Dedicated power

Can anybody out there explain to me why you would use 10 gauge wire to run a 20 amp circuit? I was told by my electricians through the years that the national electrical code basically builds in a safety factor of 25% through all of their rules. So going with 10 gauge wire for a 20 amp circuit is even more overkill and basically a waste.

That’s the breaker but what do you put in the wall as a receptacle? The only one I’ve ever seen is the style fits 240 V like a dryer plug. I’ve never seen one that would be like a single pole receptacle like you normally have in your wall. Does anybody make an amp that needs to hook up to a dryer receptacle?

Lowrider 57, I don’t think a 30 amp single pole outlet even exists. I thought 20 amp was as high as they went. I’m no electrician but I’ve been in construction for 35 years and I can’t say I’ve ever seen a 30 amp single pole outlet. There may very well be I googled it and I couldn’t find a picture one. Are there any amps out there that run on 240 voltage, not counting the ones that are designed for European use. If anybody can’t show me this 30 amp Outlet I’d love to see it. Thanks

Can somebody Out there show me what a 30 amp receptacle looks like? The only ones I’ve ever known of that were 30 A were 250 V