In the world of RF engineering, surveillance systems, and telecom infrastructure, a practical question keeps coming up:
“Can a coaxial cable carry electrical current—or is it only for signal?”
The short answer is yes, it can—but only under specific conditions.
As a company deeply involved in manufacturing and customizing coaxial cable assemblies, we often help buyers and engineers navigate this exact concern. Whether you’re powering a satellite LNB, integrating a Power over Coax (PoC) camera, or building an RF feed line with bias power, knowing how much current a coax cable can carry—and how to do it safely—is essential.
This guide walks you through the theory, limitations, and real-world best practices for using coax cables as a current-carrying medium.
What Is a Coaxial Cable Designed For?
Traditionally, a coaxial cable is designed to transmit high-frequency signals with minimal interference. Its structure includes:
- Center conductor (usually copper or copper-clad)
- Dielectric insulation
- Outer shield (braid or foil)
- Outer jacket
This shielding design makes coaxial cables ideal for transmitting RF, video, or broadband signals over long distances. However, that doesn’t mean they can’t also carry low-voltage current—especially when designed intentionally for dual-purpose use.
Can Coaxial Cable Carry Current?
Yes, coaxial cables can carry electrical current—but they are not all created equal.
Key Scenarios Where Coax Carries Current:
- Power over Coax (PoC) in CCTV or surveillance systems
- Satellite dish LNB powering (typically 13V/18V DC via coax)
- TV amplifier insertion using inline power injectors
- RF bias-T applications (combining DC + RF in one path)
But not all coax types or configurations are suitable. The voltage, current level, conductor material, and cable length must be carefully matched to the application.
Typical Voltage and Current Levels in Coaxial Applications
Here’s a quick comparison of how coax cables are used for power transmission in different systems:
| Application | Voltage Range | Current Load | Cable Type | Notes |
|---|---|---|---|---|
| TV Amplifier Insertion | 5V – 12V | <500ma | RG6 / RG59 | Typically via F-type inline power |
| Satellite Dish (LNB) | 13V / 18V | ~500mA | RG6 | Voltage controls LNB polarization |
| CCTV PoC Systems | 12V / 24V | 1 – 2A | RG59 / RG6 | Requires PoC-compatible gear |
| RF Bias-T Feed | 5V – 48V | <1a | RG174 / LMR200 | DC + RF separation needed |
Ask Yourself:
Will my coax cable carry just power, or power + signal together?
This will determine whether standard coax is enough—or if you need PoC-optimized systems.
What Affects Coaxial Cable’s Ability to Carry Current?
Several physical and electrical properties directly affect whether your coax can safely carry current:
Conductor Material
- Solid copper has the best conductivity
- CCS (Copper-Clad Steel) has poor current-carrying capacity
- CCA (Copper-Clad Aluminum) is not ideal for PoC
Cable Length and Gauge
- The longer the cable, the greater the voltage drop
- RG6 handles more current than RG59 or RG174
- Use lower-loss cables (e.g., LMR400) for long runs
Connector Quality
- Poor-quality BNC or F connectors introduce resistance and heat
- Always use compression/crimp connectors rated for current handling
Power Type
- DC is typical (12V/24V)
- Never run 220V AC through coax unless it’s part of a specialized, shielded hybrid system
Risks of Using Coax for Current (If Misapplied)
Using coax as a power line without proper design can lead to:
- Excessive voltage drop
- Connector heating and potential melting
- Interference between signal and power (if no filtering is used)
- Device failure or cable burnout
Never attempt to DIY power transmission through coax without isolation filters, testing, and proper specifications.
How to Safely Use Coax for Power and Signal
Here’s how you can correctly and safely use coaxial cable for carrying current:
Use Certified PoC Systems
- Designed for simultaneous signal and power
- Comes with bias-T filters or power inserters
- Ideal for IP cameras, centralized power units
Choose the Right Cable for Current Loads
- Use solid copper RG6 for 1A+ applications
- Stick with 50Ω cables for RF modules with DC feed
- Consult attenuation + DC resistance ratings
Test Voltage Drop Over Distance
- For longer than 30 meters, test voltage at the endpoint
- Watch for more than 10% drop—it affects camera and LNB performance
Choosing the Right Coax Cable for Current-Carrying Use
| Use Case | Recommended Cable | Max Current | Connector Type | Notes |
|---|---|---|---|---|
| Satellite Dish (LNB) | RG6 Solid Copper | ~0.5A | F-type | Standard 13V/18V DC feed |
| CCTV PoC (Long Run) | RG6 or RG59 | 1 – 2A | BNC | PoC filter required |
| TV Amp w/ Power Inserter | RG6 | <0.5a | F-type | Inline power supply box |
| Bias-T RF Feed | RG316 / LMR200 | <1a | SMA / MCX | Used in RF frontend designs |
FAQs: Coaxial Cable and Current
Q1: Can I run 12V DC through coaxial cable?
Yes, many systems do. But make sure the coax is solid copper, and connectors are current-rated.
Q2: Is it safe to power a camera over coax?
Yes—if using PoC-compatible equipment. Don’t try DIY 2-wire + coax merges.
Q3: Will current degrade the signal quality?
Not if filters (bias-T, diplexers) are used to isolate DC from RF/video.
Q4: What’s the risk with cheap coax cables?
Cheap cables (CCA/CCS) have higher resistance, leading to heat, power loss, or equipment failure when carrying current.
Q5: Do I need special connectors for PoC?
Yes. Use high-grade compression BNC/F connectors with low resistance, and avoid push-on types.
Bafitop: Power-Carrying Coax Assemblies You Can Trust
At Bafitop, we engineer and manufacture coaxial cable assemblies specifically designed to handle both signal and power safely.
Our offerings include:
- PoC-compatible RG6/RG59 assemblies with verified solid copper
- Pre-terminated coax with BNC, F-type, SMA, MCX connectors
- Engineering support for bias-T, RF module, and satellite projects
- Factory testing for voltage drop, insulation, and thermal resistance
- Global delivery and sample availability for project testing
Whether you’re powering an LNB in an outdoor antenna, or designing a CCTV system that needs fewer cables, we help simplify your wiring—without sacrificing safety or performance.
Let’s Build Smarter Cable Systems
Need to carry current through coaxial cable safely and reliably?
Want to explore custom PoC cable assemblies?
📧 Contact us at: sales@bafitop.com
📞 Call us: +86-15817341810
Our technical team is ready to support your next project—from concept to global deployment.
Conclusion: Yes, Coax Can Carry Current—But With Caution
So, is coaxial cable capable of carrying current?
Yes, but it depends on how you use it.
With the right conductor material, voltage control, and filtering, coax can safely handle both power and signal. Just don’t treat it like a traditional electrical wire—because it’s much more sensitive.
Choose wisely. Use tested assemblies. And always consult with professionals like Bafitop when integrating power through coax.
