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![]() "T o d d P a t t i s t" wrote in message ... | john smith wrote: | | | Ahhh! But where does the 240 come from? | Does it not come from two of the three legs of a Y or Delta? | | It doesn't matter where the 240 comes from, it matters what | the phase of each wire is relative to some reference. The | US (and Europe, but at twice the voltage) use a 3-wire, | single-phase, mid-point neutral distribution system for most | residential loads. If you use the neutral as the reference, | then there are two opposite phase wires or split phases. If | you use the opposite wire as the ref, then there is a single | phase 240 volt signal. | | Commercial sites receive 3-phase power, not single phase. | The voltage difference between two of the three legs in that | system is 208 volts, not 240 volts | | These are square root and cube root functions. | | No they are not - they are trig functions depending on phase | angle. | | If they were 180 out of phase, it would cancel. | | Phase depends on the reference. You can ignore the neutral | and just see it as a single phase 240 volt system using | either hot lead as the reference. If you prefer, you can | think of one hot lead as being the reference, the neutral as | having a 120 volt signal on it and the other hot lead as | having a 240 volt signal in phase with the 120 volt signal | on the neutral. | | | | | | -- | T o d d P a t t i s t | (Remove DONTSPAMME from address to email reply.) | | Make a commitment to learn something from every flight. | Share what you learn. Came across this: If you have three phase (Y or Wye, which is fairly commonly provided to businesses or industries but not common in homes) electricity, you can get a ``sort of'' 240 volt circuit out of it by running between any two of the three phases. The phase difference is only 120° instead of 180° so one ends up with only 208 VAC or so between the wires. This is enough to run most 240 VAC devices simply because the manufacturers aren't fools and know that Y/Wye supplies are fairly common. This is also true for a lot of computer equipment that requires 240 VAC (like some racks or uninterruptible power supplies (UPS) or some big-iron computers). Taken from this site: http://www.phy.duke.edu/~rgb/Beowulf...ok/node60.html -- Jarhead ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
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