I was called out to change all the breakers in a 100A residental panel. The panel wasn't marked in any way to ID it. The existing breakers were a mish-mash of various old breaker types. As best I could tell I thought it may be a murry type?? The inspector came out (young guy) and said I had to prove those were the right type of breakers for the panel and to "find it" on the internet. Sheesh@!!