In a previous post, someone said that no part of the system should go in the the house ground. Would that apply to the third prong on the NST plug? Also, I've had a request to take my coil(powered of of 15kv 30ma NST) "on the road" to show it off. What things could I ground to if I dont take my 8' grounding rod? Would any metal object be fine as long as it's large enough? Marius Grigoriu