Setting up power for 208 Welder

[SPK]

Hi,
I want to install two 50 A receptacles for two welders I have off two 2 pole 30 A breaker's in my shop.
Can I run the two receptacles and a ground through a 3/4" EMT, the run is approximately 140 ft so 5 #8 (4 hot's 1 ground) or do I need to keep them separate. There is an empty 1 1/4" Conduit from the panel I was going to use to get me 50 ft from where I am putting the two receptacles.

Thank you all for your help!

 

[Dennis Alwon]

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