some tar ballasts require a grounding plane to fire the tubes properly.. this can be as simple as a wire run above the bulbs from one end to the other but not touching the bulb. some older electricians probably remembers more about this as it isn't very common anymore as far as I know of.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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