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what has happened is the electrician was rushed to move the wires with limited access beneath so they channeled behind the baseboard to the new location.
you could technically use #14awg but i will bet money the circuit is on a 20A circuit breaker so you have to use 12awg.
the tic tracer (beeper) may not have worked because the 2 legs canceled each other out, try to separate the wires and test again.
the way to fix this is to get a single gang plastic old work box, cut it into the wall and a single gang blank cover, turn off the circuit breaker, pull the wires up into the box and re-run the wire at size 12. make sure to put nail plates over top of the wire if you use the same path, make up a new junction at both ends.
if the existing breaker is 30A, change the breaker to manufactures specs.
you only need to use two wire (three conductor) black/white/ground because the heater doesn't need a neutral
hope this helps
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Chris
the more i learn, the less i know
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