yellow_boss
Member
First off, 6/3 is difficult to work with!
I'm installing a 50A in-wall receptacle (NEMA 6-50R) for my welder, a Lincoln Power Mig 256. I have the correct 50A double pole breaker for my panel and it's about a 15ft run from main panel inside the house to the benchtop area in the attached garage where I'd like the box installed. I have 6/3 NMD90 ROMEX copper stranded wire for in-wall run and the sheetrock is already cut and holes all drilled for the cable run. There are 3-conductor wires (red,black, white) and a bare ground wire. I know only need to use two + ground (red, black and bare) for the welder but I want to install 6/3 in case I re-purpose the box later into an electric vehicle charging receptacle.
The NEMA 6-50R receptacle has four mounting screw holes that match up with the mounting screw positions in a standard 2-gang box. So, I picked up a 2-gang box, 2-1/2" deep I think it is, and figured I was good to go. Not so!
Before installing the box in the wall, I figured I'd try to connect and fit wires into receptacle and box then try to tuck it all in while it was sitting on the work bench before diving in to install the job - a dry run I guess you could call it.
After pulling enough wire (6-8 inches, longer for the ground to loop it ion ground screw on box) out of the box to make the connection there is no way those 4 thick, difficult to bend, 6/3 wires are fitting into that 2-gang, no way! So, I gave up, figuring I don't have the correct box for the task.
I'm obviously not an electrician but I have a good understanding of the install process and no fear at all of running the wire and safely making the connections at the receptacle and panel. Can anyone tell me what size box I need to fit that darn 6/3 in there!!??

I'm installing a 50A in-wall receptacle (NEMA 6-50R) for my welder, a Lincoln Power Mig 256. I have the correct 50A double pole breaker for my panel and it's about a 15ft run from main panel inside the house to the benchtop area in the attached garage where I'd like the box installed. I have 6/3 NMD90 ROMEX copper stranded wire for in-wall run and the sheetrock is already cut and holes all drilled for the cable run. There are 3-conductor wires (red,black, white) and a bare ground wire. I know only need to use two + ground (red, black and bare) for the welder but I want to install 6/3 in case I re-purpose the box later into an electric vehicle charging receptacle.
The NEMA 6-50R receptacle has four mounting screw holes that match up with the mounting screw positions in a standard 2-gang box. So, I picked up a 2-gang box, 2-1/2" deep I think it is, and figured I was good to go. Not so!
Before installing the box in the wall, I figured I'd try to connect and fit wires into receptacle and box then try to tuck it all in while it was sitting on the work bench before diving in to install the job - a dry run I guess you could call it.
After pulling enough wire (6-8 inches, longer for the ground to loop it ion ground screw on box) out of the box to make the connection there is no way those 4 thick, difficult to bend, 6/3 wires are fitting into that 2-gang, no way! So, I gave up, figuring I don't have the correct box for the task.
I'm obviously not an electrician but I have a good understanding of the install process and no fear at all of running the wire and safely making the connections at the receptacle and panel. Can anyone tell me what size box I need to fit that darn 6/3 in there!!??

