My opinion based upon working with 20KV, 200KV:
You need to have the outer shroud rated for 4KV also.
First, suppose the lamp doesn't strike? Then the 4KV is there a long time.
Second, insulation is a "tricky" thing. Its ability to hold off voltage
doesn't add, unless the materials are *very* identical and even then you
shouldn't trust it.
- Robert -
-----Original Message-----
From: Paul Smith <[email protected]>
To: [email protected] <[email protected]>
List-Post: [email protected]
Date: Tuesday, January 11, 2000 4:32 AM
Subject: Luminaire Ballast
>
>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?
>
>TIA
>
>Paul
>
>
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