Sparky's Journal

📅 August 31st, 2026

Sparky’s Journal
Sparky’s Journal: Never Rely on a Tic Tracer

By JoshTheSparky.com (@JoshTheSparky4) (@JoshTheSparky on X)

Never rely on a tic tracer. I’m not saying they are completely useless, because they definitely have their place, but I think they become way too trusted on job sites. At some point, you have to ask yourself what that thing is actually telling you.

Especially with MC cable, a TIC tracer can become pretty useless. You have conductors inside insulation, inside the sheathing, and that sheathing is everywhere. You are standing there on the outside of the cable trying to determine what is happening to the conductor inside without actually making contact with it. That is the entire idea behind a non-contact voltage tester, but it is also its biggest limitation.

If the copper is exposed enough that the tester can easily detect it, you already have a problem because energized copper shouldn't be sitting there exposed for you to casually approach. If the copper is not exposed, you're depending on the tester to detect what is happening through the insulation, sheathing, and everything else around that conductor. So when it doesn't detect anything, what exactly have you proven?

Nothing.

You have proven that the TIC tracer didn't detect what it was looking for. That is not the same thing as proving the circuit is off.

This is why I think relying on a tic tracer to determine whether something is safe is almost no better than relying on word of mouth. At least with word of mouth, you know you're relying on another person's information. With a TIC tracer, people can convince themselves that they personally verified something when all they really did was wave a tester around it.

The better approach is to actually know what you're working on. If you have blueprints, diagrams, one-lines, panel schedules, or other documentation available, use them. Trace the circuit. Figure out where it comes from and what you're actually dealing with before you start putting your hands on things.

If possible, shut down the section of the area you're working in. Make it known that you're working there. Don't just shut something off and assume everyone around you knows what is happening. Communicate it and control the area you're working in.

And don't just take someone's word for it.

Your journeyman might tell you it's off. Your foreman might tell you it's off. Someone else might have worked on it yesterday and tell you it's been off all day. That doesn't mean you should blindly grab the conductor because somebody else said it was dead.

Your superior does not care about your safety more than you should, and they are not the person responsible for you putting your hands on that conductor. You are.

You have to verify it yourself.

That doesn't mean ignoring your journeyman or your foreman. It means understanding that their word is not your verification. If somebody tells you something is off, that's information. Now you need to know how it was shut off, what it controls, and how you are going to verify that for yourself.

I want electricians to get into the habit of asking themselves, "Is this really off?" Then immediately ask, "How do we know?"

Those are two simple questions, but they can change the way you approach electrical work.

Maybe the panel schedule is wrong. Maybe the wrong breaker was shut off. Maybe somebody changed the circuit. Maybe there is another source. Maybe the person who told you it was off was simply wrong. You don't know until you actually establish what is going on.

So let's turn this off and make it known I'm working here.

Trace the circuit if you can. Shut down what needs to be shut down. Communicate with the people around you. Use the appropriate test equipment and verification procedure for the work you're doing. Then make sure you actually know what you're about to touch.

A tic tracer can be useful. Keep one in your bag. Use it when it makes sense. Just don't let a little pen telling you that it doesn't detect anything become the reason you decide to grab a conductor.

Never rely on a tic tracer. Verify it yourself.