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Wiring for welder. Went to an auction and...

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JRT

04-01-2001 07:38:56




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Bought at Millermatic 250 for $600. I will be wiring it up to a 50 amp 240 V in the future. In the meantime...

Several years back I had power run to a post near a shed. I asked that they wire it with a 240V circuit for future welder use, as well as 120V. They did so, using 10 Ga wire and a 30 amp breaker. I had anticipated 50 amp- but was not specific, and its too late to complain now. I also have access to a circut for the clothes dryer- also 30 amp. Do I have any risks in using this welder with the 30 amp outlets I have access to? I assume at worst I will trip the breaker, and then if welding steadily with larger wire sizes.

I have also downloaded an owners manual, and it indicates for 220 and 230 volts "minimum input conductor size" of 10 ga with max length of 75 ft. This does not match with what I see for house wiring or for extension cords. The same manual has one part number for the cord set "250V 8-10 ga 12 ft" and receptacle rated 50 amp. Does this all make sense? I need a longer cord. Whate gage should I use?

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JAMES KILEY

05-06-2005 17:43:47




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 Re: wiring for welder. Went to an auction and... in reply to JRT, 04-01-2001 07:38:56  
Hi,

I need to wire a spa (220V) to my home breaker I need to run it 215ft through conduit, what gage wire should I use?



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Franz

04-01-2001 14:38:14




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 Re: wiring for welder. Went to an auction and... in reply to JRT, 04-01-2001 07:38:56  
Sort of depends on how hard you're driving the welder. The machine will only come up to max amp draw at full output, so if you're welding at the lower ranges, you'll have plenty of input power.



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Brian G. NY

04-01-2001 08:00:12




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 Re: wiring for welder. Went to an auction and... in reply to JRT, 04-01-2001 07:38:56  
The length of the run makes a big difference in the size wire needed. A 100 ft. run for 50 amps requires #6, and a 200 ft' run requires #2. This is aluminum conductor direct burial wire. Overhead wire can be somewhat smaller, as can copper. I put 100 amp service in my barn which is 250' from my 200 amp entrance box in the house. I used direct burial #00 aluminum "triplex" enclosed in 2" PVC conduit. This is probably just barely enuf for a full 100 amps but the fact is I will never be drawing a full 100 amps at any single time. Using the next larger size wire than recommened will give you a sense of security; besides, marginally sized wire can result in excessive voltage drop which can be very harmful to your equipment.

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Bus Driver

04-01-2001 17:38:34




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 Re: Re: wiring for welder. Went to an auction and... in reply to Brian G. NY, 04-01-2001 08:00:12  
To explain the information furnished withn the welder, the National Electrical Code Article 630 permits smaller wire for supplying welders than would normally be used for other circuits if the duty cyle of the welder is less than 100. For an individual welder with a duty cycle of 50 for example, the wire size must be rated (Table 310-16) at 75% of the amperage draw of the welder. If the welder in our example draws 45 amps, the wire would need to be rated at 33.75 amps minimum. The wire has opportunity to cool at the same time the welder is cooling. Rest assured that the manufacturers' recommendations have been subjected to the code rules, so follow them with confidence. However, there is no harm in oversizing the conductors. May prepare you for additons for the future.

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Bus Driver

04-01-2001 17:42:31




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 Re: Re: Re: wiring for welder. Went to an auction and... in reply to Bus Driver, 04-01-2001 17:38:34  
This forum does not encourage long posts. In the example above, the breaker would still be 45 amps. Some motor circuits also appear to be "over fused" for reasons too lengthy to explore here. Pity the electrician who encounters an inspector who does not understand the code Article 430.



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