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It's just your neutral for the supply voltage. It brought (presumably) 120v along with the black wire to L1 and L2. L1 is Line and L2 is neutral or white. Should be 120v. Is it? In that case the black and white go to the power terminals 1 and 2 as described on the label upper right. Polarity not an issue.
PROVISOS - THIS INFORMATION IS MEANT FOR INFORMATIONAL PURPOSES ONLY. I STRONGLY RECOMMEND THAT A LICENSED ELECTRICIAN PERFORM THIS WORK. I CAN NOT GUARANTEE THAT THE INFORMATION I HAVE GIVEN YOU IS ACCURATE FOR YOUR SPECIFIC APPLICATION, NOR DO I ACCEPT RESPONSIBILITY FOR FAILURE, CATASTROPHIC OR OTHERWISE.
Last edited by SLO-BOB; 01-18-2009 at 08:56 AM..
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