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-   -   one side of double pole 100 amp breaker (http://www.diychatroom.com/f18/one-side-double-pole-100-amp-breaker-166395/)

ndmick 12-13-2012 06:19 PM

one side of double pole 100 amp breaker
 
Can just 1 side of a 100 amp double pole Circuit Breaker go bad?

jlmran 12-13-2012 06:22 PM

My guess is yes.

k_buz 12-13-2012 06:24 PM

For sure

ndmick 12-13-2012 06:28 PM

Thanks .I feed a subpanel thru a 100 amp breaker and 1 side of the sub is not working(not getting full amps) even with none of the curcuits in the panel on, keeps popping 1 side of breaker.

jlmran 12-13-2012 06:38 PM

It's impossible for only one side of a 2 pole to "trip". Please describe further.

ndmick 12-13-2012 06:42 PM

It doesn`t completely trip but it doesn`t let full voltage thru the 1 side (1 feed to the sub panel )some voltage but not all.Seems like 1 side doesn`t catch when resetting it

jlmran 12-13-2012 06:45 PM

How/where are you measuring voltage? At the suspect breaker? At the subpanel? What is your reference?

Seems odd to me that a breaker is responsible for a "reduced voltage".

mpoulton 12-13-2012 06:48 PM

It's not really possible for a breaker to "not let full voltage through". It's either on or off. Could be a bit loose, but that would only be apparent under heavy load and would cause major heating. You need to do some measurements and describe in detail exactly what your observations are.

gregzoll 12-13-2012 06:49 PM

Yes it can.

ndmick 12-13-2012 06:50 PM

measuring at the subpanel where it goes into the main breaker.

jlmran 12-13-2012 06:53 PM

Quote:

Originally Posted by gregzoll
Yes it can.

How can this be explained in the context of Mr. Ohm?

jlmran 12-13-2012 06:55 PM

Quote:

Originally Posted by ndmick
measuring at the subpanel where it goes into the main breaker.

What are your contact locations? Line to line? Line to neutral? Line to ground? What is the value of the reduced voltage?

ndmick 12-13-2012 06:59 PM

line to neutral

ndmick 12-13-2012 07:00 PM

Thanks to all that helped I`ll go pick up new cuircuit breaker in the morning .I`ll come back on friday night let you all know the results.

gregzoll 12-13-2012 07:49 PM

Quote:

Originally Posted by jlmran (Post 1072586)
How can this be explained in the context of Mr. Ohm?

Nothing to do with Ohm's law. Breakers go bad, whether they are a Single pole or double pole. Just because you have two poles on a breaker, one pole can go bad, while the other still works fine.

Even more fun, when you have a 400amp breaker blow, causing the other phase to blow out that side. Nice fourth of July action.


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