Yes, you could do that; but the common negative would have to be sized to handle the current for both lamps simultaneously. Generally, when you buy three-wire, all conductors are sized the same, so you'd want to oversize all three conductors (based on the amp draw and voltage drop for only one lamp).
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Jul 9, 2012, at 3:27 PM, Indigo wrote: > I am no electrician, but wouldn't a three wire enable you to run a common > ground and independent positives via separate switches and thus be able to > have either or both on ? > > There may well be times you need both steaming and deck lights - coming into > an anchorage and having a bowman preparing to drop the hook for example
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