I have a theory that one of the main houses I work in is Overvolting. At this point it could be overvolting or there could be voltage in the ground, or possibly a hertz drop. Again, I haven't tested anything yet. I'm usually not quick to jump to some of the larger problems but this has been pretty consistent over a two year stretch. My indicators are that we're a five year old house that has a relatively new stock of Strand SL's. We blow though lamps, spending well over twice on lamps in the new house as we do in the old space. Also I notice that a lot of my lamps are burning out from the socket instead of blowing the glass. Some of our bases are now useless because of burnouts. My question is two fold, one is, what is the safest way to check for overvolting ( I have a multi-meter) and two is there any possibility i could be missing. I'm still learning a lot about Three phase systems, and I have no plans of putting my self at risk. I have a little basic installation experience. I'll try and find out what kind of Transformer they have there because I think if they are using an open delta then that might be part of the problem. Just looking for a little input.