Direct answer: If a squirrel chewed a low-voltage wire, the right first move is to confirm it really is low voltage, then shut off power to the connected equipment before touching it. Most homeowner-safe work stops at inspection, isolation, and protecting the area until the damaged cable can be repaired or replaced correctly.
Most likely: Most of the time this is outdoor lighting, doorbell, thermostat, irrigation, camera, or internet/TV cable with visible tooth marks and exposed conductors. The bigger risk is misidentifying house power wiring or leaving a wet, nicked cable energized.
Start with what the wire serves and where it runs. A thin landscape-lighting cable in mulch is a different situation than a chewed cable entering siding, crossing an attic, or disappearing into a wall. Reality check: squirrel damage is often worse than the first bite mark you can see. Common wrong move: assuming every small wire is harmless and live-testing it by trial and error.
Don’t start with: Do not start by wrapping the damage with random tape and turning everything back on. That hides the problem and can leave a short, corrosion point, or shock hazard in place.
A doorbell, thermostat, camera, irrigation controller, or low-voltage lights quit, and you can see tooth marks or exposed copper on a small cable.
Start here: Identify exactly what stopped working, then shut off power to that equipment before getting closer to the damaged section.
Landscape lights are dead, dim, or intermittent, often with damaged cable near mulch, beds, or along a fence line.
Start here: Turn off the landscape lighting transformer first, then inspect the full visible run for more than one chew spot.
The cable jacket is nicked or split, but the connected device still works.
Start here: Do not leave it energized just because it still works. Isolate the equipment and inspect for exposed conductor, moisture, and hidden follow-on damage.
A squirrel chewed a cable near soffits, siding, attic framing, crawlspace framing, or where the wire enters the home.
Start here: Stop at visual checks and shut off the related equipment if you can identify it. If you cannot clearly prove it is low voltage, treat it as unsafe for DIY repair.
This is the most common pattern with landscape lighting, irrigation, and camera wiring. You usually see rough tooth marks, flattened insulation, and one obvious dead section.
Quick check: Follow the cable both directions from the visible damage and look for a second chew point, especially near shrubs, mulch edges, and fence lines.
Thermostat, doorbell, and similar control wiring can stop working from even a small break because one conductor opening is enough to kill the signal.
Quick check: Check whether the connected device went fully dead or lost one function right after the damage appeared.
A cable that worked at first may start acting up after rain, irrigation, or dew once the jacket is open and the conductors corrode or short together.
Quick check: Look for green corrosion, blackened copper, damp insulation, or symptoms that got worse after wet weather.
Small-gauge cable near siding, attics, garages, or utility entry points can be mistaken for harmless low-voltage wiring when it may be line voltage, alarm power, or part of another system.
Quick check: If the cable enters a wall, conduit, service area, or you cannot identify what it serves with confidence, stop before handling it.
You need to separate a simple outdoor control cable from anything tied into house wiring or hidden building spaces. That decision sets the safety line.
Next move: If you can clearly identify a low-voltage device or transformer feeding the cable, move to shutting that equipment off before closer inspection. If you cannot tell what the wire serves, or it disappears into walls, soffits, attic framing, or near the panel, stop and treat it as an unsafe identification problem.
What to conclude: A clearly identified low-voltage run is usually a repairable cable issue. An unknown cable is a safety issue first, not a repair guess.
Even low-voltage wiring can short, overheat a transformer, damage controls, or corrode fast once the jacket is open.
Next move: If the equipment is off and there is no heat or burning smell, you can do a careful visual inspection of the cable run. If you cannot safely de-energize the connected equipment, or anything smells burnt or feels hot, stop and call a pro.
What to conclude: A cool, dry, clearly isolated low-voltage cable is usually a contained wiring repair. Heat, odor, or uncertainty raises it into a higher-risk electrical problem.
Squirrels rarely stop at one bite. The visible chew mark is often just the first place you noticed, not the only damaged section.
Next move: If the damage is limited to one fully visible, accessible section of a clearly identified low-voltage cable, you have a defined repair path. If there are multiple damaged spots, hidden sections, or damage at a wall or attic entry, plan on cable replacement or professional repair rather than a quick patch.
The safe line here is narrow. Outdoor accessory wiring is one thing; hidden building wiring and uncertain cable types are another.
Next move: If the cable is exposed, clearly low voltage, and not part of concealed house wiring, arrange the correct repair or replacement with the system still off. If the cable type, route, or voltage is uncertain, call an electrician or the appropriate low-voltage technician and keep the damaged run out of service.
A repaired cable will just get chewed again if the route and entry points stay the same. The final job is both wiring repair and pest prevention.
A good result: Once the cable is repaired and the route is protected, restore power and confirm the device works normally without flicker, dropouts, or heat.
If not: If the device still fails after the cable repair, the connected transformer, controller, or equipment may also have been damaged and needs system-specific diagnosis.
What to conclude: The wire damage may be the first failure, but not always the only one. A clean repair plus pest control is what keeps this from turning into a repeat call.
Not as a real repair. Tape may cover exposed copper for temporary protection while the system stays off, but it does not restore damaged conductors, keep moisture out long term, or fix hidden chew damage farther down the run.
Start with what it serves. Doorbells, thermostats, landscape lights, cameras, irrigation controls, and many communication cables are often low voltage. If the cable disappears into walls, enters a panel area, or you cannot identify the source and destination clearly, do not assume it is safe.
It can be. Thermostat wiring is usually low voltage, but it often runs through equipment cabinets and wall cavities. The safer homeowner move is to shut off HVAC power, inspect only what is visible, and avoid guessing at splices inside the system.
Leave it out of service until the damage is addressed. A nicked cable can keep working for a while, then fail after rain, vibration, or corrosion. Working today does not mean safe tomorrow.
Call an electrician if the cable type is uncertain, the damage is near house wiring, or anything smells burnt or gets hot. Call the appropriate low-voltage technician when the damaged run is clearly part of a doorbell, camera, internet, irrigation, or similar accessory system.
Yes. A shorted or wet chewed cable can take out a landscape lighting transformer, stress a control circuit, or cause intermittent faults. If the cable is repaired and the system still does not work, the connected equipment needs its own diagnosis.