120/208V Single Phase Issue

[rogo]

Running MEP 2012

VERY long story short, I am attempting to feed a 120/208V single phase load center panel from a 120/208V three phase distribution panel. I can make the circuit, and the load will transfer, but the breaker is only 1 pole. I've messed with the families, circuits, everything... but Revit will not give me the 2 pole breaker. I believe the problem lies in the distribution system. A 120/208 single phase system has both the A and B busses, just like your residential load center at home. However, Revit takes the term 'single phase' too literally and will not show the connection to the feeder panel as 2 pole no matter what I do. I'm nearing rage status and was hoping one of the kind souls here at AUGI can help me out.

And no, I can't simply change the 120/208V single phase panels to 3 phase. These are the cards I have been dealt....

[CADastrophe]

Open the Family for the single phase panel. Select the electrical connector and make sure that Number of Poles is set to 2.

[rogo]

Thank you for the speedy reply. I have tried that, but now it wont let me connect to the 120/208 3 phase panel. After making this change, when I select the single phase panel, it still shows the 120/208 single distribution system in the properties browser, but at the top of the screen just under the command bar, the distribution system selector is now blank. And when I attempt to make a power system, I can't select any panels.

[CADastrophe]

The Panel's voltage must be set to 208V.

[mhartmann]

set the voltage/phase on the connector in the load center to 208/2 pole, and the connector in the meter center or distribution panel to 208/3 poles. make sure you have defined voltage system 120/208 as 3 phase, 4 wire. then make sure both are set to distribution system 120/208. create a circuit from the load center and it should let you connect it to the dist panel as a 2 pole breaker.
hth
mike

[rogo]

There it is, thanks guys. At first I was avoiding changing the load center to 208 2 pole because it messed up all the receptacle circuits I had already sent to the load center, but a few minutes of reconnecting has remedied that.

Thanks again for your help.

[CFOOTE44]

WELL, IT SEEMS TO HAVE BEEN A WHILE SINCE YOU FOLKS HAD THIS CONVERSATION. I'M NEW TO REVIT MEP, AND IM HAVING A VERY SIMILAR ISSUE. HOWEVER, I CANNOT FIND THE "LOAD CANTER" OR "METER CENTER" SELECTIONS TO CHANGE, AS OUTLINED ABOVE.

IF THIS HAS CHANGED FROM 2011/2012, CAN SOMEONE POSSIBLY UPLOAD A SCREENSHOT OF THE DIALOG BOX WHERE I MIGHT MAKE THIS WORK?

[BenSammis]

You need to edit the family and adjust the settings of the electrical connector.

[Tasherrill09]

I'm still having problems. I changed the connector to 208v 2 pole but when I hook something up that a 2 pole. The 2nd leg doesn't show any load in it. What am I still doing wrong?

[mhartmann]

make sure the connector in the family is set to Power - Balanced load, not Unbalanced. that way it will divide the load of the device over the number of phases equally
hth,
mike