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.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
