Cool that you made your own cables! Certainly not going to stumble across CAN cabling at Home Depot.
At the risk of de-railing this thread, and boring you all to sleep on a Saturday night, I have a lot of spare cabling within 10 feet of me, so...
This is a simple 2 conductor CAN cable with shield and a standard Ethernet cable above it for comparison. It's a pair of 22 ga wires and we get this from LAPP Kable (Germany). By spec, CAN cabling has unusually thick insulation. The OD of each CAN wire in this photo is ~ 0.080" compared to the 0.038" of the Cat5e. Some of that is the Ethernet wire is a bit smaller (24 ga), but the insulation is really the biggest difference in size.
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Here is a pic of another type of CAN cable that contains a pair of 16 ga (Red / Blk) conductors used to carry (typically) 24 VDC Logic Power to fieldbus devices. The Blue and White wires are CAN and the small bare wire is the shield drain. In this picture you can also see some different sized molded 5 pin connectors, these were made for us by Turck.
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Lastly, I tried to get a picture to illustrate the difference between insulation thickness. The Red wire is for 16 ga DC Power and the Blue wire is a much smaller 22 ga but with so much more insulation it ends up bigger than the #16.
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These large wire thicknesses are one of the reasons I dislike the RJ45 CAN connector, that Blue wire will never fit into a standard RJ45 slot, they are designed for much smaller conductors. It's even sometimes a problem to find a good ferrule or pin to crimp onto wires like this, because the copper wire inside (#22) is so small compared to the OD of the wire plus insulation. They make some really interesting cables nowadays to solve problems like this that have 2 layers of insulation around the copper wire, the inner insulation is smaller and there is a larger (some type of foamed fluoropolymer) used to make a second outer layer that can be removed separately at termination points.
I've never seen that special cable in person and it's also not in any Home Depot aisle