Wow What a beauty. Never seen one like this. For you to run into this on your first few mock inspections is a great learning experience.
My thoughts: (Im sure Paul Abernathy will spank me with his vastly superior knowledge)
You go by the lowest rated point, if it is a 200 A panel, but 100 A feed wire, it is 100 A. If there are 2 100 A main fuses (one per lag) I would call this a 200 A panel.
As for replacing, I would recommend updating based on age and useful life. If it was put in in the early 60’s, it is 50 years old. My issue with Fuse panels is the Human element: I always find 20-30 amp fuses where a 15 amp belongs, circumventing the safety measures.
Post script Please put your location in your profile, thanks.
How do we know that from the information that Donald provided? He said that he has a 100 amp and a 60 amp plug-in fuse component. Do we know that the 100 amp is feeding the 60 amp? To me it sounds like he has a 100 amp and a 60 amp.
From the additional photo’s it looks to me like the panel has no main and 6 pull out overcurrent protection devices. Five on the top for various loads and the sixth one feeding the fuse portion on the bottom.
Very interesting older panel. Lucky to encounter one like that on one of your first inspections (even if it didn’t seem like it at the time). This is worth like 20 plain old mundane service panels as far as what you can learn from it.:mrgreen:
Michael - You’re under arrest for breaking Watts Law