Your Resident Electrician for all your electrical questions!

Discussion in 'Do It Yourself (DIY)' started by Young Frankenstein, May 12, 2012.

  1. gus6464

    gus6464 Well-Known Member

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    I have a 240V 30A dryer outlet in my garage that I am not using as our dryer is gas. I wanted to covert the plug to a 20A 240V. The plug is the older type NEMA 10-30 240/120 combo which has no ground but 2 hots and neutral. Is converting as simple as pulling the 30A breaker and getting a double pole 20A, connect the two hots but then take neutral and move it to ground? Want to replace with a NEMA 6-20.
     
  2. Awesome Dennis

    Awesome Dennis Active Member

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    *** just reread your post and Misunderstood what you were trying to do.
    And yes you could do what your asking. That would give you 20A 240v.
     
    Last edited: Oct 13, 2016
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  3. gus6464

    gus6464 Well-Known Member

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    So what do I do to make it 240v? Isn't 240V on a nema 6-20 just 2 hots on the breaker and a ground?
     
  4. Awesome Dennis

    Awesome Dennis Active Member

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    I edited my original post. My only question to ask is the panel your changing the breaker in does it have the main breaker inside it?
     
  5. gus6464

    gus6464 Well-Known Member

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    Yeah it's the main house panel.
     
  6. Ramasule

    Ramasule Well-Known Member

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    You would replace the breaker.
    If your wire has a ground you would use that and tape the neutral.
    If your wire does not have a ground you would move the neutral to the ground bar in your panel, and wrap some green tape on it.
    At the other end where your receptacle is you would do the same, tap the neutral green (Just one wrap is fine), and wire as you indicated.

    This is out of my area of expertise though.
     
  7. Paul B

    Paul B Well-Known Member R2R Supporter Article Contributor

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    Yes. It's called 220 but you can call it 240 if you like.
     
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  8. Ramasule

    Ramasule Well-Known Member

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    How dare you assume what tap my primary is using!
     
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  9. Paul B

    Paul B Well-Known Member R2R Supporter Article Contributor

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    Unless you are in Tibet, Istambul, Ocho Rio's or the Moon, you are using 220. It's actually closer to 208 or so but it is called 220 in the US. :D
    Or maybe I assumed wrong :eek:
     
    Last edited: Oct 14, 2016
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  10. Ramasule

    Ramasule Well-Known Member

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    Youve been 3 phasing to long Paul.

    Single phase windings should be 240 center tapped to give two 120 legs.

    Not the vector of two 120 volt legs from a wye.
     
  11. Floyd R Turbo

    Floyd R Turbo Turbo's Aquatics R2R Supporter Gold Sponsors Toys For Kids 2016 Article Contributor Partner Member

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    220, 221, whatever it takes
     
  12. Brew12

    Brew12 Electrical Gru R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    Hmm.. well.. if we didn't know before it is clear that PaulB has an industrial background!
     
  13. Paul B

    Paul B Well-Known Member R2R Supporter Article Contributor

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    Get a voltmeter and measure it. :eek:

    Very industrial. Everything now commercial is 277/480. It is really quite lower than that but what do I know? I am old and probably senile. :confused:
     
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  14. Brew12

    Brew12 Electrical Gru R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    You've probably forgotten more about many things most of us never learned. For instance, I would be shocked if you haven't used Scott T transformers or Zig Zag transformers.

    The latest trend in industrial is actually to make 277V go away in favor of restively grounded 480V systems. With the improvements in industrial LED lighting, the 208V systems are really making a comeback.
     
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  15. Paul B

    Paul B Well-Known Member R2R Supporter Article Contributor

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    I started as a construction electrician in 1972 in Manhattan. One of my first jobs was on the construction of the World Trade center. I also renovated the Plaza Hotel. Helped build the New York Playboy Club (where I would have worked for free) as well as being the general foreman on Penthouse Magazine (where I would have paid them to work) and we built many sky scrapers in New York City. All of them are 277/480 but we all know they are a lot less due to resistance.
    Our houses are said to be 120 or even 115 but they are probably less depending on how far we are from the transformer.
    But I have been retired for 9 years so now maybe we don't use those voltages any longer. As far as I know we now use chicken soup for electricity. :eek:
    Somewhere on this thread it was said the OP was using an air conditioning outlet. I doubt that is a 140 volt outlet, but as I said, I am old and retired and senile, so it could be. :p

    In the lower picture I am CAD welding in a New York City garbage incinerator. Not a place you want to go for your honeymoon as the maggots were up to your ankles. The top picture I am hanging off the roof of the Plaza hotel. I used those fixtures in my tank for years. That is snow covered Central Park below me,

    [​IMG]
     
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  16. Ramasule

    Ramasule Well-Known Member

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    Paul B must stand for Paul Bologna :p

    20161014_154254.jpg
     
  17. Paul B

    Paul B Well-Known Member R2R Supporter Article Contributor

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    Oh No, your house in Tibet is broken :eek:

    I wondered why they wanted me to retire. :cool:
     
    Last edited: Oct 14, 2016
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  18. Ramasule

    Ramasule Well-Known Member

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    :)
     
  19. Paul B

    Paul B Well-Known Member R2R Supporter Article Contributor

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    I am going to go and stick my head in mud now. I am senile. NNNNNNNNNNNNNNNNoooooooooooooooooo :eek:
     
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  20. Ramasule

    Ramasule Well-Known Member

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    The old Edison 3 wire finally did you in eh?

    Like my avatar?
     

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