Why the right CCTV leads matter for performance and uptime
Choosing the correct CCTV leads (video, power and hybrid cables) affects picture quality, noise, and camera reliability more than many installers realise. We focus on practical outcomes: low-noise video, correct voltage at the camera, easy routing, and serviceable terminations - all sourced from local stock to avoid project delays.
Common CCTV lead types and where to use them
- RG59 / RG6 coaxial: standard for analogue BNC systems; shorter runs and simple installations.
- Siamese cable (coax + twin power): popular for analogue and HD-analogue installs to carry video and 12V/24V in one sheath.
- UTP with baluns (Cat5/6): cost-effective for long runs or when using IP encoders or video baluns.
- DC power cables (2.1/5.5 barrel-compatible cores): sized to minimise voltage drop to the camera.
- POE cables (Cat5e/6): for IP cameras, combining data and power over a single cable where POE switches or injectors are used.
If you're not sure where to start, compare categories in our Collections or browse brands on our Shop by Brand page for components commonly used in surveillance installations.
Specification quick-check: what to compare
Before ordering, verify these cable specs against the camera and installation plan to avoid rework and downtime.
| Specification | Why it matters | Typical recommendation |
|---|---|---|
| Impedance (ohm) | Mismatch causes reflections and picture loss | 75 ohm coax for BNC |
| Core gauge (AWG/mm2) | Affects voltage drop for camera power | 22-18 AWG for runs under 30 m; 18-16 AWG for longer |
| Shielding | Prevents interference in noisy environments | Foil + braid for industrial sites |
| PoE standard | Defines power available to IP cameras | 802.3at (PoE+) for PTZ and higher draw |
Real-world example: choosing a lead for a 100 m dome camera run
Scenario: 12 V dome camera, 250 mA consumption, 100 m cable run. To keep voltage drop under 10% (1.2 V): use Ohm's law and cable resistance.
Calculation (simplified): Vdrop = I x R. For 18 AWG twin power, approximate resistance ~0.021 ohm/m. Round trip = 200 m. Vdrop = 0.25 A x (0.021 x 200) = 1.05 V (acceptable). If using 22 AWG, resistance is higher and Vdrop may exceed 1.2 V; choose thicker conductor or POE solution.
For IP cameras, prefer Cat6 for future-proofing and easier POE delivery. See compatible product ranges in our buy-cctv-leads index.
