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Old 03-08-2013, 12:39 PM   #1
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Measuring 240v, 4 wire curcuit?


Can I measure 240v on my meter? I can only get 120v, however, I do get 120 from each hot wire. I'm thinking this is right?

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Old 03-08-2013, 12:44 PM   #2
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Measuring 240v, 4 wire curcuit?


If you are measuring 120 from each hot to ground or neutral, but not 240 across the 2 hots, you have a problem.

The circuit is wired wrong or one leg is open and you are measing one side back thru the load.

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Old 03-08-2013, 12:49 PM   #3
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Measuring 240v, 4 wire curcuit?


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Originally Posted by rjniles
If you are measuring 120 from each hot to ground or neutral, but not 240 across the 2 hots, you have a problem.

The circuit is wired wrong or one leg is open and you are measing one side back thru the load.
I'm getting 120v from black to ground/neural and 120v from red to ground/neutral

I have not measured between black and red. I didn't think you could measure 2 hots together

Last edited by jclee; 03-08-2013 at 12:56 PM.
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Old 03-08-2013, 12:59 PM   #4
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Measuring 240v, 4 wire curcuit?


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Originally Posted by jclee View Post
I have not measured between black and red. I didn't think you could measure 2 hots together
THAT is your 240V.
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Old 03-08-2013, 04:15 PM   #5
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Measuring 240v, 4 wire curcuit?


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Originally Posted by jclee View Post
I'm getting 120v from black to ground/neural and 120v from red to ground/neutral

I have not measured between black and red. I didn't think you could measure 2 hots together
As Speedy says, that is the only way you will measure 240.
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Old 03-08-2013, 04:17 PM   #6
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Measuring 240v, 4 wire curcuit?


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Originally Posted by jclee View Post
I'm getting 120v from black to ground/neural and 120v from red to ground/neutral

I have not measured between black and red. I didn't think you could measure 2 hots together
If both phases originate from the one hot line,
then you will measure nothing or close to it !

But if they come from different hot lines,
then you will measure 220 - 240v.

So yes you can measure across two hot lines !
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