Allan;
Well, I happen to understand the 10/3 part, at least.
Thats a cable that has 3] #10 insulated conductors in one sheath. Often with a bare ground of #10 in the bundle.
Very common for feeding 240 volt circuits here. Stuff like pumps, welders and electric water heaters.
Tom
"Education consists mainly of what we have unlearned."--Mark Twain
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