Some yards use #1-3 for grading copper which I think is kinda hard to get used to. the way we grade copper at my yard is 80% which is mostly MCM(big power cables), THHN, and romex after it got the outer insulation removed. Then its like 70% which is romex and well pump wire mostly. Then 50% #1 which is like ethernet cables and such. Then its 40 and 50% #2. 40% is like extension cords and pretty much everything else. 50% is the old style house wiring and power cables and what not. Then we got battery cable and Wire harness (Auto Loom) which are their own things because we do enough cars and run enough engines through the hammer mill that it makes it worth it to separate most yards probably don't. It sounds like you have mostly low grade, (40% #2) or #3 at the yards that grade like that. But I could be wrong.

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