Arc welder ckts on 480 3 phase panel

[tld38]

Two existing arc welders. One is Invertec V250-S, other is Invertec (V350 PRO input current @ 460V is 23 amps) (input current for Invertec V250-S @ 460V is 16 amps.) Both welders have 3 foot leads with 10AWG SOOW cord. no plugs on ends. Existing 480V 3phase 400 amp panel has two 60 amp spare 3 pole brkrs, 1-50 amp 3 pole spare brkr, and 1-40 amp spare,3 pole brkr. This is an older FPE 480V panel. Was thinking of buying two, 3 phase Fused 600V 60 amp disconnects with 3-30 amp super lag fuses for the V250-S and 3- 50 amp super lag fuses for the V350 PRO. My only concern is the protection of the #10 SOOW whips from the welders. Any suggestions are appreciated

 

[hillbilly1]

Is this a spot welder?

 

[tld38]

Is this a spot welder?

No, it is not. I should be able to feed the welders off the existing brkrs, but I am worried about inrush current. Also I don,t want to protect the #10 SOOW with a 40 or 50 amp brkr. That is why I am thinking about the super lag fuses. This is a temp situation. The welders are doing some work for a day or two, then the welding equipment will be removed.

 

[tld38]

No, it is not. I should be able to feed the welders off the existing brkrs, but I am worried about inrush current. Also I don,t want to protect the #10 SOOW with a 40 or 50 amp brkr. That is why I am thinking about the super lag fuses. This is a temp situation. The welders are doing some work for a day or two, then the welding equipment will be removed.

Let me rephrase that. The 40 or 50-amp spare would handle the inrush current, but my concern is the requirement to protect the #10 SOOW leads at the welders. That's why I was considering the 30 amp super lag fuses for the protection. The manual recommends super lag fuses or breakers, at 30 amps. I just do not have a 30-amp spare brkr. So, I either go to the 40 amp brkr, or install new fused disconnect for the super lag 30 amp fuses. This is in regard to the Invertec V250-S Arc welder.

 

[Joethemechanic]

I don't think it;s ever going to overheat that #10 SO cord. The current is limited by the load. Not to mention the duty cycle is most likely low, and at lower welder amperage settings the amperage draw on your 480 supply is going to be significantly lower than the max listed.

Myself I have run those machines from receptacles rated lots higher than what you are talking about just by installing a the matching plug.

Personally I wouldn't loose sleep over it

What the code says, is something best left up to others on this site.

 

[tld38]

I don't think it;s ever going to overheat that #10 SO cord. The current is limited by the load. Not to mention the duty cycle is most likely low, and at lower welder amperage settings the amperage draw on your 480 supply is going to be significantly lower than the max listed.

Myself I have run those machines from receptacles rated lots higher than what you are talking about just by installing a the matching plug.

Personally I wouldn't loose sleep over it

What the code says, is something best left up to others on this site.

Thanks much.