If you've ever found yourself huddled over a wiring schematic, troubleshooting a low-voltage control circuit, or choosing a cable for sensitive IoT sensors, you've probably asked a version of one question: "What size inductance do I really need here?" For anyone specifying, sourcing, or selling multicore wiring-especially a 6core 28 AWG cable-this question is not just theoretical. Inductance directly impacts signal integrity, noise immunity, and even power loss in small-scale circuits, so understanding it is critical to getting the right cable for the job. As a supplier of high-performance control and instrumentation cables, I field this question at least once a week from engineers, electricians, and small business owners, and it's one worth breaking down in detail.
First, let's start with basics: what is inductance, anyway? In electrical terms, inductance is a property of a conductor (or set of conductors) that opposes changes in electric current flowing through it. When current moves through a wire, it creates a circular magnetic field around that wire; if the current changes, the magnetic field changes too, and that change in turn generates a voltage in the same wire (called self-inductance) or in adjacent wires (mutual inductance). For multicore cables, like our 6core 28 AWG option, both self and mutual inductance matter. The number of cores, their wire gauge, how they're arranged, and whether they're shielded all shift the inductance value-so no two 6core cables will have exactly the same inductance, even if they use the same wire size.
28 AWG wire is a common choice for small, low-current circuits, right? It's thin, flexible, and perfect for applications like sensor wiring, industrial control panels, or wearable electronics where space is at a premium. A single 28 AWG solid copper wire has a self-inductance of roughly 0.15 to 0.2 microhenries (µH) per meter, but when you bundle multiple cores together to make a 6core cable, that number changes dramatically. The tight spacing between adjacent cores means their individual magnetic fields interact, boosting mutual inductance. That's why bundled conductors almost always have higher overall inductance than the same number of wires run separately.
So, what's the actual inductance of a standard 6core 28 AWG cable? To answer that, we have to account for the two most common configurations these cables come in: unshielded and shielded. Most 6core 28 AWG cables used in control and low-voltage applications are shielded, because they need to resist electromagnetic interference (EMI) from nearby motors, power lines, or wireless devices. Let's start with unshielded first, as a baseline. For an unshielded 6core 28 AWG cable, with cores twisted together in a standard untwisted or slightly twisted bundle (the kind you'll find in basic consumer or low-end industrial cables), the total inductance runs between 0.4 and 0.6 µH per meter. That number jumps a bit if the cores are tightly twisted: twist reduces the mutual inductance between adjacent cores, so a well-twisted 6core 28 AWG cable might clock in at 0.35 to 0.5 µH per meter.
Now, shielded 6core cables-this is where things get useful for most working professionals. A shield adds a conductive (usually metal) layer around all the cores, designed to block external EMI and also alter the cable's inductance. The type of shield makes a big difference here, too. For example, an Aluminum Foil Shielded Control Cable (think of this as a thin layer of aluminum wrapped around the core bundle, often with a drain wire for grounding) has a slightly higher inductance than an unshielded twisted cable, typically ranging from 0.5 to 0.7 µH per meter. The foil shield adds a small amount of parasitic inductance, and it also slightly increases the distance between the inner cores, which boosts mutual inductance a touch.
If you need even better noise performance, you might consider a cable with multiple shielding layers. Our Double Shielded Control Cable options, for instance, combine an inner foil shield and an outer braided copper shield, which is common for high-reliability industrial applications. A double-shielded 6core 28 AWG cable will have an inductance in the range of 0.6 to 0.8 µH per meter. That's a small jump, but for circuits running high-frequency signals (like 1 MHz or above), even a 0.1 µH difference can affect signal clarity, which is why choosing the right shield type is so important.
Wait a second-what about twisted pair configurations? A lot of 6core cables are actually made up of three separate twisted pairs, right? That's extremely common for control cables used in RS-485, CAN bus, or other serial communication systems. If your 6core 28 AWG cable is structured as three twisted pairs instead of six individual parallel cores, the inductance calculation changes again. Twisted pairs are designed to cancel out mutual inductance and EMI by twisting two wires tightly so that each wire is exposed to the same amount of external interference, and their opposing magnetic fields partially cancel each other. A 6core 28 AWG cable made of three twisted pairs will have a lower overall inductance than an untwisted 6core cable, usually around 0.3 to 0.45 µH per meter. That's one of the reasons this configuration is so popular for communication circuits-it minimizes inductive crosstalk between pairs, which is a huge pain point for engineers working with high-speed data.
I should also mention that these numbers are for typical operating conditions: room temperature, low current (below 1A, which is standard for 28 AWG wire), and frequencies up to 10 MHz. At higher frequencies, the skin effect comes into play-current doesn't flow evenly through the entire wire, it flows mostly along the outer surface-so inductance can shift slightly as frequency rises. For most low-voltage, low-frequency applications (like simple sensor triggers or basic control signals), that shift is negligible, but if you're working with high-frequency data, you'll want to check the manufacturer's specifications for frequency-dependent inductance.
Now, why does all this matter? Let's ground this in a real example. Suppose you're designing a small industrial control panel that uses a 6core 28 AWG cable to connect a proximity sensor to a PLC. The sensor outputs a 24V DC signal at 1 kHz, and the control panel has a 5V power line running next to your signal cable. If you use an unshielded 6core cable with an inductance of 0.5 µH/m, you might see enough inductive coupling between the power and signal lines to cause a tiny voltage spike in your signal-small enough to not cause a problem, but if you add a few more sensors or run the cable through a more noisy environment, that spike could turn into a false trigger. If you swap to an Aluminum Foil Shielded Control Cable with similar core count and gauge, the shield blocks most of that coupling, and the inductance goes up by just 0.1 µH/m-hardly enough to affect your circuit's performance, but enough to eliminate the noise.
Another example: if you're running a CAN bus network over a 6core 28 AWG cable, which requires two twisted pairs for the differential signal, and the remaining two cores for power and ground. Using a triple-twisted 6core configuration will lower mutual inductance between the CAN lines, which reduces crosstalk and lets the network run at the maximum 1 Mbps speed most standard CAN systems support. For this application, a 6core 28 AWG cable built like the 8-core Flexible Twisted Pair Shielded Cable (adjusted for 6 cores) would be ideal-its twisted pair structure cuts down on inductive crosstalk, and the shield keeps external noise out.
Wait, let's circle back to the cable configurations available from our product line, since I know a lot of readers will be shopping for these cables right now. We stock a range of multicore shielded cables perfect for 6core 28 AWG applications, tailored to different use cases. If you need a basic, cost-effective option for low-noise environments, our RVVSP Twisted Pair Shielded Cable is a great choice-it's built with tightly twisted pairs to minimize inductive crosstalk, and the foil shield provides enough EMI protection for most commercial and light industrial jobs. For harsher environments, where there's more nearby electrical equipment, our Multicore Shielded Copper Cable line offers double-shielded options that handle higher EMI and have the slightly higher inductance you might need for long cable runs.
One common mistake I see buyers make is assuming all 6core 28 AWG cables are interchangeable when it comes to inductance. That's not true-core twist, shield type, and core arrangement all change the inductance value, which in turn changes how the cable performs in your circuit. A customer of mine last year ordered a bulk 6core 28 AWG cable that was unshielded and untwisted, thinking it would work for their CAN bus system, and ended up with intermittent signal dropouts because the high mutual inductance caused crosstalk between the pairs. When they swapped to our RVVSP Twisted Pair Shielded Cable, the twisted structure cut inductive coupling by nearly 30%, and their network worked perfectly at full speed. That's the kind of real-world impact that makes understanding inductance for your specific cable so important.
If you're doing a custom design, or you have a special application that needs precise inductance values, we can help you spec out the right cable. For example, if you need an ultra-low inductance 6core 28 AWG cable for high-frequency RF applications, we can adjust the core twist rate and shield type to get the exact inductance range you need, whether that's 0.3 µH/m for a low-noise data line or 0.8 µH/m for a power connection that needs to resist voltage spikes. We also work with engineers to test custom configurations if standard off-the-shelf options don't fit your needs.
It's worth noting that inductance calculations for multicore cables aren't just theoretical-manufacturers test them using impedance analyzers, which measure the inductance, capacitance, and resistance of the cable at specific frequencies. For any 6core 28 AWG cable you buy, you should look for a specification sheet that lists inductance per meter (or per foot, depending on your region) to make sure it fits your design. A lot of budget cables don't publish these specs, which is why working with a reputable supplier pays off-you get accurate, tested data, not just generic estimates.
So, to wrap this up: the inductance of a standard 6core 28 AWG cable depends almost entirely on its construction. Unshielded, untwisted versions will have 0.4 to 0.6 µH/m, while shielded versions range from 0.5 to 0.8 µH/m. The key factors are core twist (to reduce mutual inductance), shield type (foil vs. double shield, which add small amounts of parasitic inductance), and whether the cores are arranged as twisted pairs for communication applications. For most industrial and low-voltage uses, a well-designed 6core 28 AWG cable will have an inductance between 0.35 and 0.7 µH/m, which is more than sufficient for 90% of common circuit needs.
If you're currently selecting a 6core 28 AWG cable for your project, or you have questions about how inductance impacts your specific application, we're here to help. Our team of engineers has decades of experience working with control cables for industrial automation, sensor networks, and custom electronics, and we can help you choose the right configuration, whether you need a basic foil-shielded option or a high-performance double-shielded cable for harsh environments. Don't guess on cable specs-get the right inductance and performance for your design, and reach out to our team to discuss your requirements today.
References
- Paul, C. R. (2006). Introduction to Electromagnetic Compatibility (2nd ed.). John Wiley & Sons.
- International Electrotechnical Commission (IEC). 60227: Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V.
- Owens, C. D. (2013). Electronic Materials, Processes, Devices, and Packaging. CRC Press.
- Belden Inc. (2022). Multicore Cable Design and Specification Guide.