One of my suppliers sells copper clad aluminum CAT5 cable which may not
be as workable as all copper. It's possible that you got a similar wire
which costs less than the all copper conductor cable. Back in the 1970's
I worked in the electrical supply business when aluminum ROMEX
appeared on the market and some manufacturers developed copper clad
aluminum ROMEX as a safer wire to use which didn't require special
connectors. I remember getting in a roll of copper clad thermostat
cable and it was so light, I thought something was wrong. I stripped
some of the wire scraped it with a knife and saw the aluminum core.
Needless to say, some of the salesmen were freaked out about it. You
can scrape the wire to see if it has an aluminum core which could
explain you trouble using it. o_O
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