Enammelled copper wire twisted and bifilar wound for pulse transformer?

[treez]

Hello,
We wish to do a high side pulse transformer gate drive for Full Bridge SMPS with 400VDC input.
We would like to wind the pulse transformer torroid with Triple insulated wire, but our volumes are too small to be able to buy any. Therefore, will it be ok to just use two strands of enamelled copper wire twisted together (bifilar) to wind the torroid with? (I believe it has a rating to 1000V anyway)?

 

[FvM]

our volumes are too small to be able to buy any

Sold in 100m quantities from a UK online shop, as Edaboard users know from a recent thread.

 

[Warpspeed]

Check out the wire sold for wire wrapping.
Its teflon insulated, and pretty good stuff with regards to temperature and voltage.

 

[schmitt trigger]

What are your insulation requirements between the pair of windings?

What sort of risks will you encounter if the insulation fails?

Do you require to meet Regulatory Agency's requirements?

 

[andre_luis]

Many time ago we used a copper wire with PVC insulation due to its ability to deal with high voltages. I'm not sure if is suited as winding transformers, but could try.