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14 gauge wire is smaller and is only good for 15amps of load. 12 gauge wire is a little bigger and is good for 20 amps of load, that is best case. there are many other factors that apply such as length of wire run, how long the power is applied, how many conductors are parrellel to each other etc.

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Q: What is the difference between 12 2 and 14 2 wire?
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