Posted by kencombs on October 28, 2021 at 22:06:52 from (108.208.32.113):
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.
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