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-   -   Middle of the run double duplex (http://www.diychatroom.com/f18/middle-run-double-duplex-152498/)

Metallo 08-03-2012 09:17 PM

Middle of the run double duplex
 
Hi,

I have a middle of the run duplex receptacle that I have transformed in a double duplex.

Black to brass, white to silver and I two jumps to add the second duplex. Of course, I have the bare ground on both green screws connected to the double gang.

Measuring:

If I measure with an analog multi meter tester, I get 120V on all 4 sockets.
If I measure with a non touch voltage tester, I get sound in the black, but also in the neutral (if the bare is disconnected), if the bare is connected the neutral does no longer sound.

On the same circuit I have a duplex receptacle, I did the same experiment, with or without bare ground connected, the neutral does not sound (which looks more normal to me).

What am I missing??

Thanks guys

Alex

Missouri Bound 08-03-2012 09:39 PM

Quote:

Originally Posted by Metallo (Post 980904)
Hi,



What am I missing??

Nothing. You expect too much from a non-contact tester. Proximity is everything with non-contact testers. Run that tester through your hair and it will register voltage.:laughing:

MisterZ 08-03-2012 09:51 PM

those no-contact testers are unreliable.
with the outlet wired together, Black probe on ground and Red probe on Brass screw (or small outlet slot if assembled)
the volt meter should get between 115v-120v depending on your service.
Now with the Black probe on ground and Red probe on Silver screw (or wide slot on outlet) the reading should be minimal.
if you get 120v on the neutral, something is wrong.
DO NOT rely on the no-contact probes;)

or get a $3 polarity tester like this...
http://i9.ebayimg.com/04/i/001/38/d7/3c7f_35.JPG

Metallo 08-03-2012 10:23 PM

Quote:

Originally Posted by MisterZ (Post 980936)
those no-contact testers are unreliable.
with the outlet wired together, Black probe on ground and Red probe on Brass screw (or small outlet slot if assembled)
the volt meter should get between 115v-120v depending on your service.
Now with the Black probe on ground and Red probe on Silver screw (or wide slot on outlet) the reading should be minimal.
if you get 120v on the neutral, something is wrong.
DO NOT rely on the no-contact probes;)

or get a $3 polarity tester like this...
http://i9.ebayimg.com/04/i/001/38/d7/3c7f_35.JPG

First reading gives me 120V
Second reading gives me no voltage

Consider that my multi tester is analog.

Hope this is good.

Thanks!
Alex

MisterZ 08-04-2012 12:17 AM

i think you're OK here;)


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