But don't violate intended use and its best to spend an extra $30 and only give him a J&P and a local disconnect so some unknowing and subsequent homeowner doesn't plug in a dryer and sues you for burning the house down. What happens if a subsequent unknowing owner sees the dryer type outlet that you installed and concludes they can plug their dryer into it? With AWG 12 NM wire, you will eventually have a house fire that you may be liable for. Add the fact that most guys violate intended use and just use a dryer or stove plug in the garage for their welders, you have a real problem. They just overheat and so you are playing the game of which overheats and burns first: the branch circuit wire or the buzz box. Industrial welders are usually fed by conduit, hardwired, and they have thermal cutouts for overheating. But for residential, I would worry, especially since most violate intended use and also since wires are seldom in conduit. compare Electrode Holder 200-2500 Amp (Pack of 12) compare GearWrench 2957D Beam Torque Wrench (0-150 Feet/Pounds 1/2-Inch drive) compare GHP Cut40 Inverter Plasma Welding Machine & Regulator Gauge Set. Art 630 works great in an industrial setting and you have qualified people working on electrical. compare CDI 1003LDFNSS 1/2-Inch Drive Memory Needle Dial Torque Wrench Torque Range 0 to 100 Feet Po. Good discussion, but like any standard, NEC is a minimum and there has to be context. I always appreciate it when more learned electricians share their knowledge. When I ask questions I'm not usually looking for a "mechanics" answer but real understanding on how the NEC works. What brought this question on is that I have two future welder outlets I'm planning for in a shop and I was trying to figure out the most efficient way to wire them in.
Seems the only place this is addressed is 210.21? Says a outlet can't be rated less than the branch circuit ampacity but what about more than? I don't understand what exactly 210.21(B)(1) is getting at. In this example if you run #12 protected with a 50 amp breaker what amperage receptacle are you limited to? I would imagine the welder comes with a larger cord that isn't going to be conducive to using a smaller plug and receptacle.
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They are very non-committal and explained that the welder has a 20% duty cycle and that the 47.5 is the primary rated current. Pulse Jewelry Welding Machine Sparkle Spot Welder Gold Silver Platinum 800W 80A 213.75 Was: 225.00 Free shipping or Best Offer 110V/220V 80A DX-808 Pulse Sparkle Spot Welder Gold Silver Jewelry Machine Tool 219.95 0 bids 99.99 shipping 2d 16h Pulse Sparkle Spot Welder 800W Jewelry Welding Machine Gold Silver Platinum NEW 215.01 9. I had even called the welder company in that example to ask them about their numbers. Having read 630 I "thought" I understood it but wasn't sure. I would like to thank you for explaining this in depth.
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