Splicing #14 wire, hot to neutral ratios....

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wrote:

If there's even an inch of #14, old or new, anywhere in the circuit, then that circuit needs to be protected with a 15A breaker or fuse, and there is essentially zero advantage to splicing in any #12, unless it's all you have and the stores are closed. Possible exception is if it's a very very long run, like to an outbuilding, in which case you maybe need to use #12 or heavier with 15A protection.

If it's #12 that's visible leaving the panel, then there's a danger that someone will assume the whole circuit is #12 and thus they might put in a 20A fuse. So if your new wire is going to go into the panel, then there's a very good reason to make it the same was what's already in the rest of the circuit.
(Besides, some will tell you that old wire is HEAVIER than new stuff of the same nominal gauge. No matter. Old #12 or new #12 should ok with 20A, unless it's damaged, in which case it shouldn't be used at all.)

You got to tell us what the heck is going on here.
Chip C
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I don't know either, but it doesn't sound like whatever is going on is good.
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