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07-11-2009, 06:59 PM   #1
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## What does x and y mean?

Does x mean 120v hot and y mean 240v hot? This is what I'm guessing, but just want to check to make sure. I'm going to be installing a dryer plug and I know where ground and neutral go as they are marked, and ground is quite obvious just by the shape alone, but the other two line terminals are just labeled x and y.

07-11-2009, 07:03 PM   #2
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Quote:
 Originally Posted by Red Squirrel Does x mean 120v hot and y mean 240v hot? This is what I'm guessing, but just want to check to make sure. I'm going to be installing a dryer plug and I know where ground and neutral go as they are marked, and ground is quite obvious just by the shape alone, but the other two line terminals are just labeled x and y.
That's just the marking indicating a "phase" wire. In other words, one hot wire in X, and the other hot wire in Y. If it was three phase it would be X, Y, and Z. It doesn't matter which hot goes to what terminal on that dryer receptacle.

 07-11-2009, 07:08 PM #3 Member   Join Date: Jan 2009 Location: South of Boston, MA Posts: 17,248 Rewards Points: 2,000

07-11-2009, 07:16 PM   #4
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Quote:
 Originally Posted by InPhase277 That's just the marking indicating a "phase" wire. In other words, one hot wire in X, and the other hot wire in Y. If it was three phase it would be X, Y, and Z. It doesn't matter which hot goes to what terminal on that dryer receptacle.
I was wondering if I could put either or, but then figured there must be a right way. Guess it does not really matter as they're both hot anyway, and from each end it's 240 volt anyway, and from one of the ends to top (neutral) is 120 right? So basically same as oven.

07-11-2009, 07:54 PM   #5
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Quote:
 Originally Posted by Red Squirrel I was wondering if I could put either or, but then figured there must be a right way. Guess it does not really matter as they're both hot anyway, and from each end it's 240 volt anyway, and from one of the ends to top (neutral) is 120 right? So basically same as oven.
Yes. Single phase equipment doesn't know, and doesn't care which wire is which.

07-11-2009, 07:54 PM   #6
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Quote:
 Originally Posted by Scuba_Dave
5 cm. But I'm glad you found it.

07-11-2009, 08:26 PM   #7
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Good answer. I guess that explains the F you got in geometry class.

Quote:
 Originally Posted by Scuba_Dave
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07-11-2009, 08:47 PM   #8

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Quote:
 Originally Posted by InPhase277 5 cm. But I'm glad you found it.
OK, but what's that called?
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07-11-2009, 08:58 PM   #9
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Quote:
 Originally Posted by Speedy Petey OK, but what's that called?
A line.

Actually think there's a term for it, I forget. Think it's like hypotenuse or something like that.

Math is not my thing.

 07-11-2009, 09:38 PM #10 Electrical Contractor     Join Date: Sep 2008 Location: Delmarva Posts: 3,368 Rewards Points: 2,000 Go back and watch the "Wizard of Oz" movie, and catch the scene right after the scarecrow obtains his brain. His response is to try to recite the pythagorean theorem..... albeit incorrectly .... __________________ -KB Life is uncertain -- eat dessert first!!
07-11-2009, 09:48 PM   #11
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Quote:
 Originally Posted by Red Squirrel Does x mean 120v hot and y mean 240v hot? This is what I'm guessing, but just want to check to make sure. I'm going to be installing a dryer plug and I know where ground and neutral go as they are marked, and ground is quite obvious just by the shape alone, but the other two line terminals are just labeled x and y.
When installing a NEMA 14-30 device, such as your dryer receptacle, the terminals should be marked W X Y and G.

If you were installing a NEMA 15-30 device, which does not have a neutral, the terminals would be marked X Y Z and G.

In each case, the X Y or Z terminals designate "hot" lines. The use of W indicates a white or neutral connection, and G always is for the grounding connection.
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 07-11-2009, 09:49 PM #12 Licensed Electrical Cont.     Join Date: Feb 2004 Location: NY State Posts: 7,821 Rewards Points: 1,992 That's it. Bonus points for the W of Oz reference. __________________ Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
07-11-2009, 10:02 PM   #13
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Quote:
 Originally Posted by Speedy Petey That's it. Bonus points for the W of Oz reference.
That's how we all knew that the Wizard was a fraud. And as Professor Marvel, he was luring little girls into his trailer for "fortune telling. Hmmm...

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07-12-2009, 04:59 PM   #15
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It's imperative that the two hot wires be connected to the proper x and y terminal. If they are connected incorrectly, the dryer will work in reverse and blow cold air instead of hot. If you find your clothes frozen stiff as a board reverse the two wires. That is why virtually all freezers and refrigerators are 115 volts. Only one way to wire them up. Otherwise half the people would wire them backwards and cook the stored food rather than preserve it. No need to thank me for providing this information. I've learned so much from others here on this forum I'm just happy to be able to return the favor.

Last edited by Mike in Arkansas; 07-12-2009 at 05:02 PM.

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