You have 2, size 8 Solar cable/wires, one is 7 strand and the other is 50+ strands,both are copper material, both are identical (except for the strand count), would the resistance be the same for each cable/wire?
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It should be the same because the wires are supposed to have equal copper cross-sections. There are some differences, however, with different wire types: AWG wire is thicker than SAE wire of the same gauge, and welding wire is generally thicker than non-welding wire. But in the same wire class, any wire of the same gauge is supposed to have the same copper cross section, and therefore the same DC resistance.
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In extremely high frequency applications the finer stranding will carry more.
Go with high quality AWG wire with really thick insulation. SEAL THE ENDS with meltable inner liner heat shrink tubing to prevent O2 from migrating into the cable and oxidizing the copper strands.
Yep, the resistance is different, but probably negligible.
As the stranding goes up, the resistance goes up.
The effect is very small, like 0.014 ohms per 1000 ft., but it is there.
This can be measured, but you would need a DLRO (Digital Low Resistance Ohmmeter) to do it. It measures micro-ohms. 1 micro-ohm = 0.000001ohm. Your average test meter in your house is not going to measure that.
Also, there is differences in resistance from different manufacturers of wire. If you know the manufacturer of both pieces, you could probably look up the specs on the wire and find the ohms per 1000ft. rating.
* This post was
edited 04/13/12 03:29am by randrx2 *
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It shows, that depending on the exact stranding, the resistance of the stranded wire may be more or less than the same gauge solid wire, but is always very close. The biggest size on the table is unfortunately 14 gauge. I assume the same principle would hold for larger wires.
What randrx2 said. How are you going to measure the differance. But more importantly why do you want to? More surface area, lower resistance Skin effect, they say the current runs on the outside of the wire, not thru it. Concernd? get a bigger wire.
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