I have a 200 amp service panel that I left two spaces empty for a 100 amp breaker for a welder. A few years back I added a 100 amp sub panel wired with #3 THN wire, and maybe a #6 ground wire. I still have the two empty spaces. The 200 amp panel is very crowded with wire. Question is, would it be a bad idea to wire the welder from the sub panel? The sub panel is wired from the 200 amp panel from a 100 amp breaker. The welder draws maximum of 60 amps, but the manual with the welder said to fuse it at 100 amps. The idea was to come from the panel with #4 copper to a disconnect then to the welder. I already have the disconnect with 100 amp fuses in it. One more question, would I need to run a ground wire from the disconnect to the panel if I used plastic pipe to run the wire in?
The welder is a Miller Dialarc 250 amp with high frequency that I bought new back in the early 1980's. It might have one hour of running time on the machine. The warranty ran off the machine sitting on the pallet it was shipped on. When I did wire it up the cooling fans bearings started making a noise so I always used another welder. I need a TIG machine now so I want to get it wired up. Any help would be appreciated, thanks.
The welder is a Miller Dialarc 250 amp with high frequency that I bought new back in the early 1980's. It might have one hour of running time on the machine. The warranty ran off the machine sitting on the pallet it was shipped on. When I did wire it up the cooling fans bearings started making a noise so I always used another welder. I need a TIG machine now so I want to get it wired up. Any help would be appreciated, thanks.