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I have built a detached garage which will have a 125A subpanel. (125A panel because it will double as a work shop with A/C and heat and power equipment). Power will brought in from the house load meter panel which only has 12 spaces which are all taken. In fact, several spaces are occupied by tandem breakers to carrying 220V circuits requiring the second hot leg to be carried by another tandem breaker with a space in between in order to pick up the other side of the bus. (I think this is illegal or should be. This is the way the panel was wired when we purchased it).
With the second panel installed adjacent to the meter base, I plan to get rid of all tandem breakers (which I do not like anyway) and move several breakers to the new panel which has 24 spaces, freeing up spaces in the meter base panel where I will install the 125A breaker to power the subpanel in my detached garage.
Moving these circuits to the new panel will require splicing wires in order to reach the new panel breakers. My question is: Does NEC code allow for splices inside the circuit breaker panel? Are there special type splices needed for this situation or are wire nuts allowed? All splices will be done correctly and taped. A master electrician and electrical engineer have said it is legal but a NEC reference, page and paragraph, would be helpful incase my inspector objects.
Thanks in advance for your response. Don