How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Inactive Your Own Question

Inactive
Inactive, Master Electrician
Category: Electrical
Satisfied Customers: 4772
Experience:  Electrical Contractor
5968364
Type Your Electrical Question Here...
Inactive is online now
A new question is answered every 9 seconds

1. Is 220 vac 3 phase power service in the US rated as 208

Resolved Question:

1. Is "220 vac" 3 phase power service in the US rated as 208 vac or 220 vac or are there both (different) services? 2. Is 208 or 220 vac from phase to phase, or from phase to neutral (if provided) and is neutral (4th wire) provided? 3. Without a transformer I assume that 110 vac is not available from 220 3 phase service, unlike residential so called "2 phase" 110/220 service.
Submitted: 5 years ago.
Category: Electrical
Expert:  Inactive replied 5 years ago.
Thank you for asking your question on graphic
You are corresponding with Joseph - Your personal online "Electrical Consultant"


Im curious - is there a specific reason you need this information? Is there a specific application your preparing for? Can you give me more details?

  • If you need further clarification on anything I posted, Please dont hesitate to ask!
  • 100% Customer Satisfaction is my Goal!!
Customer: replied 5 years ago.
I want the info for my "background" knowledge. I write manuals for a company that manufacturs rainwater reclaim equipment with single or three phase pumps, and the engineers seem to be rather vague with their input to me. Also, some of our customers are starting to specify that they provide their own external pump controlled by our internal pump control relay. since there are our own on-board pumps--at least one- and only a single three phase power input the voltage for their external pump must be the same as our internal pump (a common 3 phase input terminal). I wondered if a 220 vac single phae on-board pump is compatabile with 3-phase external 220 vac pump. That's why I asked about the 220 vac being from phase to phase (which means it is compatabile, or if it is from phase to neutral.
Expert:  Inactive replied 5 years ago.
Thank you for asking your question on graphic
You are corresponding with Joseph - Your personal online "Electrical Consultant"


Three phase systems in the us work like this. "wye" systems are 120/208. Phase to ground 120v and phase to phase 208v. "Delta" systems are 120/240. Delta systems are dangerous for single phase systems because most people dont know about the high leg. So the voltage with this is 120v phase to ground on two of the phases, then 208v from one of the phases to ground. Each line phase to phase will be 240v.

For single phase services you have 120v phase to ground, and 220v phase to phase. But with single phase services you only have 2 hots.

Now three phase motors do not require a neutral. The only kind of motor that will require a neutral is a 120v motor.

  • If you need further clarification on anything I posted, Please dont hesitate to ask!
  • 100% Customer Satisfaction is my Goal!!
Inactive, Master Electrician
Category: Electrical
Satisfied Customers: 4772
Experience: Electrical Contractor
Inactive and 2 other Electrical Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
< Last | Next >
  • http://ww2.justanswer.com/uploads/mikepettinato/2009-9-4_41145_DSC005132.jpg Mike's Avatar

    Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
  • http://ww2.justanswer.com/uploads/WI/WireitUp/2012-6-17_18212_Photo00006.64x64.jpg Jason's Avatar

    Jason

    Service Technician

    Satisfied Customers:

    3278
    Over 15 years of experience in all types of installations, troubleshooting, and repairs.
  • http://ww2.justanswer.com/uploads/MI/MikeG2010/2012-6-7_192640_IMG01612.64x64.jpg Mike G.'s Avatar

    Mike G.

    Master Electrician

    Satisfied Customers:

    5318
    Proven Professional 45 years Experience
  • http://ww2.justanswer.com/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Master Electrician

    Satisfied Customers:

    2149
    Contractor-40 Years in the ElectricalTrade
  • http://ww2.justanswer.com/uploads/electrifier/2008-12-16_200429_headbob1.jpg electrifier's Avatar

    electrifier

    Master Electrician

    Satisfied Customers:

    1454
    Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Master Electrician

    Satisfied Customers:

    1115
    Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain
  • http://ww2.justanswer.com/uploads/UR/urelectrician/2012-9-28_223652_JustAnswerPic.64x64.jpg Kevin's Avatar

    Kevin

    Licensed Electrician

    Satisfied Customers:

    993
    27 years as a Licensed Electrical Contractor in Illinois, 5 year college Electrical Instructor, Former Electrical Inspector, Diploma in Digital Electronics, Former Illinois Licensed Home Inspector
 
 
 
Chat Now With An Electrician
Inactive
Inactive
Electrician
4772 Satisfied Customers
Electrical Contractor