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-   -   Measuring 240v, 4 wire curcuit? (http://www.diychatroom.com/f18/measuring-240v-4-wire-curcuit-173920/)

 jclee 03-08-2013 12:39 PM

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?

 rjniles 03-08-2013 12:44 PM

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.

 jclee 03-08-2013 12:49 PM

Quote:
 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

 Speedy Petey 03-08-2013 12:59 PM

Quote:
 Originally Posted by jclee (Post 1132523) I have not measured between black and red. I didn't think you could measure 2 hots together
THAT is your 240V.

 rjniles 03-08-2013 04:15 PM

Quote:
 Originally Posted by jclee (Post 1132523) 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.

 dmxtothemax 03-08-2013 04:17 PM

Quote:
 Originally Posted by jclee (Post 1132523) 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 !
Be very carefull, the mother of all bites awaits the unwary !
Death shortly after.
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