The term Conceptual Analysis has a storied history in philosophy, in particular in the 20th Century. I argue here for a specific application to electrotechnical terminology, ConcAn. I suggest the necessity for ConcAn by considering a contemporary example from the IEC.I then elucidate some principles of, and illustrate, ConcAn by means of a running example, the notion of reliability. There are likely important principles still to discover.