Hi Jerry,
Hope you are well. At a recent inspection I called out a plug-in-type main breaker backfeeding a main panel with no retainer clip (picture in attachment). The service person (plumbing, heating, air and electrical) wrote this in his report and I have no idea what he is talking about.
"The 100 amp breaker does not need a retaining clip, because it is loaded out to the 80%/125% rule per the NEC."
Could you help to clarify this. Thank you!!