I had a somewhat close encounter with some lines today, running my 30 ton crane. The guy I was working with is an old construction hand, like me, and a friend, and when I first pulled up to the job site we first discussed the nearby lines. 20 minutes later, as I'm, rotating around with the load (a big solar array) I caught myself boomed down more then I needed to be and IF I had continued to rotate, and IF the array had swung on it's axis, I MAY have come within 2 or 3 ' of the 440 V lines. Not to make it more exciting then it was, (I never got closer then about 15') I re-remembered the lines (hard to see, duhhh) in plenty of time, and was not too close, and my buddy was paying attention, in fact when I brought it up later ("almost forgot about those lines) he said. "yeah, me too, then I remembered and was about to say something right when you stopped." So....not a huge deal, but the frigging irony of a crane being operated by a often low flying pilot who was setting solar panels getting tangled up was a bit much. Once the array was set on the pipe, and rotated into a true south position, it was noted that the power line clearance was about 6'. I had nothing to do with the locating of these poles, kind of a screw up on his part, it will be interesting to see if the utility squawks.