MCC Vertical Bus Split

[JoBish]

I recently received copies of a clients single line drawings of several MCCs which show as many as 3 vertical bus splits dispersed throughout the arrangements. I have never encountered this before and cannot think of any practical reason this should be done. In some cases, there are "vendor-installed" jumpers connection both sides of the split to the main horizontal bus. In other cases, there are no jumpers, leaving large portions of the MCC with no apparent connection to the vertical bus and thus without power.

I'm wondering if anyone else has ever seen this, i.e. splits in the vertical bus, and what would be the reason for it?

 

[jraef]

The entire concept of splitting a vertical bus makes zero sense to me. The only time I have ever seen something like this is where there is something in the MCC lineup that is powered from a different source, but for some reason the designer wanted it grouped in the same physical location, but in those cases the sections just did not have vertical bus installed in those areas. Another possibility is that if you have units in a section that require more depth than there is in front of the vertical bus, but you can't just locate them at the bottom like everyone else does, In that case, if you WAQNTED to then use spaces below that, I suppose you would have to jumper around the gap. But like I said, what most people do is to just locate deep units in the bottom, and remove the vertical bus in those spaces.


"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington

 

[JoBish]

I failed to mention that the arrangements are all single ended, according to the single lines. There also isn't any indication of any differentials in the size of the units, so the special cases you mentioned don't seem to apply here.

Thanks for the feedback JRAEF.