127 volt standard voltage?

Maybe 127v is the max voltage the appliance allows.

--

-Mike

According to the World Voltages chart at

127v is the standard in Mexico.

| Dumb question: While reading the instructions for an egg beater, it | mentioned it was "designed for 120 volt or 127 volt use only". The | same was repeated in Spanish. Is this just a mistake or are their | regions of the world where the standard voltage is given as 127 volts? | I know most of the world outside the US/Canada uses 220-240 volt nominal | except parts of Japan use something like 100V, and of course higher | voltages for high powered devices when the low voltage is insufficient.

Much, maybe all, of Mexico supplies single phase power via 2 phases from three phase power. In the US that is known in the power industry as "network power" and is usually 120/208 volts. Now 208 volts sucks. But to get 240 volts from such a configuration, you'd have to have 138.5 volts on line to neutral, and that is a bit too much for most things that want

120 volts. In Mexico they have chosen a compromise where the L-N voltage is just a little high (127 volts) and the L-L voltage is just a little low (220 volts). It's about the best that can be done in a world where many higher voltage appliances are assuming a 2:1 ratio of true single phase power (because someone decided the USA should do this), but the power is actually derived from three phase instead (as most of the world does).

Some countries have 127 volt systems: Mexico and Saudi Arabia for example. They may be either 50 or 60 cycles.

Just curious:

Do "they" make 120/208 (127/220) "2-phase" motors?

IOW: motors wound as 2 phase with 120 degree shift between the two phases. I suppose "they" could even add a third set of windings to take the 208/220 juice.

Seems to me that these would do a lot better than a capacitor run (& start) single phase motor running on the 220.

The only negative, of course, is that protection has to be made against "single phasing" and for some applications (fans and rotary compressors) phase reversal.

On Tue, 5 Apr 2005 11:04:52 -0400 John Gilmer wrote: | | |> Much, maybe all, of Mexico supplies single phase power via 2 phases from |> three phase power. In the US that is known in the power industry as |> "network power" and is usually 120/208 volts. Now 208 volts sucks. But |> to get 240 volts from such a configuration, you'd have to have 138.5 volts |> on line to neutral, and that is a bit too much for most things that want |> 120 volts. In Mexico they have chosen a compromise where the L-N voltage |> is just a little high (127 volts) and the L-L voltage is just a little low |> (220 volts). | | Just curious: | | Do "they" make 120/208 (127/220) "2-phase" motors? | | IOW: motors wound as 2 phase with 120 degree shift between the two phases. | I suppose "they" could even add a third set of windings to take the 208/220 | juice.

Interesting concept. I've never seen it, though.

How about a main winding running at 208 volts, as in single phase, with a center tap, and a small winding going between that center tap and neutral to get 90 degrees?

| Seems to me that these would do a lot better than a capacitor run (& start) | single phase motor running on the 220.

Yes.

One can also derive the missing phase of 3 phase from the 2 supplied phases with an autotransformer pair:

A * \ / \ N B / C

| The only negative, of course, is that protection has to be made against | "single phasing" and for some applications (fans and rotary compressors) | phase reversal.

As usual.

Mexico

Ben Miller

See jeffersonelectric.com/pdf/3-PhaseVent.pdf page 5 for ?Latin-American Voltage? 150°C Rise 600V-class 460V?220Y/127V drytyes.

?s falke

"Ben Miller" wrote...

I work for a radio station, and we've done remotes from Mazatlan, Guaymas, and other beach cities. There seems to be a general lack of standards in the power there. For instance, on one remote I plugged in my neon tester and found a properly-wired socket, with ground tied to neutral.

30 minutes into the program I looked again and saw that the ground had moved to the hot side. I asked a former U.S. engineer who was now a Mexican native about this, and was told that the ground wasn't tied to either side of the transformer secondary.. It just floated.

Another time a laborer was using a long extension cord and pool pump to vacuum sediment from the bottom of a mirror pond. He was holding the nozzle with a rag to keep from getting shocked. The hotel where he worked had a room on the first floor with vents cut into the wall. When you passed it you became aware of a loud hum and the smell of hot iron. Inside was a distribution transformer. The retured engineer explained he thought it was miswired, because it kept burning out and getting replaced with a new one, which was wired the same as the old.

I know Mexico is backwards in many ways. But now we take a small 2 KW generator and make our own, because what we typically get supplied is unreliable and not safe.

The question is, who's responsible for enforcing whatever safety standards there are, because something sure as hell is wrong !!

Thanks,

On Mon, 25 Apr 2005 12:48:26 GMT snipped-for-privacy@broadcast.fm wrote:

| I work for a radio station, and we've done remotes from Mazatlan, Guaymas, | and other beach cities. There seems to be a general lack of standards in | the power there. For instance, on one remote I plugged in my neon tester | and found a properly-wired socket, with ground tied to neutral. | 30 minutes into the program I looked again and saw that the ground had moved | to the hot side. I asked a former U.S. engineer who was now a Mexican | native about this, and was told that the ground wasn't tied to either side | of the transformer secondary.. It just floated. | | Another time a laborer was using a long extension cord and pool pump to | vacuum sediment from the bottom of a mirror pond. He was holding the nozzle | with a rag to keep from getting shocked. The hotel where he worked had a | room on the first floor with vents cut into the wall. When you passed it | you became aware of a loud hum and the smell of hot iron. Inside was a | distribution transformer. The retured engineer explained he thought it was | miswired, because it kept burning out and getting replaced with a new one, | which was wired the same as the old. | | I know Mexico is backwards in many ways. But now we take a small 2 KW | generator and make our own, because what we typically get supplied is | unreliable and not safe. | | The question is, who's responsible for enforcing whatever safety standards | there are, because something sure as hell is wrong !!

The enforcers are just walking away with their bribe money.