(Bold added by me)
Originally Posted by K8MHZ
Why? Other than a possibility of inadequate available fault current withstand capability, if it's working and has no signs of overheating, leave it alone!
I service a movie theatre with Frank Adams gear that is over 70 years old and it still works fine.
And we all know there is NOT ONE brand of modern breaker or gear out there that will STILL be functional 70+ years from now..
358.30, 230.70 and MWBC are officially hot button issues in my little world.