For what the OP is doing, I really doubt that strand count would have any negative effect one way or another. It is more important to have the right gauge of cable for the amps/length that the cable is used for. In my application, I have to run a 0/1 gauge cable from the 200 amp alternator to the high amp cut-off solenoid in the trunk of the car 15 feet away. I never considered wire strand count when buying the bulk cable. It is highly unlikely that my car will burst into flames because the strand/wire count is not "correct". Hell I don't even know what the "correct" strand/wire count should be.
The entire reason for the strand count comment was to be sure he got the biggest cable that was the most flexible, while at the same time, being clad in a PVC vinyl overwrap that was rated for exposure to battery acid, oil, gasoline,brake fluid, road salt/grime and a certain amount of heat. Unless you gotta really grimy, oily, 212 degree hot assed garage,...WELDING CABLE clad in some form of rubber sleeve was never intended for that exposure.
So in the end, I don't know whether it has more or less strands than the Advance auto parts bulk cable I was recommending;
My point about strand count ( over simplified for those still in diapers)
Lets take pencils and toothpicks as an example here.
In a tube 1" in diameter,........... jam as many pencils as you can get into it.
Now jam another 1" tube full of tooth picks.
Now take into consideration how much air gap there is between the pencils........then between the toothpicks.
Now using our imaginations,.
...imagine the wood was actually copper. How much more current would actually course through the toothpick sized copper conductors as a result of there actually being more copper in the 1" tube than in the one filled with pencil sized conductors, and..............................
All that air.......
Between the pencils...........
Not moving one,......single,.........electron.
How can that be? They're both the same size cables.
That's all I'm sayin.