On Fri, 1 May 2009 12:11:40 -0400, Rich Greenberg <[email protected]> wrot e:
>Check the power needed in Kilowatts for 3ph vs 1ph. And check with the >power company if a 3ph kwh (killowatt hour) costs the same or more or >less than a 1ph kwh. The Installation and Planning manual lists maximum system power consumption as 4.2kW without regard to whether it is 1 phase or 3 phase. In any case, cost per kwh is not relevant since the site is charging a flat fee for the installed circuit, not for the amount of power drawn through the circuit. There are 2 references I've found in the Installation and Planning manual that 3 phase uses only 2 of the phases and the 3rd phase provides redundancy against a fault in one of the other 2 phases. Three phase seems to be an extra layer of redundancy on top of the dual power feed redundancy. Is there anything more to it than that? Brian Nielsen
