texassparky
Member
- Location
- Dallas / Ft. Worth
Just wondering if some one can enlighten me to some pros and cons that I might not be thinking of regarding an engineers reasoning for the following design. Our on staff engineer prides himself on being overly technical in his answers when explaining his designs, so before I go discuss it with him thought maybe someone here could shed a little light on it so I will know what he is talking about when I do go talk to him.
In a health care facility - design is to use new Square D 84 ckt panels. From a design stand point it saved a lot of wall space in the electrical rooms, from an install view I now have to get conduits into what used to be 40" of panel space now into 20" of panel space.
Second - spec is no more than 6 C.C.C. / per homerun so he did me no favors in being able to combine circuits in a homerun to get them into fewer conduits increasing the problem with the use of the 84 ckt panels.
Third - the design is for use of MWBC, using a shared neutral and use 3 pole breakers. from a design point this saved a ton of white and grey wire. However in a hospital - where turning off a single circuit takes a near act of congress, now you will have to turn off 3 circuits, just doesn't seem like a good design for this type of facility to me.
Last, and maybe this should be a separate thread but, original design was for use of 15kva transformers, after completion of the coordination study, these were all changed to 30 kva ( no change in load). So I assume this has to do with fault current but what does a 30 do or have that a 15 doesn't with regard to fault current ?
any opinions are welcome please...
In a health care facility - design is to use new Square D 84 ckt panels. From a design stand point it saved a lot of wall space in the electrical rooms, from an install view I now have to get conduits into what used to be 40" of panel space now into 20" of panel space.
Second - spec is no more than 6 C.C.C. / per homerun so he did me no favors in being able to combine circuits in a homerun to get them into fewer conduits increasing the problem with the use of the 84 ckt panels.
Third - the design is for use of MWBC, using a shared neutral and use 3 pole breakers. from a design point this saved a ton of white and grey wire. However in a hospital - where turning off a single circuit takes a near act of congress, now you will have to turn off 3 circuits, just doesn't seem like a good design for this type of facility to me.
Last, and maybe this should be a separate thread but, original design was for use of 15kva transformers, after completion of the coordination study, these were all changed to 30 kva ( no change in load). So I assume this has to do with fault current but what does a 30 do or have that a 15 doesn't with regard to fault current ?
any opinions are welcome please...