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Old 10-02-2012, 06:32 PM
Steve Atkinson Steve Atkinson is offline
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Join Date: Jun 2011
Location: NorCalif
Posts: 93
I have seen it work reliably without, but you are correct it may be needed.

Testing at my house here in the country, 2200sq ft, 2-phase panel, about 160ft to transformer on the pole, no need for phase coupler. In the city with typical street grids of houses, no need. But I just finished helping with a large country home that had a main panel and 3 sub-panels. Needless to say phase couplers were definitely required.

Anyone considering making SAI a regular part of your work, PM me and we can cover specifics.
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