This question is about whether "circuits" can be grandfathered if the breaker or panel is changed but the circuit is otherwise not disturbed.
Code is NEC 2017. My existing main panel has plenty of ampacity but few spaces, and thus, is totally full. I have several potential paths for an upgrade.
One involves fitting a subpanel and moving 4 circuits (2 double-stuff breakers) there, and adding circuits there.
The other involves outright replacing the main with a very fine 60 space main panel. No more space problems!
But what happens with AFCI and GFCI requirements? If this were a new house, nearly all my circuits would require it, but I am grandfathered. Will the "new main" scenario void the grandfathering and require that nearly all circuits be upgraded to that protection? Or can I just move over my old breakers and call it good?
Best Answer
With the NEC straight up I think 210.12.D. Would require AFCI's where required (when the branch is modified, replaced or extended) the only exception is if the conductors are extended less than 6 feet with no new devices. Note I just checked with a inspector I worked with in my last county, he said 6' on either end with no new devices in our state would not require all the new code, I always read this as an extension to the end of line for a remodel with the total devices the same so even in my state and county there are some options.