In this article I will discuss how to strip the jacket off of NMD90 wire.
This article is part of a cutting in series, so make sure to read the other articles!
(Cutting in is a term electricians use in the rough-in stage where they prepare their wires by removing the insulation jacket, entering the wires into an electrical box, and stripping conductor insulation to prepare for splicing).
What We Cover in this Article:
- Ways to Strip Wire Jacket off NMD90 Electrical Wire
Ways to Remove NMD90 Wire Jacket
How electrical cables work is there is an outer jacket, also known as the “sheath”. We remove this, which exposes the conductors. (Sometimes wires have additional layers of protection, such as a “jacket”, then “armor”, then sometimes paper, and even sometimes ANOTHER jacket underneath it all.. then FINALLY the conductors).
But, we’re talking about NMD90 14/2.. typical residential home wire, and it just has a white jacket, and it has a black, white, and bond conductor waiting inside for us! ⚡
I won’t be covering removing AC90 (armored cable) sheathing in this article, only how to strip NMD90 14/2 wire (the most common wire for residential homes).
(I’ll also show you a cool picture and video below of “skinning the jacket” with a pocket knife, which an awesome journeyman taught me one time!)
Using an Exacto Knife (Snap Knife) to Remove Insulation Jacket:
To remove this jacket, we electricians use a knife, and each electrician has their own favorite knife.. (it’s not something you’re going to win in an argument.. 🤣)
My favorite way of removing this outer jacket is using a snap knife!
I’ve seen electricians use pocket knives, hook knives, or utility knives..
Step-by-Step Pictures of Stripping NMD90 Jacket:
And that’s it!
I use my favorite knife, gently score the jacket, then cut in a little deeper near the end of the jacket. I then pull the jacket back up the wire, and I KNOW the wires have not been damaged.
I then simply remove the excess jacket, and the next step would be to stick the wires into a box!
What is this “Wire Skinning” You Speak Of?
So first, I didn’t invent this.. it was shown to me!
If you’d like to see the full video of this wire skinning, check my video on the Best Knives for Electricians.
But, I did upload a little snippet to save you some time just below:
Here’s how the wire skinning works..
You have to use a really dull pocket knife. You simply SKIN the jacket off the NMD90, which allows for a really fast workflow.. I got pretty good at this, and over time and was even able to strip two wires at once!
I don’t think I ever skinned too deep and nicked the wire.. so it was a pretty solid and safe approach because the pocket knife is so dull 👍!
Conclusion.. Stripping NMD90 Wire Jacket
Alright, so make sure to read the other cutting-in articles..
You will learn:
- How to strip single conductors to expose the copper
- How to splice multiple wires for an awesome splice EVERY TIME!
Hope you have enjoyed the article and the website! 🙂
As always.. go for a laugh with some electrician jokes!