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Three phase lines in USA
Hello
I'm spanish, my english is not veri good. Exist three-phase lines in USA of 120/208 V or 127/220 V for comon uses (single-phase for houses and three-phase for power)?? Or alwais use single-phase lines of 3 wires 120/240 V?? A house conected to 3 wires, high votage for power - low voltage for lights and general use, make possible connect the 3 wires of house using 2 phase + neutral of three-phase line?? The plug Nema 14-15, make possible connect the 3 wires of house using 2 phase + neutral of three-phase line?? Thanks!! PD. In Spain, cohabit three-phase lines 127/220 V and 230/400 V, 50 Hz, in star system |
#2
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"MaKiNeRo d(Ò_ó)b" wrote in message ... Hello I'm spanish, my english is not veri good. Exist three-phase lines in USA of 120/208 V or 127/220 V for comon uses (single-phase for houses and three-phase for power)?? Three phase power has not been supplied to homes in quite some time. Or alwais use single-phase lines of 3 wires 120/240 V?? Yes. A house conected to 3 wires, high votage for power - low voltage for lights and general use, make possible connect the 3 wires of house using 2 phase + neutral of three-phase line?? No. The voltage between two of the wires is 240. The voltage between either of these "hot" wires and the other wire is 120. The plug Nema 14-15, make possible connect the 3 wires of house using 2 phase + neutral of three-phase line?? No. The old three phase system had four wires. That is 3 hot wires and one common ground. We call that Y connected. Thanks!! PD. In Spain, cohabit three-phase lines 127/220 V and 230/400 V, 50 Hz, in star system Similar to our 3 phase system, but we use 60HZ. Jim |
#3
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"MaKiNeRo d(Ò_ó)b" wrote:
I'm spanish, my english is not veri good. It has got to be better than my Spanish. Exist three-phase lines in USA of 120/208 V or 127/220 V for comon uses (single-phase for houses and three-phase for power)?? Yes and no. 120/208Y, 3 phase, 4 wire, 60 Hz is very common for light commercial installations such as shopping centers. It is not used for residential applications, 120/240, 1 phase, 3 wire, 60 Hz is used for most residential installations. This wiring configuration is commonly known as the 3 wire Edison configuration. It consists of a 240V transformer secondary winding with a center tap. Leg to leg(L1 -L2) = 240Volts Leg to center tap (L1-N) = 120Volts. Both are 60 Hz, single phase, not 3 phase. If you need 3 phase power in the US, it is usually only provided in commercial/industrial areas. HTH Lew |
#4
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In article ,
MaKiNeRo d\(Ò_ó\)b wrote: Hello I'm spanish, my english is not veri good. Exist three-phase lines in USA of 120/208 V or 127/220 V for comon uses (single-phase for houses and three-phase for power)?? *IF* three-phase is in use, it will be 120/208 V, not 127/220V. Or alwais use single-phase lines of 3 wires 120/240 V?? Answer: "It depends". 120/240V single-phase is, by far, the most common. for pure residential use. However, there are towns where some areas have three-phase distribution, and a given house will have "2-of-3 phases" from the pole, giving 120/208 V. Note: in such locales, the customer does *NOT* have any choice as to whether his property is served by 120/240 single-phase, or 120/208 '2-of-3 phases'; the customer gets "whatever the neighborhood is wired for". Bigger apartment (or condo) buildings, are more likely to have three-phase into the building, with "2-of-3 phases" going to any particular unit. |
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