I have added a sub panel to the main so that I can increase the number of circuits. To do this I had to move two of the existing breakers to the sub panel. This was done so I could install a 60 amp double breaker to feed the sub panel. The existing wires leading into the main panel were too short to reach the sub panel. I extended them using twist-on connectors in the main panel. This works OK and all outlets have correct polarities, etc.
My question. Is this an acceptable method of extending the length of existing circuit wires? If not, how should this be done?
Many thanks.
Peter.