Quad tap means there are 4 available .. um .. "tap" configurations (tri tap is another commonly used ballast, then double and single-tap). What this means is there are 4 ways to power the ballast: 120 VAC, 240VAC, 377V and um .. I think 480 is the last choice.
FWIW I believe it's 120v,208v,240v,277v. I wonder how they come up with 208 and 277 though.
04-09-2003, 09:14 PM
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