Running security camera cables through your home isn’t rocket science, but it’s also not just any old wire. The cable you choose affects video quality, power delivery, and how much headache you’ll have later when something goes wrong. Whether you’re wiring a single doorbell camera or a multi-camera system, understanding the basics of security camera wire, coaxial versus Ethernet, gauge ratings, and shielding, makes the difference between a solid DIY installation and one that leaves you troubleshooting interference and signal loss. This guide walks you through the wire types, specs, and installation steps so you can make informed choices and get your cameras working reliably.
Key Takeaways
- Choose coaxial cable for analog video systems and longer distances, while Ethernet with PoE is ideal for modern IP cameras that integrate power and data into a single line.
- Use RG-6 coaxial cable with 95% or better shielding for runs over 300 feet or near electrical interference, and upgrade to 16 AWG gauge to reduce signal degradation.
- Security camera wire installation requires proper strain relief every 12–18 inches, separation of data and power lines by at least 6 inches, and professional-grade crimping tools to avoid signal loss and connector failures.
- Common wiring mistakes—such as reusing old house cables, bundling security camera wire tightly with power lines, and skimping on shielding—are responsible for most system failures, not faulty equipment.
- Perform annual visual inspections of cable jackets and connectors, and test with a known-good cable to quickly diagnose video quality issues, interference, or power problems.
Understanding Security Camera Wire Types
Not all security camera cables are created equal. The two main types, coaxial and Ethernet, serve different purposes and work best with different camera systems.
Coaxial Cable vs. Ethernet: What’s the Difference?
Coaxial cable (or “coax”) looks like the cable that runs into your TV, a single solid center conductor wrapped in insulation, then a braided shield, then an outer jacket. It excels at carrying analog video signals over longer distances without significant signal degradation. If you’re running an older analog camera system or a newer analog-over-coax (AoC) setup, coaxial is your go-to. Common coax types for security cameras are RG-59 and RG-6. RG-6 has a thicker center conductor and better shielding, making it the more robust choice, especially if your run is longer than 300 feet or passes near sources of electrical interference.
Ethernet cable, on the other hand, contains four twisted pairs of copper wires inside a jacket. It’s designed for data and can carry both video and power in modern systems, particularly with PoE (Power over Ethernet) technology. Cat5e and Cat6 are the standard grades for residential security work: Cat6 handles higher speeds and performs better over longer distances if you’re running IP cameras. Ethernet is cleaner to install in terms of logistics (one cable does the job of two with coax plus power), but it requires compatible PoE equipment at the source.
Coaxial wins for analog setups and pure video transmission over very long runs. Ethernet wins for integrated power and data on modern IP systems.
Key Specifications to Know
When shopping for security camera wire, a few technical specs matter more than others.
Gauge refers to the thickness of the center conductor in coaxial cable, measured in AWG (American Wire Gauge). Lower numbers mean thicker wire: 18 or 16 AWG is standard for security camera coax. Thicker wire has less resistance and performs better over distance. If your run is under 200 feet, 18 AWG is fine. Beyond that, step up to 16 AWG or even 14 AWG for critical installations.
Impedance, measured in ohms, must match your equipment. Coaxial cable used for video (like RG-6) is typically 75 ohms, while audio cables run at 50 ohms. Never mix them up, or you’ll get signal reflections and noise. Check your camera or recorder spec sheet to confirm the correct impedance.
Shielding quality is critical, especially in electrically noisy environments. Coaxial cable has an outer braided shield: look for 95% or better coverage. This blocks interference from nearby power lines, fluorescent lights, and WiFi equipment. Budget “CCA” (copper-clad aluminum) coax: spring for solid copper or 100% braided copper shielding if you’re running cables near electrical panels or outdoor power lines.
Velocity factor (for longer runs) is a minor detail for residential work but worth knowing. It affects signal timing in very long cable runs (500+ feet). Standard video coax sits around 66% velocity factor: for most home installs, this is negligible.
Ethernet cables are rated by category, Cat5e supports up to 100 Mbps reliably, Cat6 up to 1 Gbps, and both work fine for PoE security cameras. Buy solid core for permanent in-wall runs, stranded core for patch cables where flexibility matters.
Installation Best Practices for DIY Setup
Proper installation is half the battle. Sloppy cable runs lead to interference, poor video, and frustration later.
Start with a plan. Run the cable path, from camera location to recorder or PoE switch, on your home’s exterior or through attics and crawlspaces. Avoid running cables parallel to power lines for long distances: perpendicular crossings are fine. Measure twice, buy 10–15% extra cable for slack and connector terminations.
Separate power from data. If you’re running both coaxial video and 12V power wires to an analog camera, keep them physically apart. Use cable clips or wire trays to maintain at least 6 inches of separation from AC power lines and electrical conduits. This reduces crosstalk and EMI (electromagnetic interference).
Use proper connectors and crimp tools. Coaxial cable terminations use BNC connectors (twist-on or crimp-style). Crimp connections are more reliable and professional-looking: hardwired IP security camera systems benefit from solid terminations since they run 24/7. Invest in a coaxial cable stripper and crimper (around $20–40) rather than using a utility knife, which tears the shield and causes shorts.
For Ethernet, a punch-down tool and RJ45 crimper are essential if you’re terminating cables yourself. Alternatively, buy pre-made patch cables in the length you need, they’re cheap and eliminate termination errors.
Protect cables outdoors. Use UV-resistant conduit or cable jacket for any run exposed to sunlight: UV degrades insulation in months. In wet areas or underground, step up to UV-rated outdoor-grade coax. Seal any entry points into walls or conduit with caulk to prevent water intrusion and pest entry.
Strain relief is your friend. Don’t let the cable weight hang on the connector. Use clips or loops to support the cable every 12–18 inches on vertical runs. At the camera end, loop the excess slack and tie it off with velcro straps so a tug on the cable doesn’t yank the connector loose.
Common Wiring Mistakes to Avoid
Most camera system failures don’t stem from bad equipment, they stem from installation shortcuts.
Using the wrong gauge or shielding tops the list. Cheap, thin-gauge coax or cables with poor shielding degrade over 100–150 feet, causing signal ghosting, color shifts, or complete loss. Don’t skimp here: the cable cost is tiny compared to the frustration of a failed system.
Reusing old house wiring is tempting but wrong. That ancient coax in your walls from cable TV or the old phone pair in your attic isn’t rated for your security cameras. Odds are the insulation is brittle, the shield is compromised, and impedance doesn’t match. Run new cable.
Bundling cables tightly with power lines creates inductive coupling and interference. Even short distances matter if the cables are in contact. Use separate conduit or maintain spacing.
Daisy-chaining power supplies on analog systems drains voltage at each camera, leaving the last one underpowered. Use a dedicated power supply for each camera or a central hub with adequately sized output for the total amp draw. Calculate: if each camera draws 400 mA, four cameras need a 2-amp minimum supply (with headroom).
Forgetting to strain-relieve the camera connection is almost guaranteed to break. The connector isn’t a handle. Secure the cable with a clip or bracket near the camera housing so weight and vibration don’t stress the solder joints.
Mixing cable types in the same run confuses equipment and degrades signal. Pick one type for the whole system and stick with it. If retrofitting, use adapters at transition points, not along the cable run.
Smart home tech reviews from CNET and Digital Trends often highlight how poor cabling sabotages otherwise solid camera installations.
Maintenance and Troubleshooting Your Camera Cables
Over time, exposure and vibration can degrade even good cables. Regular checks catch problems early.
Visual inspection. Once a year, walk your camera locations and look for cracked jackets, exposed shield, or connectors that have worked loose. UV damage looks like brittleness or fading on the outer jacket. Cracks in the insulation are a serious problem, moisture will eventually short the circuit. Replace any visibly damaged sections immediately.
Check connectors. Coaxial BNC connectors can loosen from vibration or thermal cycling. Hand-tighten them once or twice a year. If a connector is corroded (green or white crud), unscrew it, wipe both the connector pin and the socket with a dry cloth or isopropyl alcohol on a cotton swab, and reconnect. Corrosion causes intermittent signal loss.
If your video drops or becomes noisy, the first troubleshooting step is the cable. Disconnect the cable from both ends, visually inspect for damage, then reconnect firmly. Jiggle the connector slightly, if the signal returns, the connection was loose. If the problem persists, the cable itself is likely bad. Swap in a known good cable of the same type to confirm.
Power issues manifest as dim or flickering video. Check that your power supply is rated for the total amperage. On PoE systems, confirm the switch or injector is supplying voltage and that the cable run isn’t so long it’s exceeding PoE limits (typically 100 meters for standard PoE). A cable tester ($15–30) can verify voltage drop across a run.
Intermittent signal loss often points to a weak connection or a cable kink. Follow the entire run and straighten any tight bends. Coaxial cable shouldn’t bend tighter than a 1.5-inch radius: Ethernet should stay above 1 inch. Kinks damage the inner conductor and cause intermittent faults that are maddening to diagnose.
When in doubt, replace the cable. A 50-foot run of quality coax costs $15–30. The time you save troubleshooting is worth it, and you’ve got a known-good spare for the future.
Conclusion
Security camera wire might seem like a commodity, but the details, cable type, gauge, shielding, and installation technique, directly impact your system’s reliability. Take time to choose the right cable for your setup, run it properly with good strain relief and separation from power, and check connections periodically. A well-wired security system will run without complaint for years. Cut corners, and you’ll be chasing signal problems and phantom failures. The investment in quality cable and a careful install pays dividends.
