Older home that’s been most re-wired. 100 amp service to the main with 60 amp feeder to the sub just to the left of it (see pic). Only 3 wires - 2 hot and 1 neutral feeding the sub.
The sub had isolated grounds and neutrals on separate buses.
The sub ground bus was grounded through a grounding electrode to a grounding rod outside of the house instead of back to the main panel.
Is this considered okay?
I’m thinking not.
Also every circuit in the sub was overfused.