1200 amp 3 phase service Tap rule?

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ELECTRICAL SYSTEM'S

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Installing a 1200 amp 3 phase 120/208 volt fused disconnect.
We have 4 sets of parallel feeders to disconnect.
From disconnect we are looking at 2 options for distribution
T-tapping for 3-400 panelboards with main BRK.
OR
6 - 200 amp panelboards with main BRK.

My question is how to T-tap the parallel 1200 amp feeders to each panel?
 
The best solution would be a small section of 1200 amp bus with the proper number of lugs. Otherwise you would need some type of Polaris connector that can accommodate the 4 sets of parallel feeders and the taps.
 
ELECTRICAL SYSTEM'S said:
Installing a 1200 amp 3 phase 120/208 volt fused disconnect.
We have 4 sets of parallel feeders to disconnect.
From disconnect we are looking at 2 options for distribution
T-tapping for 3-400 panelboards with main BRK.
OR
6 - 200 amp panelboards with main BRK.

My question is how to T-tap the parallel 1200 amp feeders to each panel?
Click to expand...

I'm not sure I would design this way, but if you want to do this use Polaris connectors. I think you can get them with as many as 12 ports.
 
Also, not sure if you can change course at this point, but it probably would have been much more cost effective to use a 1200 MLO panelboard with2-6 breakers instead of the 1200 switch, taps and MB subs.
 
:thumbsup:
electrofelon said:
Also, not sure if you can change course at this point, but it probably would have been much more cost effective to use a 1200 MLO panelboard with2-6 breakers instead of the 1200 switch, taps and MB subs.
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Or if extra capacity is already factored into the 1200 amps - even a 1200 amp main breaker panel so you don't have to somehow add a main if you someday end up with more then 6 feeders from that panel.

I was redoing service in a school and used a 1200 amp fused disconnect and a 1200 amp main lugs I line panel - but only because it was easier to do it that way the way existing things lay out. Old gear had sufficient raceway supplying it already from POCO transformer but existing feeders were already on other end of existing gear. Was simplest to not tear out concrete and excavate dirt inside an already finished building just to get the service raceways a few feet further to the left.

Had it been totally new application I would have rather just gone with I line panel with 1200 amp main breaker in it.
 
kwired said:
:thumbsup:

Or if extra capacity is already factored into the 1200 amps - even a 1200 amp main breaker panel so you don't have to somehow add a main if you someday end up with more then 6 feeders from that panel.

I was redoing service in a school and used a 1200 amp fused disconnect and a 1200 amp main lugs I line panel - but only because it was easier to do it that way the way existing things lay out. Old gear had sufficient raceway supplying it already from POCO transformer but existing feeders were already on other end of existing gear. Was simplest to not tear out concrete and excavate dirt inside an already finished building just to get the service raceways a few feet further to the left.

Had it been totally new application I would have rather just gone with I line panel with 1200 amp main breaker in it.
Click to expand...

Yeah from a cost standpoint , MLO with 2-6 usually wins, but there is the potential to screw someone down the road when they need a 7th. Another reason to have a main is it certainly simplifies adding breakers later. I am personally ok with adding an I line breaker hot even on a 480 system, but other types that require bolt on, no way.
 
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