I encountered an outdoor electric panel and wondered if this is allowed by code. It is exposed to the weather and has a missing breaker or slot cover.
Here in AZ, exterior mounted panels are the norm and not the exception.
An unfilled opening in the deadfront is worthy of a write up
Being that you’re a home inspector:
you should no we don’t inspect to code. Also that any opening (missing breaker or slot cover) in a service panel is a safety hazard.
If you don’t I feel for your past clients.
I don’t know about code but I do know that there are service panels that are designed for the exterior. Usually there is a meter attached to them here. The door often covers the whole front. If your a Home Inspector join NACHI.
If you have an exterior panel enclosure (NEC Article 312) it is required in accordance with Section 110.28; this section defines the type of NEMA rating that must be used on exterior rated panel enclosures.