Hi, I have a dryer in my garage using a 10-30 receptacle. I'm purchasing another device to use in my garge which is 240V 24A and uses a 6-30 plug. I could change this plug to a 10-30 and then simply plug/unplug when I need to swap over from the dryer but this would be a pain to do and I've read that 10-30 recepticles are not designed to handle frequent plugging/unplugging (I'll use the new device daily).

I would just wire up a separate dedicated 6-30R but there's no room left in my sub-panel for another 2P 30A breaker. And to run a new dedicated line from the main breaker to my garage would be very expensive and require upgrading my home service from 100A to 200A plus require city permits etc. And gets extremely costly.

So instead I was planning on using 2 surface mount recepticles (10-30 and 6-30) and a 30A DPDT AC switch so that I can plug in both devices but use the switch so that only one of them can be used at a time. I would remove the existing wall 10-30R and run conduit to the AC switch box (hard wired). As an added advantage, the switch features a center off position allowing me to de-energize both outlets. Since I couldn't use both circuits at the same time I don't see this as any different than simply plugging/unplugging so I think this should be okay but want to verify.

I reviewed articles 210 and 220 in the NEC but couldn't find anything specifically prohibiting this. I've heard dryers have to be on a "dedicated circuit" so I don't know if this would technically be violating that rule? Can someone please let me know if this would be breaking code and if so please cite which code(s) specifically?

Thanks for your help!