On a custom luminaire to a ballast we need to use high voltage cables as the strike voltage is in the region of 4kV albeit for a momentary time whilst the lamp strikes. IF we used cable rated (individual conductors) for 4kV, what should we use for a shroud around all the conductors? I've obviously enough suggested that the shroud/outer coat (call it what you will) should be rated for 4kV accordingly. Try telling that to the mechanical engineer running the project! Any suggestions? Am i right or is it allowable to derate the isulation properties of the shroud as the high voltage is momentary only?
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