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Hi Steve, I think I might gain some roof height by moving the coil somewhat, before I bring the jack hammer. But the coil will be closer to the lighting armatures on the left, and the incoming power lines on the back wall, so I must protect these with grounded copper mesh first. I would not like the streamers to hit the 63 amp power cables. I will have to take more careful measurements of the spark gap distance, I must admit that I pulled the 3kV/mm figure out of my hat, rather than basing it on solid facts. Jan Stockholm, Sweden Skickat från min iPad _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla