about that welder cable

[kencombs]

OK I decided to look it up.
Here is the tableTable 630.11(A) Duty Cycle Multiplication Factors for Arc Welders
Duty Cycle Multiplier for Arc Welders
Nonmotor
Generator Motor
Generator
100 1.00 1.00
90 0.95 0.96
80 0.89 0.91
70 0.84 0.86
60 0.78 0.81
50 0.71 0.75
40 0.63 0.69
30 0.55 0.62
20 or less 0.45 0.55
Here is the calculation process taken from a text book.A. The supply conductors for arc welders must have an ampacity not less than the welder nameplate rating. If the nameplate rating isn't available, the supply conductors must have an ampacity not less than the rated primary current as adjusted by the multiplier in Table 630.11(A), based on the duty cycle of the welder.
Ecmweb Com Nec Code Qa Duty Cycle Table

Let's work an example problem to help hit this point home.

A non-motor/generator arc welder has a primary current rating of 40A with a duty cycle of 50%.
Calculated Load = Primary Rating x Multiplier [Table 630.11(A)]
Calculated Load = 40A x 0.71 = 28.40A

Therefore, the branch-circuit conductor for the welder must not be sized less than 30A. As per Table 310.15(B)(16), a 10 AWG conductor has an ampacity of 35A at 75C.

A c ommon welder is the Lincoln 225. Input current max 50A, 20% duty cycle.
50A x .45 = 22.5 Well under the 30A capacity of 10 ga.

 

[M-MAN]

It isn't that simple.

Yes you can run that welder on a 10g wire IF you stay in the lower range while welding. Turn up the amps and you're going to be disappointed.

 

[Geo-TH,In]

How many use a Lincoln 225 to weld heavy metals??

 

[danofarming]

The factory supplied cord (that plugs into the 50 amp outlet) is 10 ga.

 

[db4600]

I use Sony!

 

[showcrop]

(quoted from post at 04:23:13 10/29/21) How many use a Lincoln 225 to weld heavy metals??

I have never had any success welding any lead, arsenic, cadmium, mercury, aluminum, uranium, strontium, and thallium, with either my 225 or my 110.

 

[Bret4207]

Lots of people because it's what they've got to use. You make multiple passes.

 

[Bret4207]

(quoted from post at 09:16:27 10/29/21)

(quoted from post at 04:23:13 10/29/21) How many use a Lincoln 225 to weld heavy metals??

I have never had any success welding any lead, arsenic, cadmium, mercury, aluminum, uranium, strontium, and thallium, with either my 225 or my 110.

:lol: :lol: :lol:

 

[Richard G.]

My Lincoln 225 buzz box has been on 10 gauge wire from the switch box for 43 years.
I have welded up heavy thick steel and stuff as thin as 11 gauge steel.
Also welded up lots of cast iron, cast steel and spring steel with it.
Just have to know what rods and settings to use.
Burned many thousands of rods with that old buzz box that my Dad bought for me new for $140 in 1977.
Richard in NW SC

 

[kencombs]

Amps do matter. But what matters most is that 20% duty cycle. Stay under that and the math works

 

[kencombs]

I no longer have a Lincoln. But do have an AC/DC welder of similar capacity. Ive had a little MIG, OX/ACE and cheap cracker box welder for years. Gas for brazing and light gauge, MIG for sheet metal and 180/225 cracker box reserved for what you ask,heavier stuff. No 1 or heavier though.

 

[RJKeith]

If you look at the ampacity tables in the National Electric Code Article 310, there is an asterisk for#10 wire that states it cannot be protected by greater than a 30A circuit breaker or fuse. It also states 20 amps for #12, and 15amps for #14.

 

[kencombs]

Yes, but there are also exceptions in the NEC too. The welder use that I mentioned, and there is also another one for air conditioner use.

 

[DoubleO7]

The install instructions say receptacle should be installed with three #10 wires if conduit is used.
If run is 100 feet or more, use #8 in conduit.

Also says protect circuit with 50 amp super lag type fuses.

 

[knightstead]

I'm going to have to agree with Ken on this one. If you look in Article 630 Part II you'll see that the ampacity of conductors for arc welders shall be in accordance with 630.11 (A) and (B). Article 310 is conductors for general wiring, not welding. All of the math and reasoning in the original post looks correct to me.