welder circuits

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kkrraamm

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I have a 115v 20a 2.5Kw welder w/20% duty cycle
that iam trying to install a circuit for and 630 is confusing to me
:confused:
 
what confuses you ?
630.11 tells you the circuit ampacity is naeplate or based on table 630.11(a)
630.12 tells you to use Tables 6e30.12 for your overcurrent.
from your post it sounds like just a 20 amp 115 v circuit per nameplate.
 
kkrraamm said:
I have a 115v 20a 2.5Kw welder w/20% duty cycle
that iam trying to install a circuit for and 630 is confusing to me
:confused:
Click to expand...

Did this unit come with a NEMA plug installed on it?

Perhaps a 5-20P?

If so I would forget all about Article 630 and just install a 20 amp 125 volt circuit for it. The only reason I know of to use Article 630 is to save money. The use of Article 630 allows smaller conductors to be used and this can be significant if you have a number of large welders, you have one small welder and there is no reason not to run a full size circuit to it.
 
Agree wih Iwire. That cord cap already set the standard per 110.3(B) To figure it out through calculation...you'll be half way done by the time you figure it out. If your really concerned on it, pull # 10, case closed.:)
 
Last edited:
iwire said:
Did this unit come with a NEMA plug installed on it?

Perhaps a 5-20P?

If so I would forget all about Article 630 and just install a 20 amp 125 volt circuit for it. The only reason I know of to use Article 630 is to save money. The use of Article 630 allows smaller conductors to be used and this can be significant if you have a number of large welders, you have one small welder and there is no reason not to run a full size circuit to it.
Click to expand...

I agree with Iwire.
 
welder circuit

welder circuit

I feelt the same way until the customer says he's tripping the circuit.
He's on a 20a circuit now.
630 says multiply the current by .45
and fuse it at no more than 300% ?
does that mean #10 wire and 60a breaker?
 
kkrraamm said:
I feelt the same way until the customer says he's tripping the circuit.
He's on a 20a circuit now.
Click to expand...

What size plug is on it?

You can not supply a receptacle at 300%


630 says multiply the current by .45
and fuse it at no more than 300% ?
does that mean #10 wire and 60a breaker?
Click to expand...

2500/115=22 amps.

22 x .45 = 9.9 amps so you could run 14 AWG.

22 x 300% = 66 amps so you could use a 60, maybe 70 amp breaker with that 14 AWG.
 
I notice that 630.34 Marking calls for the kW rating @50% duty cycle.

In that case the actual kW at full cyccle might be 5kW??
I would be interested to see if some one has direect experince with such an item

You did not mention if the welder came with a mfg installed cord and cap, or is it set up to be field wired.

You are allowed to provide ocp at up to 300% of or rated pri current (as you mentioned)

A 60A fuse/ breaker, should be OK. , I'm not sure where you are getting the 10Ga wire. .45 X 20A = 9A but I do not see where a 10 gage would hurt.
 
Welder circuit

Welder circuit

Thanks Bob
For spelling it out for me
and I think your right about his use
He supposed to be a pro. He fabricates metal stands for his business out of his garage.
Thanks again
Mark
 
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