and needed to be able to turn off the power at the fan. I also wanted the ability to plug in a trouble light or run an extension cord from the junction box. I built a duplex and switch in a junction box and used a grounded computer cable for the fan line. The main feed line is hardwired into the junction box. In this case, it technically is not a portable extension cord as described in your post. When I want to remove the fan, I simply turn off the power at the switch and unplug the fan cable from the socket. But if I still want power for a trouble light or another power tool, I turn the switch back on. The attached photos and wiring diagram tell the story. If the electricians in our forum would like to check out the accuracy of the wiring diagram, please jump in.
Last edited by Web Shepherd; 11-27-2014 at 10:30 AM.