I have an industrial control panel built in 2004/05 and it was built by a qualified electrician (but a non UL shop). We used the panel for a system and put it in storage and want to reuse the panel again for the same type of system (i.e. same controls, pumps, etc.). Can this panel be reused if it was not initially certified per the subject articles. Is
there an article in the NEC that grandfathers these old panels? Would it matter if a couple of mods were made to the system since 2005 – please note that the panel has been completely functionally tested for all operations/controls.