Originally Posted by Pork Dork
Thanks for the correction on the 4 probe thermometer. Damn. I thought I had a good line on a cheap 4 probie. I guess I will not order one. You just saved me 15 bucks which is all right in my book. I don't care what others say about you.
Now lets chat about the 220V vs 110V. You say that power company will charge you the same to operate both. Then why do most light to heavy industrial and wood shops use 3 phase 440+V with the idea that they are saving money from the power company?
If 110V costs the same to run as 220V or 440+V what's the difference other than the lethality of the electricity. I mean I'll take a 110V zap and walk away but 220V or 440+V can kill you. Not that I'm going to install 3 phase on my house or anything I just want to be informed so I don't come off half cocked. When giving advice I usually prefer to be fully cocked.
Ok I'll give you a quick explanation without getting into an in depth technical discussion...
Industrial shops don't run 3 phase with the idea that they are saving money from the power company - most 3 phase is billed out as an "on-demand" service & can be quite expensive. The reason they use 3 phase on a lot of machines is due to a number of reasons. 3 phase motors have less parts so they are cheaper. 3 phase motors run cooler & are slightly more efficient so they have greater longevity. Higher hp motors are only available in 3 phase.
A single phase motor has 2 magnetic fields 180* apart while a 3 phase motor has 3 fields 120* apart. Since the single phase motor only has the 2 fields opposite each other when electricity is applied to it, it will not turn. Therefore a single phase motor requires extra windings in the form of a starting circuit & run capacitor to get it going. This adds to the cost of the motor & is why it runs hotter. This is why you rarely see a single phase motor larger than 10-15 hp.
Hopefully that answers your question about businesses so on to the 110 vs 220...
The electric company charges you for the POWER that you use. Power is equal to current times voltage. Lets say you have 2 different motors that are each rated 2200 watts at full load. One is wired to run on 110V & the other is wired to run on 220V. The 110V motor will draw 20 Amps of current while the 220V motor will only draw 10 Amps because it is running at twice the voltage. With either motor though you will still be using 2200 watts of power so you will get charged the same.