First of all the white wire is not a ground. What are you using for
ground? Is this in conduit?
Second of all, as mentioned, if one wire loses contact then its sister
wire is now overloaded.
Third of all if someone does future work from that box they may likely
just use only one of the 14ga leads, or branch off with only a single
If one wire were to be accidentally cut or disconnected, the other would
then carry the entire load. That's why doing what you suggest violates
code. Even if you run 100 pairs, each one is required to be large enough
to carry the entire load.
Also, connecting two wires to one terminal of a breaker also violates code,
and for good reason.
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