My bad - I apologize about stating that the ZW-L has a three prong plug - did so without checking. But the two prong plug with on large spade sets a factory polarization as does my mis-stated three prong plug - so my advice still stands, use an extension cord (an extension cord that has three prong plug or two prong with one large spade) to guarantee the two ZW-Ls are plugged into the same phase of 110v power.
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