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Recently, we have had some time to work on our new house (1990s home) and I found a very interesting thing.

On a 20amp circuit breaker the wiring looks to be 14ga.... from what I have read and understand this is a huge problem and all wiring should be 12ga

Since understanding that 20amp breakers are to be ran on 12ga wire I have installed 8 recessed led lights using the 12ga wire and spliced into the 14ga. only one wire was spliced to fit 6 lights and one wire to splice 2 in the dinning room.

My question is this, is my house at risk with the two gauges mismatched and if using a 20amp breaker, but all the wire is 14ga, would I need to replace all wiring?

Thank you for your time,
 

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Okay but what about the splicing of 12/2 to already wired 14/2?

How dangerous is this and it's obviously a code violation correct?
IMO it is not really "dangerous", but it IS a violation that could potentially be dangerous, and should be remedied.

If this is just for lighting change the breaker to 15 and be done with it.
 
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Okay but what about the splicing of 12/2 to already wired 14/2?

How dangerous is this and it's obviously a code violation correct?
What do you mean "splicing"? All connections must be made inside an electrical box.

I suggest you engage an electrician before you rely or pick advice from those who never saw your house for code violations.
 
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