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Okay...I went with the SP and just finished putting it in place
Everything is working perfect.
All advice is appreciated
Thanks to everyone!!!

Okay here is what I am going to do. I have decided to do one or the other of the following depending on cost vs work involved.

option one:
replace the 30a DP with a 20a SP and move the white wire...

Got it...I'll replace my DP with a SP in the main and do that.
Thanks for the good answer....I've asked several people on other sites and I kept on getting vague answers that never helped me. A...

I have a 2 wire 240V line running to my garage off a double pole 30 amp breaker from the main panel.
This line has no neutral wire. The previous owner had an air compressor dedicated to this line. I...