Running motors at a lower voltage will decrease the life expectancy by 50%. 208V 3 Phase Power . Most Power Panels don’t have a documented load schedule. These are technically more accurate because they refer to the neutral. A forum community dedicated to professional electricians, contractors, and apprentices for residential and commercial work. Motors are rated for 10% over or under the nameplate voltage listed on the motor. Where does this 208v come from? For example, for a 208/120 volt service, the line voltage is 208 Volts, and the phase voltage is 120 Volts. This motor would allow the minimum voltage to be 180 volts. 208V 3 Phase power also goes by the names 208V 3 Phase 4 Wire and 208Y/120V. 208V 3 Phase power also goes by the names 208V 3 Phase 4 Wire and 208Y/120V. Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy. The peak voltage is 120 volts multiplied by 1.414. 3 Phase electric motors have 3 legs (phases) evenly spaced in a circle around the center (shaft) and they move in a circle around the center (shaft) like legs on a bike. root of 3; 1.414 is the sq. Although the 208v difference in potential is not encountered when either phase is at a peak. Power oscillates constantly between 0v and 120v. For a better experience, please enable JavaScript in your browser before proceeding. Single Phase 120V – 1 Pole Circuit Breaker, Single Phase 208V – 2 Pole Circuit Breaker, Panel Directory (208 3 Phase 42 Circuit) explanation, The (3) vertical lines are the three power phases (Phase A, Phase B, Phase C), The (21) horizontal lines are the power phase connections to the (42) circuit breaker positions, The (18) dots are the (3) power phase to (42) circuit breaker position connections, The (42) numbers are the (42) circuit breaker positions, Connect (1) 120V 1 Phase power wire to the 1 Pole CB, Connect (1) Neutral wire to the Neutral Bar, Connect (2) 208V 1 Phase power wires to the 2 Pole CB, Connect (3) 208V 3 Phase power wires to the 3 Pole CB. root of 2. Our training was pretty good but I want to learn more about electricity. Normalized waveforms of the instantaneous voltages in a three-phase system in one cycle with time increasing to the right. http://www.electricalknowledge.com/forum/forum.asp?FORUM_ID=11, http://www.windstuffnow.com/main/3_phase_basics.htm, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. If I understand things correctly 120/208v implies the. How does 120v lines add up to make 208v? Military Diesel Generator Filters and Gaskets, Ambac M-50 Fuel Injection Pump: 50-2/4A-80A-9540A Manuals, AMMPS (Advanced Medium Mobile Power Sources) Manuals, Press Releases, Brochures, MEP016B – MEP701A – MEP016E – MEP021B – MEP026B Manuals, MEP804A – MEP804B – MEP814A – MEP814B Manuals, GMG Refurbishment Program for Military Diesel Generators, GMG Is Pleased To Announce Our New Ambac M50 Pump Exchange Program, 1, 2, 7, 8, 13, 14, 19, 20, 25, 26, 31, 32, 37, 38, 3, 4, 9, 10, 15, 16, 21, 22, 27, 28, 33, 34, 39, 40, 5, 6, 11, 12, 17, 18, 23, 24, 29, 30, 35, 36, 41, 42. Note that the 230 volt will have a wild leg (230 volts to neutral) on that particular leg. this message was sent from a dental floss farm using ZappaTalk and a pair of zirconium encrusted tweasers. I understand the fact that in a single phase unit the power falls to zero three times during each cycle. Hi everyone Thanks in advance for your help If I understand things correctly 120/208v implies the Line voltage (voltage measured between any two line conductors) is 208 volt and the phase voltage (voltage measured between a line an the neutral) is 120 volt. 208V 3 Phase power has 3 electrical legs (phases) evenly spaced in a circle (360 degrees / 3 phases = 120 degrees) around a center (neutral). 208V Single Phase and 208V 3 Phase power are easy to use, but hard to understand. Running motors at a lower voltage will decrease the life expectancy by 50%. I came across those values a few times but where do they come from? Below is a representation of the difference between 208/230 volt wiring. Very well said, explainations like that is why I joined this forum! The peak voltage is not 120 volts. I'm surprised at the number of licensed guys that don't understand 3 phase systems.. Hi just briefly ac voltages are vector quantities , their calculations include both magnitude and direction. When a motor is rated at 208/230 volts this means the motor will operate at the 208 volt rating, not 10% under the 208 volt rating. So, a 230 volt motor can operate as low as 207 volts. Three-phase 208-volt electric motors are less expensive and more efficient than 220-volt single-phase motors. Are they any books out there that you would recommend? Ideally, the power circuit loads should be balanced across all three Power phases (Phase A, Phase B, Phase C). The phase order is 1‑2‑3. That must some how relate to the graph. Each leg (pedal) provides power (pedal pressure) at a unique angle (pedal angle) to the center (shaft). Note that the 230 volt will have a wild leg (230 volts to neutral) on that particular leg. The” Y” in 208Y/120V refers to the neutral as the center of the Y shaped power source. Electrical phases are commonly called legs. For this reason, three-phase motors are common on industrial and restaurant equipment, while similar equipment can be difficult if not impossible to find with a single-phase motor.

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