Quick Course in Electricity - Page 3 - Router Forums
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post #21 of 28 (permalink) Old 01-13-2018, 11:56 PM
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Thanks Dan. That helps a lot. Looks like a motor would be near the peak of the voltage at all times with 220/3 phase, vs half the time with 110 single phase. So Red & Green wires are both hot, but in 110 you only use the black, plus neutral. So, does a 220 motor have separate windings for each hot line?
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post #22 of 28 (permalink) Old 01-14-2018, 02:25 AM
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Mechanical I can figure out. Electrical, might as well be magic, I don't understand magic either.
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post #23 of 28 (permalink) Old 01-14-2018, 12:10 PM
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Thanks Dan. That helps a lot. Looks like a motor would be near the peak of the voltage at all times with 220/3 phase, vs half the time with 110 single phase. So Red & Green wires are both hot, but in 110 you only use the black, plus neutral. So, does a 220 motor have separate windings for each hot line?
Green isn't a conductor,Tom. Here, in N.America, it's always the ground wire, or in some cables it's bare copper...in theory it shouldn't actually be carrying any current.
single ph. 120V black & wht.
2 ph. blk red @ wht.
3 ph blk, red, blue & wht.
In 240V (220V) electric heating ccts. they use a cable with red and black conductors, no white neutral required. If it's Non-metallic sheathed cable (Loomex/Romex etc) the outer nylon sheath is red in colour so you know that's what the cable is being used for. In older wiring the cable is supposed to be identified with red marking every few feet.
If you have an electric HW tank, the cable could be #12 ga with the red outer covering, if it's maybe 15 yrs. or newer(?)...

"So, does a 220 motor have separate windings for each hot line?"
[/QUOTE]
I think you're correct but I'm going to defer to anyone who actually works with this stuff...
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post #24 of 28 (permalink) Old 01-14-2018, 01:56 PM
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Further to what Dan said, in 220 - 240 volt circuits no neutral is necessary unless you have an auxillary piece of equipment that needs it. For example an electric stove or oven usually has a light, timer, and maybe a plug in for a toaster or such. In that case you also need the neutral wire and the circuit works by tapping into one of the two hot legs and connecting the other side of the device to the neutral.

If you are connecting a motor, as to a tool in your shop, it only needs the red, black, and green. All electrical devices where the case or frame has the potential to be energized if there is a short must be grounded. That's the only time the ground wire should ever carry current. The black and red act as return wires for each other so no white is needed. You can switch just one wire in a 220-240 volt circuit because of that.

I also think that the motor would have 2 sets of windings but I'd let an expert confirm that.
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post #25 of 28 (permalink) Old 01-15-2018, 11:33 AM
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Its called magic smoke. Once you let it out there is no more magic
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post #26 of 28 (permalink) Old 01-19-2018, 08:48 AM
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I worked in the electronics industry for almost 30 years. I started with tube gear in the 1970's (Military Gear) and finished with Field Programmable Gate Arrays (FPGA's) in the early 2000's. The one thing I learned that will always stick with me is what comes out of most electronic devices will burn you, what comes out of the wall will kill you. I have been zapped by 25,000 volts at a few micro amps and it really smarts but I have seen people knocked flat on their behind (and that's being lucky) from 115 Volts at 15 amps.

When I was a kid, my father rewired the fuse box ( the old screw in fuses) to a circuit breaker style box. My dad wore a belt with another belt hooked up to it. My mom would stand behind him holding the second belt. He told her, "if you see me shaking" pull hard on the belt. At that time, I thought, How Brave, later I found out, How Stupid. That would have been 220V at 50 to 100 Amps.

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post #27 of 28 (permalink) Old 01-19-2018, 09:34 AM
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I've always found that once you let the smoke out of anything electrical, it just didn't work the same....
That simply proves that electronics, especially transistors and integrated circuits work using smoke, once it escapes the device no longer works!

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post #28 of 28 (permalink) Old 01-19-2018, 12:00 PM
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!...I know this from personal experience.
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