Installing Receptacle For Outlet

[Devareaux]

Ok, so I'm installing a 6-50R receptacle in my garage for my 225 Lincoln AC Buzzbox. This thing is going directly in from scrap. I'm not installing this thing myself, I will be hiring a professional, but I want to understand exactly what is happening to get an idea of what should be done here.

So far I understand that I..

1. Need the Receptacle
2. Need the 50-Amp Breaker for the Plug
3. Need the Wiring from the box to the Receptacle
4. Need a Conduit?

I'm unsure as to what kind of wiring I'll be needing. I've heard two types so far. One is a Romex 6/3 wire, another is a AWG #6 with 2 other wires minus the sheath so I can pull em' through a conduit? I was looking at a 6/3 Romex and the 3 wire came bundled in a protective outer insulation and looked like that was the winner for my setup.

But then I noticed in my garage everything was ran through conduits, and when I was searching on google, I noticed a few posts saying that pulling wires that are bundled up like that are a no-no when a conduit is involved? I should just buy the the 3 wires and yank em' through the conduit and hook them up one by one? ****EDIT***** |||Confused on differences between THHN #6 Wiring with Conduit and Romex 6/3 Wiring.|||

As you can tell I'm pretty confused about this here wire situation. Any light shed on the matter would be greatly appreciated. Again I'm not doing this myself I'm hiring a professional, but if someone could explain to me what it is I actually need that would be awesome for two reasons.

1. I'll save by being able to buy the materials myself
2. I'll understand what is happening and will appease my tinkering interests

Thanks in advance guys!