TEX-ELZ insulated copper wire for transformer windings....only rated to 1000vrms?

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You are possibly confusing voltage rating (operation voltage) with test voltage.
 
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Also bear in mind that the voltage is across two layers of insulation (one on each turn) and the voltage from one turn/layer to the next will only be a small proportion of the total voltage across the winding. The primary and secondary sides will (hopefully!) also have additional isolation by distance, an intermediate screen or be wound on a different part of the bobbin.

Brian.
 
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The primary and secondary sides will (hopefully!) also have additional isolation by distance, an intermediate screen or be wound on a different part of the bobbin.
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Possibly, but these triple coated wires are in fact designed to act as reinforced insulation without additional dielectric layers.
 
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Thanks, the secondary will be plain ECW, and only separated by a layer of kapton from the primary for the sake of making it easier to wind over. There will be no margins
 

The table & footnotes indicate they are rated for 1000 Vrms but tested for 1 minute at 3kV and as a differential pair up to 6kV.

Regarding isolation tests, 1 layer of kapton with give additional to secondary from primary and is the essential added insulation barrier especially when the secondary is also grounded ( worst case stress ) HV insulation test is done with Line & Neutral shorted during HIPOT test.
 
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