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Can you expand a bit please Dave? Is it because the insulation tape is not thick enough to offer basic insulation? Also with regard the heatsink are you talking about the different types of heatshrink? Thick glue lined as opposed to thin not glued?
No it’s because the glue goes off and the tape loosens, becomes a sticky mess and falls off after a few years, you must have come across this on installations?
I mean the choice of heatshrink with regards having the correct voltage rating and mechanical properties as needed, also it may need to meet standards for flammability or lsf insulation etc. Each application is going to be different and may need different materials.