When it comes to the complex world of electrical wiring, the word “stranded wire” frequently appears. Its design not only increases its versatility but also makes it more adaptable to a range of applications.
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However, the distinctive characteristics of stranded cables are not limited to flexibility; they also include a number of unique benefits. This blog article is here to detangle the complexities of stranded wire and its various uses so you can make informed decisions about your electrical needs.
Stranded wire or cable consists of several thin, bundled wires that are insulated with non-conductive materials. Its flexibility makes it perfect for connecting electronic components in tight spaces or for shaping them to fit complex designs.
When it comes to stranded cable, there are a few key types that you should know about:
Stranded wire is highly flexible, making it easier to deal with in a variety of applications. This adaptability enables simpler installation in confined places and complicated layouts.
Stranded cable has a longer lifespan and performs more consistently than solid wire due to its structure. It can tolerate bending and twisting better.
Stranded cables may carry more current than solid wires. Its many wire strands improve the overall surface area, resulting in more efficient power flow.
Stranded wire substantially lowers the skin effect, a phenomenon in which high-frequency AC currents pass over the surface of conductors.
Stranded wire can be more prone to corrosion, reducing its durability and performance over time.
Stranded wire is often more expensive than solid wire. So, it might have a negative impact on your budget.
This type of wire may encounter increased voltage drop, perhaps resulting in decreased efficiency in your electrical systems.
In conclusion, understanding the nuances of stranded wire can significantly enhance your electrical projects, allowing for flexibility, durability, and superior performance in a range of applications. While stranded cable offers these advantages, being aware of its disadvantages helps you make an informed decision.
So, are you ready to elevate your electrical wiring game? Explore your options today and enjoy the flexibility and reliability that stranded wire brings to your work!
Solid wire consists of a single strand of metal. Its compact structure allows it to carry strong currents efficiently. This type of wire is ideal for applications where flexibility isn’t required. It is a reliable choice for fixed installations.
Whenever the topic of solid vs stranded wire comes up, it is noted that stranded wire is more flexible than its solid counterpart and won’t break or split easily. This is because stranded cables are made from multiple smaller strands twisted together, offering greater flexibility and durability, making them suitable for dynamic or movable setups.
Therefore, it is commonly used indoors for applications like electronic devices, circuit boards, and speaker wires. On the other hand, solid wires consist of a single, thick conductor and are ideal for stationary applications where minimal flexibility is needed.
While solid wire provides better conductivity over longer distances without signal loss, stranded wire excels in environments requiring bending or twisting. Ultimately, the choice between them depends on your specific application needs—whether you prioritize stability or adaptability in your wiring solutions.
Stranded cable isn’t commonly used in homes because solid wire offers better resistance to corrosion. With fewer connections, there’s less chance for deterioration over time. This makes solid wiring a more reliable choice for residential electrical systems.
In electromagnetism, the skin effect defines how alternating current (AC) behaves in a conductor. Instead of flowing equally throughout, the current concentrates at the surface and diminishes dramatically as it descends.
This phenomenon occurs as a result of opposing eddy currents created by changes in the magnetic field produced by AC. Essentially, the majority of the electrical flow happens at or near the outer layer, up to a particular depth called skin depth.
Ampacity refers to the maximum electric current, measured in amperes that a conductor can safely carry on a continuous basis without surpassing its temperature limits. This concept is outlined by the National Electrical Codes in the United States and helps ensure safe electrical installations.
Understanding ampacity is crucial for selecting appropriate wiring to prevent overheating and maintain optimal performance under various usage conditions.
Wires are arguably the most typical items in electrical equipment (wire harnesses and cable assemblies) and devices. But these wires are not the same. Upon close inspection, you will find that some have a single solid core while others have several thin wires. These are solid and stranded types of wires. In this article, we will compare stranded vs. solid wire to learn more about the properties of the two. Take a look!
Stranded wires are cables consisting of multiple tiny gauge wires compressed, twisted, and insulated together to create organized bundles.
A stranded electrical power cable
Making stranded wire involves drawing and annealing individual strands first. After that, a machine twists several strands around a center wire. These individual wire strands can be 30 or 34 AWG (American Wire Gauge) in size. The stranded wire can have seven or more of these thin pieces. And the flexibility of the resulting stranded wire increases as the number of wire strands increases.
Stranded wire twisting falls into the following four categories.
This stranding technique twists the strands of wire in one direction without considering their arrangement geometrically.
Concentric stranding lays at least one helix-laid wire layer around a solid core wire. Each of these layers contains six or more single strands of wire than the previous one. Additionally, each layer runs opposite to the direction of the preceding layer unless it is the compact version of concentric stranding.
copper wires
This stranding resembles the concentric type but with two differences. The lay direction and length are the same in the layers.
This stranding is similar to concentric stranding but with the component strands individually stranded. Also, the group count forming the rope and the strand count in every group define the rope-lay type of stranded conductor.
Stranded wires have the flexibility advantage compared to solid wires of a similar size. And this factor determines the cable's applications. The wires are ideal for situations requiring frequent movement, flexing, or vibrations, such as on a robot arm.
Stranded copper wires
The cables are also suitable for routing through confined spaces where you need intricacy. These include in-patch cabling, headphone cables, and appliance cables.
An IEC standard electrical power cable with three-stranded wires (live, earth, and neutral)
Solid wires are electric cables consisting of single solid conductive cores. The solid conductor is heavier and thicker than its stranded wire counterpart. Also, it is resistant to extreme environmental conditions, weather, and frequent movement.
Two solid wires
The process involves drawing copper rods using a set of small dies that gradually become smaller until you get the required wire gauge. These rods become thinner and more brittle the more they get stretched.
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So they undergo an annealing process (heating) to make the copper wire ductile and sturdier. After annealing is insulation, then the wire is ready to use.
This rugged, low-cost wire has the durability advantage because it is anti-corrosive. Therefore, it is ideal for outdoor applications. Additionally, it has a high current capacity and can withstand frequent movement.
Besides that, the wire is suitable for the following applications.
Solid copper wires in twisted pair
These signal/power cables have unique advantages that make them suitable for different applications. Here's a head-to-head comparison that shows how each wire fairs.
Solid vs. stranded wire
Electricity causes a skin effect when it goes through wires. The parts closer to the exterior layer are more exposed to electromagnetic fields, resulting in electricity losses in the air.
A solid wire is thicker than the stranded type, so its surface area for current dissipation is smaller. The thinner wires in stranded cables contain air spaces and a larger surface area that increases dissipation. Therefore, these cables have a lower current carrying capacity.
On top of that, thinner strands (with a high gauge of wire) have higher insertion losses than thicker wires. Therefore, stranded wires experience between 20% and 50% more attenuation than similar gauge solid cables. The DC resistance is also higher because the stranded cable's surface area is not all solid copper.
Two factors affect a wire’s resistance: its cross section/diameter and length. Let’s begin with the stranded wire’s structure. The individual copper strands don’t run straight from one end to the other. Instead, they run in a spiral pattern, which makes the conduction path longer than what you see on the skin.
This longer design increases the wire’s resistance compared to the straight solid wire.
When considering the diameter, stranded wires have air gaps between the strands, meaning that a 6-gauge stranded wire has a smaller conduction cross-section than a 6-gauge solid wire.
This reduced conduction surface also increases a stranded wire’s resistance.
However, these phenomena only apply to DC power transmission. When transmitting AC at high frequencies, the skin effect places the odds in favor of stranded wires because the current tends to crowd at the surface of the conduction path.
AC high-voltage power transmission lines
Since stranded wires have more surface area than their solid wires, they provide more real estate for current transmission to the other end.
Therefore, the resistance between the two wires also depends on the type of power you’re transmitting.
Stranded wires are more flexible, making them more bendable and ideal for routing. Therefore, it is easier to maneuver them around objects than their solid counterparts.
Stranded wires packaged together.
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Solid wire cables are stronger and more rigid, but flexibility is not their forte. So applications requiring frequent flexing and vibrating are better for stranded wires.
Solid copper conductors are cheaper to manufacture because the process requires a few steps and is faster. Manufacturers only need to draw, anneal, then insulate the cable.
Making stranded cables follows the same process, but there is the additional step of twisting the individual strands to create the final product. This extra process increases manufacturing costs.
Manufacturing a single wire is not only cheaper, but it is easier. So making solid wires is simpler than manufacturing multiple tiny high-gauge copper wires, then twisting them together.
Solid copper is sturdier and more rugged than several thin cables put together. Additionally, the wire is thicker, heavier, and weather-resistant. Stranded wires have air gaps that increase the surface area for corrosion when exposed to the elements.
Stranded copper wire. Note the air spaces between the strands.
Solid wire cables dissipate less current. So they can transmit more power along lengthy lines. These wires are also better for signal lines because they have lower attenuation.
And there is another factor to consider. Wiring requires electricians to pull cables through long conduits in buildings. Solid wires can withstand the tension without snapping.
No wire is better than the other when you compare the two. Each has unique advantages that make it suitable for specific applications. Once you determine the ideal wire for the job, the next crucial factor is to pick the precise wire gauge.
Several factors come into play here.
When transmitting DC power, such as from solar panels to batteries and from batteries to the inverter for conversion to AC, solid core wires are better because they have a lower resistance for the same gauge and length.
But when handling AC in a building’s wiring system or the grid, stranded cables are more efficient. Stranded wires are more flexible than their solid core counterparts, meaning they will last longer when you have to bend them every time (non-fixed installation).
For instance, electrical appliances and charges must have stranded wires to withstand constant movement and flexing during use.
An iPhone charge (note the coiled cable)
And on durability, solid core wires have a smaller surface area for corrosion. So, they will last longer if installed in an area exposed to the elements, and they don’t have outer insulation.
In a nutshell, you have to look at the advantages and disadvantages of each wire to that specific application.
For instance, while solid wires have a lower surface area for corrosion in outdoor applications, the skin effect is weightier when considering AC transmission. This explains why AC power lines are stranded wires.
You can replace solid wire with stranded wire, especially if the skin effect has a significant impact on current transmission.
However, the replacement stranded cable should have similar or higher electrical ratings (amperes and voltages) than the solid type. If these values are lower ratings, the wire will get hot because of the increased resistance.
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