A couple of things.
What type of welding machine is he going to use?
What is the max input amps of that machine? ( if you get a brand and exact
model we can likely look it up on the makers site )
What setting will he likely use? ( how high will he turn it up? )
The oven, is it a industrial unit or a home cooking oven?
What is the exact input amps? If it is a home oven you need to know the amps
of the oven element only. The range top elements can be disabled so you won't
over load the house wiring in case they are turned on.
What is the breaker size for this run?
If you do extend the wiring,don't mix Al and copper, be sure to get cable
clamps rated for aluminum wire and use the black anticorrosion gel before you
put the wires together. The cable clamps are a nut/bolt unit that has a slot
cut down the center of the bolt.
Harold
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