How to Use a Cable Stripper? | Match The Tool To The Cable

A cable stripper cuts insulation or jacket cleanly when you match the tool to the cable and set the blade depth correctly.

A cable stripper isn’t one tool with one method — it’s a family of tools built for different cables. The core skill, though, stays the same: match the tool to the cable, set the cut depth so it scores rather than cuts through, and pull the jacket off without nicking what’s underneath. Get that right and you’ll strip anything from a lamp cord to coax cleanly on the first try. This guide covers the three most common situations: standard insulated wire, rounded jacketed cable, and the safety steps that come first every time.

What Cable Stripper Do You Need?

The tool must match the cable family. A manual wire stripper works for insulated building wire and lamp cord. An adjustable cable stripper with a blade-depth knob handles jacketed cable like coax and Ethernet. Flat telephone cable needs its own flat-cable stripping area. The wrong tool nicks conductors or fails to cut, so pick the tool that fits the cable before anything else. If you’re choosing one for a range of jobs, check what cable sizes each model handles before buying.

How To Strip Standard Insulated Wire

For plain insulated wire, the technique is straightforward once the power is off.

• De-energize the circuit at the breaker and confirm the wire is dead with a voltage tester before touching anything.
• Pick the correct notch matching the wire gauge — the wrong slot either nicks the conductor or won’t cut the insulation.
• Insert the wire so the strip length sits centered in the jaws, then squeeze the handles to cut the insulation.
• Pull the insulation off and inspect the conductor to make sure the metal core is intact with no nicks or broken strands.

SparkFun’s method adds a small refinement: squeeze about 1/4 inch from the wire end, twist slightly, and pull — that slight rotation helps the blades bite through the insulation evenly. Avoid rocking or torquing the tool during the cut, since that damages strands and leaves uneven strips. If you strip this kind of wire often, a tool with a broad gauge range keeps you from switching tools between jobs.

How To Strip Jacketed Cable Like Coax Or Ethernet

Jacketed cable is where blade depth matters most. The goal is to score the outer jacket, not cut through it into the shielding or inner pairs. trueCABLE’s guide for its adjustable cable stripper shows the core sequence: raise the blade with the adjustment knob, seat the cable with about 2 inches extending out the right side, then turn the knob clockwise until the blade contacts the jacket firmly. Rotate the tool around the cable — about two rotations for that tool — then bend and pull the jacket free.

TE Connectivity’s coaxial cable stripper works differently but proves the same point: set the slide to position 4 or 5, close and latch the tool, then rotate it around the cable about five times at each position before moving through the sequence. Model-specific instructions like those matter because each tool has its own blade geometry. Blade depth set too deep damages shielding or inner conductors; set too shallow, and the jacket won’t score cleanly. For Ethernet cable, score lightly so you don’t cut into the twisted pairs.

Safety And Common Mistakes

Every mistake worth naming comes back to the same few errors. Stripping a live wire tops the list — always test for voltage first. Using the wrong gauge notch or cable guide nicks conductors or leaves insulation uncut. Cutting through the jacket instead of scoring it ruins coax and data cable. And pulling too hard after an incomplete score tears the insulation unevenly.

For high-reliability installs, inspect the conductor after every strip. Any nicks, broken strands, or stretched insulation mean the tool size or depth is wrong — fix that before continuing. For sealed or penetrator systems, keep the jacket cut straight across and perpendicular to the cable so the seal fits properly. Blue Robotics notes this for its WetLink cable jacket stripper, which handles diameters from 4.5 mm to 29 mm — proof that even specialized tools follow the same score-and-remove principle.

Once you know exactly what you’re stripping, a good tool makes the job noticeably easier. Our tested roundup of top-rated cable stripping tools compares the models worth your money.