Solid vs. Stranded Ethernet Cable
Written by Don Schultz, trueCABLE Technical Manager, BICSI INST1, INSTC, INSTF, Fluke Networks CCTT
So, here you are with your brand-new shiny tools and Ethernet cable and want to start installing it. You made sure to purchase thousands of feet of ultra-high-quality stranded copper cable and have every intention of running it to 800 feet. What could go wrong? If you hear the train getting into a wreck outside your window, that is exactly what you will hear when you go through the pains of installing the wrong cable type and expecting it to work properly. Take back the bulk stranded copper stuff. You need solid copper conductors for structured cable (also called permalink).
What is the difference between solid vs. stranded ethernet cable? Doesn’t copper = copper? Yes and no. Yes, copper is good. CCA or Copper Clad Aluminum is bad, which this article explains: Check Your Specs, CCA is Different from Solid Copper.
Using the correct type of copper conductor is key when installing Ethernet cable. It does not matter what Category type of cable for purposes of this discussion. Copper comes in solid or stranded, and both have pros and cons.
How does each solid vs. stranded ethernet cable conductor type look inside an Ethernet cable?
Solid copper pros:
- Allows Ethernet data signals to travel further along a cable with less signal loss. Signal loss is called attenuation.
- Provides a much better platform for use of Power over Ethernet (PoE)
- Works far better with traditional punch down applications
- Solid copper conductors are more durable and tough...great for outdoor installations
- Solid copper conductor Ethernet cable is typically sold in the variety needed for in-wall or plenum (HVAC) space installations, and for outdoor scenarios. The outer jacket type matters a great deal, which is addressed here: Facts About Ethernet Cable Jacket Ratings.
Solid copper cons:
- The solid copper conductors are less flexible. This means solid copper Ethernet cable is designed for installation in spots where the cable is not going to be stressed by handling.
- Cable sold in bulk (spool or box) will require the installer to terminate both ends, whether to a keystone jack, patch panel, or RJ45 plug.
Stranded copper Ethernet cables have their place too. In a pinch they are great for connecting two pieces of equipment together temporarily. Stranded copper Ethernet cables, when sold as patch cables, will have RJ45 connector plugs on both ends.
Stranded copper pros:
- Flexibility. Stranded copper patch cables are the preferred and accepted way to connect a device inside a room to a keystone jack, for example. The cable might get handled frequently and the copper strands are able to withstand frequent bending.
Stranded copper cons:
- The stranded copper conductors have small air gaps between the individual copper strands, which causes signal degradation over distance. Those small air gaps don’t transmit signals very well or at all. Although there are on-going debates about this, I personally don’t recommend the use of stranded copper Ethernet cables longer than 75 feet.
- Stranded copper conductors, again due to having individual copper strands, causes additional DC resistance for PoE applications especially over distance. Air is an insulator when it comes to electricity. In this scenario, it is especially important to not exceed my 75 foot recommendation for length.
- Often stranded copper Ethernet cable does not come in the cable jacket variety needed to address certain applications, such as outdoor runs or into the plenum space.
Here is an installation graphic that will help distill solid vs. stranded ethernet cables:
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