3 phase to single phase

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U-tube-bender

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I'm combining 2- 100amp panels into 1 -200amp and moving it 20' futher into the building. They're both single phase, but there is also a 3phase disconnect for A/C that needs to get moved in. I know I have to install at least a 200 amp disconnect on the exterior now because I'm moving further into the building. Would I use a 3phase disconnect or just a single phase with a separate disconnect for the A/C and only use the third leg to feed the A/C disconnect? Any suggestions?:-?
 
U-tube-bender said:
I'm combining 2- 100amp panels into 1 -200amp and moving it 20' futher into the building. They're both single phase, but there is also a 3phase disconnect for A/C that needs to get moved in. I know I have to install at least a 200 amp disconnect on the exterior now because I'm moving further into the building. Would I use a 3phase disconnect or just a single phase with a separate disconnect for the A/C and only use the third leg to feed the A/C disconnect? Any suggestions?:-?
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What feeds the 3 phase disco? :confused: Something does not sound right here.
 
Right now there's a trough on the inside with no disconnect at all between the meter and the trough. Then they tapped off the feeders to feed the 2 single phase panels and the 3phase disco
 
U-tube-bender said:
Right now there's a trough on the inside with no disconnect at all between the meter and the trough. Then they tapped off the feeders to feed the 2 single phase panels and the 3phase disco
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So if you are leaving the 3 phase disco where it is and are just moving the 2 single phase panels into one panel then you just need a single phase disco.

I am assuming the 3 phase disco has overcurrent protection so if that is so you don't need to worry about it.
 
sounds like it's all on one set of service conductors and 230.72 would require them to be grouped.
If I understand what you are doing, I'd be more concerned about 230.70(A)(1). If I read correctly and those are service disconnects, in this area you would not be able to add 20 ft of interior servce conductors.
 
augie47 said:
sounds like it's all on one set of service conductors and 230.72 would require them to be grouped.
If I understand what you are doing, I'd be more concerned about 230.70(A)(1). If I read correctly and those are service disconnects, in this area you would not be able to add 20 ft of interior servce conductors.
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I understand the OP as saying he knows he has to add a disco when he moves the two 100 amp panels and makes them one. What I see is 2 panels single phases and a 3phase disco for the a/c grouped as the service. The two panels are being moved and combined thus the need to add a single disco at the service.

Is this correct U-tube?
 
U are correct Dennis, I missed "adding the 200 amp disconnect on the exterior"..sorry..old people can't read...
230.72 would still be applicable, however, all service disconnects woud have to be grouped.
 
Not old just "senior". And your right, they would have to be grouped. So would I have the power coming out of the meter into a trough and then feed a single phase 200, and a 3 phase 60 out of the trough, all on the outside? And is it OK to have that much load on the first 2 legs of the service and only 1 thing on the third leg?
 
U-tube-bender said:
Not old just "senior". And your right, they would have to be grouped. So would I have the power coming out of the meter into a trough and then feed a single phase 200, and a 3 phase 60 out of the trough, all on the outside? And is it OK to have that much load on the first 2 legs of the service and only 1 thing on the third leg?
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As long as your loads are calculated and they are not overloaded then it doesn't matter.

I assume cost is why there are just single phase panels...
 
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