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Peeling Sheath from Shielded Wire

I've never had a particular problem. I usually just use a sharp knife to cut almost through the outside insulation (carefully avoiding damage to the conductors) for the desired length, manually completely splitting the insulation and then peel back and cut the insulation off. Or are you concerned about the metal braid / conductive foil shield? Details of what cable you are using?
 
Not sure why it should be a struggle. Is it stuck to the wire somehow? You should be able to unwrap it after you remove the outer insulation. Post some pictures so we can help?

I have stripped all kinds of shielded wire for years in automation and control. For vfd or any other control that may encounter large noise or interference. Remember to star ground all your shielding to 1 point that is bonded to your mains ground. Do not terminate the shield at the device side unless it is isolated from connection to other components. Do not expose more then a couple inches of the shielded wire as this can defeat the use of shielded wire.

Just to add, make sure that your vfd and motor are solidly bonded to ground. A lot of machine equipment does not have proper bonding at the motor. I have seen many times in troubleshooting where the bond for the motor was not a good bond and noise from the motor caused issues with the vfd. Also if you continue to have noise issues look at using a reactor to limit the noise to the vfd or mains.

Here is an abb tech article on the issue, there are others as well.
 
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I'm rewiring my VFD controls . This time I'm using 18ga 4wire shielded. Getting the sheath off is a struggle, is there a trick ?

With an Olfa knife, score the outer insulation in a circle, and then flex it side to side. This has worked for me to break all the way through the outer insulation leaving the next layer undamaged.

If it's exceptionally tough to remove, sometimes a little squeeze along the insulation with linesmen pliers will help loosen it up.
 
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