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[TCML] Dumb Ballast Question

Dear List,
I have a question regarding ballast for a 14.4kV distribution transformer. 

Last time I set one of these up, I used a 500-foot roll of 12 gauge solid wire as ballast. That worked great. 

I no longer have that roll of wire, but I do have a 250-foot roll of 12-gauge stranded two-conductor speaker wire. 

My question is this: Can I leave the wire on the roll as it is and connect the two conductors together at the end of the roll, essentially creating a single conductor roll of 500 feet. Or should I unroll all of the wire and separate it into two 250-foot single conductors, connect them together, and then re-roll what would then be a 500-foot single conductor wire. 

I ask because I am afraid that if I just leave the wire on the roll and connect the two ends I'll have lots of eddy currents and heating issues when using it as the ballast.
Thanks,Dan K.
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