The whopping # of conduits that Iwire posted would be a minimum for 1Ø system or line-line 3Ø loads only.

In the case of a 4W Y system, you'd have to tack on another third for the "hangers" that would have to be 2 wire circuits.
How does one limit the number of conductors in a raceway to 3 in the case of 3Ø - 4Wire services and feeders?

Is a 4 wire system inherently bad engineering and design as well? [Linked Image]


[This message has been edited by electure (edited 03-18-2005).]