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1/4 inch wide dielectric foil tape
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TOPIC: 1/4 inch wide dielectric foil tape

1/4 inch wide dielectric foil tape 1 year, 3 months ago #2221

I am looking for a supplier for 1/4 inch wide, adhesive backed, foil tape for dielectric testing of shaped wire.
Any suggestions?
Thanks

Re: 1/4 inch wide dielectric foil tape 1 year, 3 months ago #2222

Hello wirenut4sure,

I imagine the foil is for some type or qualification test and the small width of the tape, along with the adhesive backing, certainly makes the application to the wire difficult. Is there another way to test the dielectric strength of say the enamel such as a water immersion test or is there a problem of water penetration. What about a wet sponge, connected to a spark tester before the shaped wire is spooled?

At one time, sparker connected wet sponges were very common for routine in-line dielectric testing of telephone wire singles at primary extrusion.

Regards,
Peter J. Stewart-Hay P. Eng.
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

Re: 1/4 inch wide dielectric foil tape 1 year, 3 months ago #2223

Wirenut4sure
Try burgular alarm foil tape that is used to stick on windows for alarm systems - most electronic stores will have it ( in my country Dick Smith electronics, radio shack etc), stick this to 1/2" masking tape, can be reused lots of times. I used this for years in Dielectric testing of enamel, Kapton and powder coated transformer strip & motor windings.

Re: 1/4 inch wide dielectric foil tape 1 year, 3 months ago #2224

LawrieWhite
I'll try this source. This tape is supplied as a "pancake". As it is dereeled it is mated with 3/4 inch masking tape which is then wrapped 3-4 tips around the conductor.This is a Nema test
Thanks

Re: 1/4 inch wide dielectric foil tape 1 year, 3 months ago #2225

It's a test for shaped magnet wire. From memory you take a piece of wire a specified length. You wrap the foil tape around the insulated portion of the sample. You scrape off insulation at one end. You put a wire lead with alligator clip to the end you scraped the insulation from and another clip to the foil. The test device then gradually increases the voltage/load until the insulation breaks down. Hopefully when the insulation fails, it is above the minimum required value.

rb

Re: 1/4 inch wide dielectric foil tape 1 year, 3 months ago #2226

Hi Spectre,

Is this a regular production test or some kind of type or qualification test?

Likewise is it to verify the rating of the enamel in question for the application it is to be used on (such as say a 6oo volt winding) or is it to prove the the theoretical dielectric strength of the enamel (such as say "x" volts per mil of coating thickness)?

Best Regards,
Peter J. Stewart-Hay P. Eng.
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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