And on the rare but still used Delta "High Leg" three phase system. "220" is what the unqualified use to describe 240 volt circuits. 110/115/120/125 can be either single phase or three phase systems and with older areas like here in Philadelphia it can be a two phase system as well. "220" and "240" are the same thing. Come join the discussion about trade knowledge, tools, certifications, wiring, builds, scales, reviews, accessories, classifieds, and more!
that require Two hot-leads/electrical-phases to operate, are rated for 200 to 240VAC of operation. How do you think about the answers? What does that mean and will our 120 volt rated product work with it? Low Voltage:1000 volts or less 5.2. When I read it I understood it but I guess it never sunk in.I know what each system needs to work and how to tell which system I have but I couldn't explain it either. 120/240 is split phase, which is what is delivered to most US homes. the difference between 120/240 volts and 120/208 volts.? Alternating current electric power distribution systems can be classified by the following properties: 1.
one 120VAC @ 0 deg., another 120VAC with 180deg phase difference and one neutral (Center-tap), The 240VAC is used only for major appliances ( Stone, Fridge). Just want to add that 120/208 is a 4 wire three phase system. Some houses get two out of the three phases of a three phase 208 volt line. 120/240 Y 120/208 Y 240 delta on a normal 120/240 transformer you got 1 primary 2 secondary coils rated at 120V 3 bushings on the transformer 120 neutral 120 x1 to x2 is 120 x2 to x3 is 120 x1 to x3 is 240 120/208 i wish i could explain more on … From here you buried a rode into the ground and connected your radio, maybe a fan (if you were rich a washing machine or electrical Ice Box) to the hot lead and the ground (Return) wire. 120/240 is split phase, which is what is delivered to most US homes. Medium Voltage:greater than 1000 volts and less than 100 kV 5.3. The single phase transformer (center-tapped) produces 240VAC.
That means you have two hot lines that are separated in phase by 120º. Three phase uses three Phases (Hot) leads. KISS Posts: 12,510, Reputation: 839. I've had it explained to me in threads here and books. Frequency:50 Hz or 60 Hz 2. Still have questions? edit, as to where the 208 volt number comes from, you need to go into vector arithmetic for that. Here we could talk about 50Hz vs 60Hz Vs 400Hz, Vs 480V, Vs 600V, Vs Delta windings, Vs Wye transformer windings,, and other things that might make a mind explode, but we won’t. ... We offer our unit in a 120 or 277 volt version. If you still have that electrical rod buried in the ground and measure from it to anyone of the three phases (Lead to ground) you will still see that same 120VAC that was present when outhouses were still in fashion!!!
these are 120VAC between Line-to-Neutral. High … All electrical appliances (All that I know of !!!) These voltage are referred as Line-to-line Voltages. A customer just told me he is using a "120/208" system. We spec the transformers from several large power companies. Each phase is 120 degree's out of phase from the other phase (Hot) lead. 240 and 208 volts require 2 sources offset by a fraction of a second called a phase.
Alternate meaning for 120/208 is a three phase system, with 120 volts from each of the three hot lines to neutral, and 208 volts between any two of the three phases. The first Electrical distribution system devised was “SINGLE PHASE DISTRIBUTION” It only sent one HOT-Lead/Single-Phase line to the house. I must install 30-50 120/240 3 phase Delta services each year, in brand new industrial parks. However, most of these units are available in 110 volts and 220 volts. OK, just to be a smart-alec, lets throw the grounded B system in. 120/208 has several meanings.
How can California force other countries to stop building coal-fired electrical generating plants? Can you explain the PCB fabrication process in detail? They will work on 208VAC or 240VAC!!! Two Phase Transformers produce two phases ( "HOT") leads. 208VAC voltage sources are obtained by connecting. Anyone have an easy answer for this, or maybe a good read explaining it? 'SNL' had a live audience. The dimmer for a ceiling light/fan combo in the bedroom stopped working. that will supply up to 240 volts. Something called an Air conditioner that had a high BTU rating required TWO HOT leads to make it work. i.e. Deltaconnected systems typically do not have a neutral 5.
5,369 Posts #2 • Jun 5, 2010. florint23 said: whats the difference between a 120/208 and 120/240. Neutral present: 4.1. In a industrial setting, they are more efficent. Why do people think that a 3 phase Delta system is old and being phased out??? The fundamental difference is Three Phase vs single Phase distribution system... 120/240 is a single phase system...... typically used in. But its down again so I'm calling a tech what is your oppinon on the problem? how do you reduce a car brake light bulb from 21w to 5w with resistors? Number of phases:single or three phase 3. What would cause such disparity? i have 3 hot legs coming in over head, and i …
The vent blower doesn't start each time the heat unit comes on. Had a guy ask me what differences are between the 3 208/220/240. I am using a single zone mini split ductless heat pump for heating and cooling. The wye common point connection makes this a neutral point three phase cycle has 120 moments in any second in time when a sine wave is crossing zero volts in the cycle of the sine wave each phase is at a point the voltage will not be 240 volts but 208 volts on a wye transformer . not much, AC voltage ratings are RMS values. This is were the "B" phase has 230 volts on a single leg. Trump changes course on coronavirus relief talks, AOC concerned with Trump's 'perilous medical state', CDC director urged to expose White House, fire himself. When trying to replace it with an electronic dimmer swich, nothing would work, so I measured voltage from the wires in the box. So all these 3 phase 240 volt motors are just useless..... or they are gonna need their own transformer??? You can sign in to vote the answer. What's the difference between a 120 volt and 120/208 volt system? Vince pretty much summed it up.
120/208 has several meanings. As I started to answer him, I realized I could not answer him with an answer that was understandable for a green guy. I have researched this (asked a few POCO reps from different areas in the US) at Electric West in Vegas this year and they all told me that was a crazy notion. Seems like it has to do with phase relation and transformer type. Delta systems are being installed all over the US, everyday. The more I learn the less I seem to know...... Had a guy ask me what differences are between the 3 208/220/240.
Voltage classes: (ANSI C84.1-2016) 5.1. The 3-phase output consists of three 12OVAC lines with voltages signals being 120 degree apart from each other. What is left to discover or invent for the at home hobbyist scientist/engineer.
Uber Member : Dec 2, 2009, 08:02 AM 208 is usually 3 phase.
I have customer that needs to upgrade his service from 800Amps to 1200Amps. These voltages are all with in the same system that's why the word "nominal" is used. Why do people think that a 3 phase Delta system is old and being phased out???
Two phase distribution is still widely used in rural areas where residential use and minimal commercial power is consumed, and still very popular in third world countries that have limited electrical distribution. The Delta system is a 3 wire three phase system and the voltage is usally 230 volts single phase between any two lines and 230 volt three phase with all three lines. He currently has a 120/240V 3 phase system and a 120/240V System With 2 separate Meters.
We offer our unit in a 120 or 277 volt version. The 120/208YVAC system describes the output of a. It went home with paychecks. The first is less common. This type of connection is referred as a WYE configuration.
3 phase transformer, used only in commercial applications. 240 and 208 differ by a fraction of second that the phases are apart. I had 122V from black to black but 81V from red to black.
It has been calculated that I need a 12,000 BTU unit. 1. the phases are 120 volts.you have 3 so 2 are 120 volts and the 3rd is the neutral. the transformer at the pole will be configured to send phases of voltage to the location. this is for commercial and industrial locations that use motors and stuff like that. You have essentially 240 volts center tapped, so you have two 120 volt lines 180º out of phase, ie, 120 volts hot to neutral, with 240 volts between the two hot lines. Review the attached diagram and see how 120 volts is dereived from a 120/208 Volt WYE system. You have essentially 240 volts center tapped, so you have two 120 volt lines 180º out of phase, ie, 120 volts hot to neutral, with 240 volts between the two hot lines. So, please let me know where this information comes from. (The same voltage has the old single phase distribution), In the never ending demand for more power (Dam Scottie and Captain Kirk for starting this trend), three phase is the most efficient generation and distribution of the three systems. What does that mean and will our 120 volt rated product work with it? Both systems will produce 120VAC (“HOT LEAD to Ground/Nuetral) (Phase to Nuetral reference).
either line is 120 volts to neutral, and 208 volts between the two hot lines. Each lead used in reference to ground gives 120VAC. the difference is the measured 208 volts between these phases A B / B C / C A . Get your answers by asking now. First of all, a double pole circuit is actually a single phase circuit. Delta systems are quite rare nowadays, at least in my area where the poco has long since phased them out (pun intended.). I am advising that he upgrade and go to a 1200Amp 480V 3 phase system and transform down for existing loads. the conversion that allows 208 is known as the high leg and it is usually in the center of the buss bar so all will know that it is not the same as the 120 (no matter what the color of the wire is). 240 volts can be obtained from either a 120/240 residential system or a 240 volt 3-phase delta system. The type of connection is referred as a DELTA configuration. 120/240 Delta seems to be a slightly better choice solely based on voltage. Two hot legs @ appx 120 to gnd, one hot leg @ appx 200 to ground, 240 between any two. I thought that the power companies like the delta system because if 1 of the 3 transformers goes down they can in an emergency reconnect the 2 to an open delta configuration with the same voltages,mind you having only 58% of the va. A forum community dedicated to professional electricians, contractors, and apprentices for residential and commercial work. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 120/240 is split phase, which is what is delivered to most US homes. The first is less common. Some houses get two out of the three phases of a three phase 208 volt line.
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