Was working on the solar panel array on my box truck, making the hookup wires. The connectors and wiring I am using is rated at 1kV in wet environments. TUV 2PfG 1169 PV1-F standard. I was cutting and splicing the wires longer and it got me thinking what was the voltage rating on the double wall adhesive heat shrink. Much to my surprise there wasn’t a rating printed on the sleeve or the roll!
I found this document that states some materials and voltage ratings for different environments.
Looking up the material of the heat shrink I was using it looks like the “wet” environment Polyolefin, Adhesive Lined (Cross-Linked) guidelines are applicable. Which gives me ~200 V/MIL. A mil seems pretty thin for 200V!
Heat shrink is pretty tough to measure out the wall thickness (squishes) but I am getting around 25mils of thickness.
I ended up putting two tubes of heat shrink over the splices with ample overlap.
Anyone else ever have to think about voltage ratings of heat shrink? Experiences?