Am i reading this correctly?
Am i reading this correctly?
Are all circuits sharing a neutral supposed to have a common trip breaker?
No, they do not have to have a common trip, they do have to have a means to open all the legs or phases simultaneously, this could be handle ties.
Roger
Yes, a common trip will open all ungrounded conductors. The responses were to let you know that it can also be handle ties on single pole breakers which are not common trip.Isn't that what common trip actually means? I know some refer to common trip strictly in regards to the multipole breakers. Not sure who's right but to me common trip would mean something that trips all items in COMMON?
Isn't that what common trip actually means? I know some refer to common trip strictly in regards to the multipole breakers. Not sure who's right but to me common trip would mean something that trips all items in COMMON?
No, opening all poles manually and common trip are different operations and the latter is not required. Many people think the article requires a breaker that is common trip but it is not the case. Using handle ties might trip more than one pole but it may also not trip more than one pole and it would still be legal.
Roger
I have an existing panelboard that we are now required to be in compliant with 210.4b. The supplier is telling me that they don't make handle ties for 3 individual 1P20A breakers. Is this true?
If this is true and you have a junction box with 3 circuits (sharing the same neutral) homerunning back to the panel, how can we meet 210.4b then?
I know that Ge makes them and I am sure other manufacturers make them. Tell the supply guys to double check.
Square D does have them for three QO breakers (look on page 3) and it is a much better design than the ones they sell for two breakers.Tonight I heard that SD does not make them.
Square D does have them for three QO breakers (look on page 3) and it is a much better design than the ones they sell for two breakers.
Square D does have them for three QO breakers (look on page 3) and it is a much better design than the ones they sell for two breakers.
Trying to understand 210.4(B). Does the QO1HT independent trip meet this requirement?
Mike, the QO1HT handle tie (which creates an independent trip 2-pole c/b) would meet the requirements of 210.4(B).
Or the QO3HT handle tie could be used for an independent trip 3-pole c/b, also meeting the requirements of 210.4(B).
But it say simultaneously. Does the independent trip do this?
210.4(B) says "Disconnecting means" not "overcurrent protection."