Conductor for Welders

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How do we size the conductor for two 60A (480V) welding receptacles in parallel?

NEC section 630 mentions two types of welders (arc and resistance), but it is hard to predict which type they will use in the future in the industrial plant. Also generally only one welding receptacle will be used at one time, so should we size the conductor for one receptacle, or for two receptacles?
 
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