Hy,
I am involved in a project which requires plan approval for electric diagrams. I am using cascade low voltage distribution which contains Merlin Gerin NS250N, C60N-C40 and C60N-C10.
I am received the following comment: "outstanding point selectivity c32- c10 selectivity is till 240A.
and for c40 - c10 selectivity is till 300A
so if generator capability is bigger than their is no selectivity".
After that I have checked the tripping curves for the breakers and everything was ok. The following remark was: "you maybe correct on that subject but I don't think that what we are discussing is visible in this diagram.Often it is seen as a horizontal line at the lowest part of the drawings and in this case not drawn. For that you should also use the book and checking the I2t diagrams. We don't know how good the diagrams are but we know that the books are correct and this is confirmed by Merlin gerin. So please don't solely rely on this software."
Now I don't understand anything. What I2t diagrama are? I didn't find any info about Compact NS i2t diagrams. Any clue? Thanks
I am involved in a project which requires plan approval for electric diagrams. I am using cascade low voltage distribution which contains Merlin Gerin NS250N, C60N-C40 and C60N-C10.
I am received the following comment: "outstanding point selectivity c32- c10 selectivity is till 240A.
and for c40 - c10 selectivity is till 300A
so if generator capability is bigger than their is no selectivity".
After that I have checked the tripping curves for the breakers and everything was ok. The following remark was: "you maybe correct on that subject but I don't think that what we are discussing is visible in this diagram.Often it is seen as a horizontal line at the lowest part of the drawings and in this case not drawn. For that you should also use the book and checking the I2t diagrams. We don't know how good the diagrams are but we know that the books are correct and this is confirmed by Merlin gerin. So please don't solely rely on this software."
Now I don't understand anything. What I2t diagrama are? I didn't find any info about Compact NS i2t diagrams. Any clue? Thanks